Table Of Contents
Verifying IPv4 Multicast Forwarding Using the MFIB
Prerequisites for Verifying IPv4 Multicast Forwarding Using the MFIB
Restrictions for Verifying IPv4 Multicast Forwarding Using the MFIB
Information About Verifying IPv4 Multicast Forwarding Using the MFIB
Guidelines for Verifying IPv4 Multicast Forwarding Using the MFIB
Common Commands for Verifying IPv4 Multicast Forwarding Using the MFIB
How to Verify IPv4 Multicast Forwarding Using the MFIB
Verifying IPv4 Multicast Forwarding Using the MFIB (PIM-SM, PIM-SSM, and Bidir-PIM)
Verifying PIM Tunnel Interfaces (PIM-SM)
Configuration Examples for Verifying IPv4 Multicast Forwarding Using the MFIB
Verifying IPv4 Multicast Forwarding Using the MFIB for PIM-SM: Examples
Active Sources and Interested Receivers (SPT Switchover): PIM-SM Example
Active Sources and Interested Receivers (SPT Threshold Set to Infinity): PIM-SM Example
Source Traffic Only with No Receivers: PIM-SM Example
Interested Receivers with No Active Sources: PIM-SM Example
Verifying IPv4 Multicast Forwarding Using the MFIB for PIM-SSM: Examples
Interested Receivers With or Without Active Sources: PIM-SSM Example
Source Traffic Only with No Active Receivers: PIM-SSM Example
Unwanted Sources in the SSM Network: PIM-SSM Example
Verifying IPv4 Multicast Forwarding Using the MFIB for Bidir-PIM Networks: Examples
Active Sources with Interested Receivers: Bidir-PIM Example
Active Sources with No Interested Receivers: Bidir-PIM Example
No Active Sources with Interested Receivers: Bidir-PIM Example
No Active Sources with No Interested Receivers: Bidir-PIM Example
Feature Information for Verifying IPv4 Multicast Forwarding Using the MFIB
Verifying IPv4 Multicast Forwarding Using the MFIB
First Published: October 2, 2009Last Updated: November 20, 2009This module describes how to verify IPv4 multicast forwarding using the Multicast Forwarding Information Base (MFIB) in multicast networks operating in Protocol Independent Multicast (PIM) sparse mode (PIM-SM), Source Specific Multicast (PIM-SSM) mode, or bidirectional PIM (bidir-PIM) mode.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Verifying IPv4 Multicast Forwarding Using the MFIB" section.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
•Prerequisites for Verifying IPv4 Multicast Forwarding Using the MFIB
•Restrictions for Verifying IPv4 Multicast Forwarding Using the MFIB
•Information About Verifying IPv4 Multicast Forwarding Using the MFIB
•How to Verify IPv4 Multicast Forwarding Using the MFIB
•Configuration Examples for Verifying IPv4 Multicast Forwarding Using the MFIB
Prerequisites for Verifying IPv4 Multicast Forwarding Using the MFIB
•Before performing the tasks in this module, you should be familiar with concepts described in the "Multicast Forwarding Information Base Overview" and "IP Multicast Technology Overview" modules.
•The tasks in this module assume that IP multicast has been enabled and that PIM-SM, PIM-SSM, or bidir-PIM have been configured using the relevant tasks described in the "Configuring Basic IP Multicast" module.
Restrictions for Verifying IPv4 Multicast Forwarding Using the MFIB
•You must be running a Cisco IOS image that supports the IPv4 MFIB infrastructure.
Information About Verifying IPv4 Multicast Forwarding Using the MFIB
Before verifying IPv4 multicast forwarding using the MFIB, you should understand the following concepts:
•Guidelines for Verifying IPv4 Multicast Forwarding Using the MFIB
•Common Commands for Verifying IPv4 Multicast Forwarding Using the MFIB
Guidelines for Verifying IPv4 Multicast Forwarding Using the MFIB
When you verify IPv4 multicast forwarding using the MFIB in PIM network environments, a useful approach is to begin the verification process on the last-hop designated router (DR), and then continue the verification process on the routers along the SPT for PIM-SM or PIM SSM (or on the shared tree for bidir-PIM) until the first-hop DR has been reached. The goal of the verification is to ensure that IP multicast traffic is being forwarded properly through an IP multicast network.
Common Commands for Verifying IPv4 Multicast Forwarding Using the MFIB
Table 1 describes the common commands used to verify multicast forwarding using the MFIB.
Common Mroute Flags
When you verify multicast forwarding, it is helpful to start by looking at the control plane using the show ip mroute command. Table 2 describes some of the common flags that you will observe in the output of the show ip mroute command when verifying multicast forwarding.
Common MRIB Flags
Whenyou verify multicast forwarding, it is helpful to confirm the communication between the control plane and the MFIB by examining the MRIB using the show ip mrib route command. Table 3 describes some of the common flags that you will encounter in the output of the show ip mrib route command when verifying multicast forwarding.
Table 3 Common MRIB Flags
Flag Description Entry FlagsC
Connected—When set, this flag should also appear in the MFIB. For more information, see the "C Flag" description in the "Common MFIB Flags" section.
IA
Inherited Accept—When set, this flag should also appear in the MFIB. For more information, see the "IA Flag" description in the "Common MFIB Flags" section.
Interface FlagsA
Accept—When set, this flag should also appear in the MFIB. For more information, see the "A Flag" description in the "Common MFIB Flags" section.
F
Forward—When set, this flag should also appear in the MFIB. For more information, see the "F Flag" description in the "Common MFIB Flags" section.
NS
Negate Signal—When set, this flag should also appear in the MFIB. For more information about this flag, see the "NS Flag" description in "Common MFIB Flags" section.
Common MFIB Flags
When you verify multicast forwarding, it is important to examine the MFIB using the show ip mfib command to ensure that multicast traffic is being forwarded as expected. This section describes some of the common flags that you will observe in the output of the show ip mfib command when verifying multicast forwarding.
C Flag
Table 4 describes the C flag.
C Flag Sample Output
The following is sample output from the show ip mfib command. In this example, the output has been filtered to display only entries that have the C flag set.
RP# show ip mfib | inc Flags: C
(*,224.0.0.0/4) Flags: C(*,239.1.1.1) Flags: C(*,224.0.1.39) Flags: C(*,224.0.1.40) Flags: CWell-Known Groups
(*, 224.0.0.0/4) Flags: C
This entry indicates that a directly connected check is being performed for the multicast range 224.0.0.0/4. The assumption is that this range is in the group-to-RP mapping cache. If it is not in the group-to-RP mapping cache, this entry will not appear. (*, G/m) parent entries, such as this entry, are used when a match for a (*, G) or (S, G) entry is not found. When traffic from a directly connected source matches a parent entry, the appropriate (*, G) and (S, G) entries in the MFIB, MRIB, and mroute tables will be created.
(*, 224.0.1.39) Flags: C
This entry indicates that a directly connected check is being performed for the Auto-RP Announce multicast group. When traffic from a directly connected source matches this entry and no corresponding (S, G) entry is found, the appropriate (S, G) entry will be created in the MFIB, MRIB, and mroute tables.
Note (*, 224.0.1.39) appears in routers that are configured as an RP for Auto-RP using the ip pim send-rp-announce command. The C flag will always be set for this entry, whether the multicast group is running in PIM-DM or PIM-SM.
(*, 224.0.1.40) Flags: C
This entry indicates that a directly connected check is being performed for the Auto-RP Discovery multicast group. When traffic from a directly connected source matches this entry and no corresponding (S, G) entry is found, the appropriate (S, G) entry will be created in the MFIB, MRIB, and mroute table.
Note (*, 224.0.1.40) appears on routers that are configured as a Mapping Agent using the ip pim send-rp-discovery command. The C flag will always be set for this entry, whether the multicast group is running in PIM-DM or PIM-SM.
Standard Multicast Group Entry
(*, 239.1.1.1) Flags: C
This entry indicates that a directly connected check is being performed for the multicast group 239.1.1.1.
Note 239.1.1.1 was arbitrarily chosen for this example to represent a standard multicast group entry in the show ip mfib output; in practice, the multicast group entries that will display in the output will depend upon your multicast network environment and application.
For this example, the (*, 224.0.0.0/4) entry will not be used because (*, 239.1.1.1) is more specific. When traffic from a directly connected source matches the (*, 239.1.1.1) entry and no (S, G) entry match is found, the MFIB will create the appropriate (S, G) entry then inform the multicast control plane to do the same in the mroute table. If the source is sending for the first time, the multicast control plane will then perform PIM registration or dense mode flooding based on the mode running for the multicast group.
K Flag
Table 5 describes the K flag.
Table 5 K Flag Description
Entry Flag DescriptionK
Keepalive—Set by PIM to indicate that the entry has been processed and should be stored in the MFIB.
IA Flag
Table 6 describes the IA flag.
IA Flag Sample Output
In the following output from the show ip mfib and show ip pim rp-mapping commands, the multicast group 239.195.1.1 is running bidir-PIM and there are two entries: (*, 239.195.1.1) and (*, 239.195.0.0/16). The (*, 239.195.1.1) entry indicates that there is an interested receiver in the network. The parent entry, (*, 239.195.0.0/16), indicates that there is a bidir-PIM group-to-RP mapping. The (*, 239.195.1.1) entry will be used for forwarding multicast traffic for the multicast group 239.195.1.1. The (*, 239.195.1.1) entry will also have the IA flag set, indicating it will inherit the following interfaces from its parent entry for performing accept checks: Serial interface 4/0, Serial interface 2/0, Ethernet interface 0/0, and Null interface 0.
Note The portions of output relevant to the IA flag are highlighed in bold.
Router# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: FPkts: 0/0Ethernet0/0 Flags: FPkts: 0/0Router# show ip mfib 239.195.0.0/16(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: A FPkts: 0/0Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ARouter# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 00:49:10, expires: 00:02:19A Flag
Table 7 describes the A flag.
A Flag Sample Output
Interfaces with the A flag set in the MFIB correspond to the incoming interfaces for their respective mroute entries, as shown in the following output for the multicast group 239.1.1.1:
Note The portions of sample output relevant to the A flag are highlighted in bold.
Router# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 366/0/28/0, Other: 0/0/0Serial4/0 Flags: A NS
Ethernet0/0 Flags: F NSPkts: 366/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 107/10/28/2, Other: 1/1/0Serial2/0 Flags: A
Ethernet0/0 Flags: F NSPkts: 106/1Router# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:00:40/stopped, RP 192.168.6.6, flags: SJCIncoming interface: Serial4/0, RPF nbr 192.168.67.6
Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:00:40/00:02:59(192.168.1.2, 239.1.1.1), 00:00:03/00:02:56, flags: JTIncoming interface: Serial2/0, RPF nbr 192.168.37.3
Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:00:03/00:02:59F Flag
Table 7 describes the F flag.
F Flag Sample Output
Interfaces with the F flag set in the MFIB correspond to interfaces in the outgoing interface list for their respective mroute entries, as shown in the following output for the multicast group 239.1.1.1:
Note The portions of sample output relevant to the F flag are highlighted in bold.
Router# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 366/0/28/0, Other: 0/0/0Serial4/0 Flags: A NSEthernet0/0 Flags: F NSPkts: 366/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 107/10/28/2, Other: 1/1/0Serial2/0 Flags: AEthernet0/0 Flags: F NSPkts: 106/1Router# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:00:40/stopped, RP 192.168.6.6, flags: SJCIncoming interface: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:00:40/00:02:59(192.168.1.2, 239.1.1.1), 00:00:03/00:02:56, flags: JTIncoming interface: Serial2/0, RPF nbr 192.168.37.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:00:03/00:02:59NS Flag
Table 9 describes the NS flag.
IC Flag
Table 10 describes the IC flag.
IC Flag Output Samples
Note The configuration lines and portions of sample output relevant to the IC flag are highlighted in bold.
Static IGMP Join
The following example configures a static IGMP join for multicast group 239.1.1.1 under Ethernet interface 0/0:
interface Ethernet0/0
ip address 192.168.7.7 255.255.255.0ip pim sparse-modeip igmp join-group 239.1.1.1
The following sample ouput from the show ip mfib command verifies that the IC flag is set for Ethernet interface 0/0:
Router# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 366/0/28/0, Other: 0/0/0Serial4/0 Flags: A NSEthernet0/0 Flags: F IC NSPkts: 366/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 3978/10/28/2, Other: 1/1/0Serial2/0 Flags: AEthernet0/0 Flags: F IC NSPkts: 3977/1
Note The ip igmp static-group command will not set the IC flag.
Auto-RP Groups 224.0.1.39 and 224.0.1.40
The following output from the show ip igmp group and show ip mfib command confirms that this router is both an RP and Mapping Agent and has the IC flag set to process switch Auto-RP multicast packets.
Note All routers, including the RP, will join the multicast group 224.0.1.40. In addition to the multicast group 224.0.1.40, Mapping Agents will also join 224.0.1.39.
Router# show ip igmp group
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted224.0.1.39 Serial2/0 02:57:51 stopped 192.168.26.6224.0.1.39 Serial1/0 02:57:51 stopped 192.168.67.6224.0.1.39 Ethernet0/0 02:57:51 00:02:11 192.168.16.6224.0.1.39 Loopback0 02:57:51 00:02:07 192.168.6.6224.0.1.40 Loopback0 02:57:51 00:02:11 192.168.6.6239.1.1.1 Ethernet0/0 02:58:51 00:02:13 192.168.16.6224.1.1.1 Ethernet0/0 02:58:51 00:02:13 192.168.16.6Router# show ip mfib 224.0.1.39
(*,224.0.1.39) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: F IC NSPkts: 0/0Serial2/0 Flags: F IC NSPkts: 0/0Serial1/0 Flags: F IC NSPkts: 0/0Ethernet0/0 Flags: F IC NSPkts: 0/0(192.168.6.6,224.0.1.39) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: A ICSerial2/0 Flags: F IC NSPkts: 0/0Serial1/0 Flags: F IC NSPkts: 0/0Ethernet0/0 Flags: F IC NSPkts: 0/0Router# show ip mfib 224.0.1.40
(*,224.0.1.40) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: F IC NSPkts: 0/0Serial2/0 Flags: F NSPkts: 0/0Serial1/0 Flags: F NSPkts: 0/0(192.168.6.6,224.0.1.40) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: A ICSerial2/0 Flags: F NSPkts: 0/0Serial1/0 Flags: F NSPkts: 0/0Linkscope Multicast Groups 224.0.0.0/24
The following output from the show ip mfib linkscope command confirms that the IC flag is set to process multicast control packets:
Router# show ip mfib linkscope
. . .(*,224.0.0.1) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: ICSerial4/0 Flags: ICSerial3/0 Flags: ICSerial2/0 Flags: ICEthernet1/0 Flags: ICEthernet0/0 Flags: IC(*,224.0.0.2) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: ICSerial4/0 Flags: ICSerial3/0 Flags: ICSerial2/0 Flags: ICEthernet1/0 Flags: ICEthernet0/0 Flags: IC(*,224.0.0.13) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: ICSerial4/0 Flags: ICSerial3/0 Flags: ICSerial2/0 Flags: ICEthernet1/0 Flags: ICEthernet0/0 Flags: IC(*,224.0.0.22) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback0 Flags: ICSerial4/0 Flags: ICSerial3/0 Flags: ICSerial2/0 Flags: ICEthernet1/0 Flags: ICEthernet0/0 Flags: ICPIM Tunnel Interfaces
PIM tunnel interfaces are used by MFIB for the PIM-SM registration process. Two types of PIM tunnel interfaces are used by the MFIB:
•A PIM encapsulation tunnel (PIM Encap Tunnel)
•A PIM decapsulation tunnel (PIM Decap Tunnel).
The PIM Encap Tunnel is dynamically created whenever a group-to-RP mapping is learned (via Auto-RP, BSR, or static RP configuration). The PIM Encap Tunnel is used to encapsulate multicast packets sent by first-hop DRs that have directly connected sources.
Similar to the PIM Encap Tunnel, the PIM Decap Tunnel interface is dynamically created—with the exception that it is created on the RP only whenever a group-to-rp mapping is learned. The PIM Decap Tunnel interface is used by the RP to decapsulate PIM registers.
Note PIM tunnels will not appear in the running configuration.
The following syslog message will appear when a PIM tunnel interface is created:
* %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel<interface_number>, changed state to upHow to Verify IPv4 Multicast Forwarding Using the MFIB
This section contains the following tasks:
•Verifying IPv4 Multicast Forwarding Using the MFIB (PIM-SM, PIM-SSM, and Bidir-PIM) (optional)
•Verifying PIM Tunnel Interfaces (PIM-SM) (optional)
Verifying IPv4 Multicast Forwarding Using the MFIB (PIM-SM, PIM-SSM, and Bidir-PIM)
Perform this optional task to verify multicast forwarding using the MFIB in PIM-SM, PIM-SSM, and bidir-PIM networks.
When you verify IPv4 multicast forwarding using the MFIB in PIM network environments, a useful approach is to begin the verification process on the last-hop DR, and then continue the verification process on the routers along the SPT for PIM-SM or PIM SSM (or on the shared tree for bidir-PIM) until the first-hop DR has been reached. The goal of the verification is to ensure that IP multicast traffic is being forwarded properly through an IP multicast network.
Prerequisites
The tasks in this module assume that IP multicast has been enabled and that PIM-SM, PIM-SSM, or bidir-PIM have been configured using the relevant tasks described in the "Configuring Basic IP Multicast" module.
Restrictions
You must be running a Cisco IOS image that supports the IPv4 MFIB infrastructure.
SUMMARY STEPS
1. enable
2. show ip mroute
3. show ip mrib route
4. show ip mfib
5. show ip pim rp mapping
6. show ip igmp groups
DETAILED STEPS
Verifying PIM Tunnel Interfaces (PIM-SM)
Perform this optional task verify to verify the PIM tunnel interfaces that are used by the MFIB for the PIM-SM registration process. This task can be performed if you suspect that there may be problems related to PIM-SM registration.
SUMMARY STEPS
1. enable
2. show ip pim rp mapping
3. show ip pim tunnel
4. show ip mfib
or
show ip mrib routeDETAILED STEPS
Step 1 enable
Enables privileged EXEC mode. Enter your password if prompted.
Router> enable
Step 2 show ip pim rp mapping
Displays all group-to-RP mappings of which the router is aware (either configured or learned from Auto-RP or BSR). Use this command to confirm which router is acting as the RP.
Sample Output from an RP
The following is sample output from the show ip pim rp mapping command. The output confirms that the router in this example is the RP.
RP# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 01:04:03, expires: 00:02:53Sample Output from a Non-RP
The following is sample output from the show ip pim rp mapping command. The output confirms that this router is not the RP.
Non-RP# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 00:40:55, expires: 00:02:45Step 3 show ip pim tunnel
Displays the PIM tunnel interfaces used by the MFIB for the PIM-SM registration process.
Sample Output from an RP (show ip pim tunnel)
The following is output from the show ip pim tunnel command. The output is used to verify the PIM Encap and Decap Tunnel on the RP.
RP# show ip pim tunnel
Tunnel0Type : PIM EncapRP : 192.168.6.6*Source: 192.168.6.6Tunnel1Type : PIM DecapRP : 192.168.6.6*Source: -
Note The asterisk (*) indicates that the router is the RP. The RP will always have a PIM Encap and Decap Tunnel interface.
Sample Output from a Non-RP (show ip pim tunnel)
The following is output from the show ip pim tunnel command. The output is used to confirm that a PIM Encap Tunnel has been created on a non-RP router.
Non-RP# show ip pim tunnel
Tunnel0Type : PIM EncapRP : 192.168.6.6Source: 192.168.67.7Step 4 show ip mfib
Displays the forwarding entries and interfaces in the MFIB.
or
show ip mrib route
Displays the MRIB table.
Use either the show ip mfib command or the show ip mrib route command to verify that the entries registering for PIM-SM have the F flag set for the PIM Encap Tunnel.
Configuration Examples for Verifying IPv4 Multicast Forwarding Using the MFIB
This section provides the following verification examples:
•Verifying IPv4 Multicast Forwarding Using the MFIB for PIM-SM: Examples
•Verifying IPv4 Multicast Forwarding Using the MFIB for PIM-SSM: Examples
•Verifying IPv4 Multicast Forwarding Using the MFIB for Bidir-PIM Networks: Examples
Verifying IPv4 Multicast Forwarding Using the MFIB for PIM-SM: Examples
This section contains the following examples for verifying multicast forwarding using the MFIB for PIM-SM networks:
•Active Sources and Interested Receivers (SPT Switchover): PIM-SM Example
•Active Sources and Interested Receivers (SPT Threshold Set to Infinity): PIM-SM Example
•Source Traffic Only with No Receivers: PIM-SM Example
•Interested Receivers with No Active Sources: PIM-SM Example
Active Sources and Interested Receivers (SPT Switchover): PIM-SM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SM in a network environment where there are active sources with interested receivers. This verification example is based on the topology shown in Figure 1.
Figure 1 PIM-SM Example Topology: Active Sources and Interested Receivers (SPT Switchover)
In this verification example, the following conditions apply:
•All routers have the SPT switchover set to the default (ip pim spt-threshold 0).
•Because the SPT threshold is set to 0, all last-hop DRs with interested receivers will perform an SPT switchover when multicast traffic is received on the shared tree.
•During the PIM-SM registration process between the first-hop DR and the RP, a PIM tunnel is used. First-hop DRs will have a PIM Encap Tunnel and the RP will have both a PIM Encap and Decap Tunnel. After the PIM-SM registration process completes, PIM tunnels will not be used for multicast forwarding. For more information, see the "Verifying PIM Tunnel Interfaces (PIM-SM)" section.
R1 (First-Hop DR)
R1# show ip pim rp mappingPIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R1# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:53:08/stopped, RP 192.168.6.6, flags: SPFIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list: Null(192.168.1.2, 239.1.1.1), 00:53:08/00:03:12, flags: FTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:38:25/00:03:07R1# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.123.2 Flags: CEthernet1/0 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet0/0 Flags: AEthernet1/0 Flags: F NSR1# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 23058/0/23058Ethernet1/0 Flags: A(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 23059/10/28/2, Other: 8826/0/8826Ethernet0/0 Flags: AEthernet1/0 Flags: F NSPkts: 23058/0R2 (Router Along the SPT)
R2# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R2# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:39:05/00:02:53, RP 192.168.6.6, flags: SIncoming interface: Serial2/0, RPF nbr 192.168.26.6Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:39:05/00:02:53(192.168.16.1, 239.1.1.1), 00:03:31/00:02:54, flags: TIncoming interface: Serial2/0, RPF nbr 192.168.26.6Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:03:31/00:02:56(192.168.1.2, 239.1.1.1), 00:39:05/00:02:42, flags: PTIncoming interface: Ethernet1/0, RPF nbr 192.168.123.1Outgoing interface list: NullR2# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.26.6 Flags: CEthernet1/0 Flags: F NSSerial2/0 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 192.168.123.1 Flags:Ethernet1/0 Flags: A(192.168.16.1,239.1.1.1) RPF nbr: 192.168.26.6 Flags:Serial2/0 Flags: AEthernet1/0 Flags: F NSR2# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 21343/0/28/0, Other: 0/0/0Serial2/0 Flags: AEthernet1/0 Flags: F NSPkts: 21343/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 21643/0/28/0, Other: 1812/1/1811Ethernet1/0 Flags: A(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 2112/10/28/2, Other: 0/0/0Serial2/0 Flags: AEthernet1/0 Flags: F NSPkts: 2112/0R3 (Router Along the SPT)
R3# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R3# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:40:32/00:03:19, RP 192.168.6.6, flags: SIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list:Serial3/0, Forward/Sparse, 00:40:32/00:03:19(192.168.16.1, 239.1.1.1), 00:04:58/00:02:29, flags: TIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list:Serial3/0, Forward/Sparse, 00:04:58/00:03:26(192.168.1.2, 239.1.1.1), 00:04:58/00:02:26, flags: TIncoming interface: Ethernet1/0, RPF nbr 192.168.123.1Outgoing interface list:Serial2/0, Forward/Sparse, 00:04:28/00:02:57Serial3/0, Forward/Sparse, 00:04:58/00:03:27R3# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.123.2 Flags: CSerial3/0 Flags: F NSEthernet1/0 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 192.168.123.1 Flags:Ethernet1/0 Flags: ASerial2/0 Flags: F NSSerial3/0 Flags: F NS(192.168.16.1,239.1.1.1) RPF nbr: 192.168.123.2 Flags:Ethernet1/0 Flags: ASerial3/0 Flags: F NSR3# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 42686/0/28/0, Other: 0/0/0Ethernet1/0 Flags: ASerial3/0 Flags: F NSPkts: 42686/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 2984/10/28/2, Other: 0/0/0Ethernet1/0 Flags: ASerial3/0 Flags: F NSPkts: 2984/0Serial2/0 Flags: F NSPkts: 2684/0(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 2984/10/28/2, Other: 0/0/0Ethernet1/0 Flags: ASerial3/0 Flags: F NSPkts: 2984/0R4 (Last-Hop DR for Receiver B)
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R4# show ip igmp groups 239.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.1.1.1 Ethernet0/0 00:06:39 00:02:56 192.168.4.1R4# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:42:12/stopped, RP 192.168.6.6, flags: SJCIncoming interface: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:42:12/00:02:02(192.168.16.1, 239.1.1.1), 00:06:37/00:02:16, flags: JTIncoming interface: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:06:37/00:02:02(192.168.1.2, 239.1.1.1), 00:06:37/00:02:19, flags: JTIncoming interface: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:06:37/00:02:02R4# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.34.3 Flags: CSerial1/0 Flags: A NSEthernet0/0 Flags: F NS(192.168.1.2,239.1.1.1) RPF nbr: 192.168.34.3 Flags:Serial1/0 Flags: AEthernet0/0 Flags: F NS(192.168.16.1,239.1.1.1) RPF nbr: 192.168.34.3 Flags:Serial1/0 Flags: AEthernet0/0 Flags: F NSR4# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 42684/0/28/0, Other: 0/0/0Serial1/0 Flags: A NSEthernet0/0 Flags: F NSPkts: 42684/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 3980/10/28/2, Other: 0/0/0Serial1/0 Flags: AEthernet0/0 Flags: F NSPkts: 3979/1(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 3980/10/28/2, Other: 0/0/0Serial1/0 Flags: AEthernet0/0 Flags: F NSPkts: 3979/1R6 (RP and First-Hop DR for Source B)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:10:53, expires: 00:02:06R6# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:58:12/00:03:25, RP 192.168.6.6, flags: SFIncoming interface: Null, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 00:43:25/00:03:22Serial2/0, Forward/Sparse, 00:43:29/00:03:25(192.168.1.2, 239.1.1.1), 00:58:12/00:02:47, flags: PTIncoming interface: Serial2/0, RPF nbr 192.168.26.2Outgoing interface list: Null(192.168.16.1, 239.1.1.1), 00:58:12/00:03:17, flags: FTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 00:43:25/00:03:22Serial2/0, Forward/Sparse, 00:43:29/00:03:27R6# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 0.0.0.0 Flags: CSerial1/0 Flags: F NSSerial2/0 Flags: F NSTunnel1 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 192.168.26.2 Flags:Serial2/0 Flags: A NS(192.168.16.1,239.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet0/0 Flags: ASerial1/0 Flags: F NSSerial2/0 Flags: F NSR6# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Tunnel1 Flags: ASerial2/0 Flags: F NSPkts: 0/0Serial1/0 Flags: F NSPkts: 0/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 21604/0/28/0, Other: 39/1/38Serial2/0 Flags: A NS(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 26099/10/28/2, Other: 8827/0/8827Ethernet0/0 Flags: ASerial2/0 Flags: F NSPkts: 26098/0Serial1/0 Flags: F NSPkts: 26058/0R7 (Last-Hop DR for Receiver A)
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R7# show ip igmp groups 239.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.1.1.1 Ethernet0/0 00:08:47 00:02:56 192.168.7.1R7# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:44:45/stopped, RP 192.168.6.6, flags: SJCIncoming interface: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:44:45/00:02:47(192.168.1.2, 239.1.1.1), 00:08:45/00:02:13, flags: JTIncoming interface: Serial2/0, RPF nbr 192.168.37.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:08:45/00:02:47(192.168.16.1, 239.1.1.1), 00:08:45/00:02:10, flags: JTIncoming interface: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:08:45/00:02:47R7# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.67.6 Flags: CSerial4/0 Flags: A NSEthernet0/0 Flags: F NS(192.168.1.2,239.1.1.1) RPF nbr: 192.168.37.3 Flags:Serial2/0 Flags: AEthernet0/0 Flags: F NS(192.168.16.1,239.1.1.1) RPF nbr: 192.168.67.6 Flags:Serial4/0 Flags: AEthernet0/0 Flags: F NSR7# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 43204/0/28/0, Other: 0/0/0Serial4/0 Flags: A NSEthernet0/0 Flags: F NSPkts: 43204/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 5255/10/28/2, Other: 1/1/0Serial2/0 Flags: AEthernet0/0 Flags: F NSPkts: 5254/1(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 5255/10/28/2, Other: 0/0/0Serial4/0 Flags: AEthernet0/0 Flags: F NSPkts: 5254/1Active Sources and Interested Receivers (SPT Threshold Set to Infinity): PIM-SM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SM in a network environment where there are active sources with interested receivers. This verification example is based on the topology shown in Figure 2.
Figure 2 PIM-SM Example Topology: Active Sources and Interested Receivers (SPT Threshold Set to Infinity)
For this verification example, the following conditions apply:
•Last-hop DRs R4 and R7 have the SPT threshold set to infinity (configured with the ip pim spt-threshold infinity command).
Note When the SPT threshold is set to infinity, multicast traffic is configured to stay on the shared tree. Last-hop DRs will not perform an SPT switchover.
•During the PIM-SM registration process between the first-hop DR and the RP, a PIM tunnel is used. First-hop DRs will have a PIM Encap Tunnel and the RP will have both a PIM Encap and Decap Tunnel. After the PIM-SM registration process completes, PIM tunnels will not be used for multicast forwarding. For more information, see the "Verifying PIM Tunnel Interfaces (PIM-SM)" section.
R1 (First-Hop DR for Source A)
R1# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R1# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:37:29/stopped, RP 192.168.6.6, flags: SPFIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list: Null(192.168.1.2, 239.1.1.1), 00:37:29/00:02:53, flags: FTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:22:46/00:03:19R1# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.123.2 Flags: CEthernet1/0 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet0/0 Flags: AEthernet1/0 Flags: F NSR1# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 13688/0/13688Ethernet1/0 Flags: A(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 13689/10/28/2, Other: 8826/0/8826Ethernet0/0 Flags: AEthernet1/0 Flags: F NSPkts: 13688/0R2 (Router Along SPT for Source A and Shared Tree for Source B)
R2# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R2# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:23:28/00:02:44, RP 192.168.6.6, flags: SIncoming interface: Serial2/0, RPF nbr 192.168.26.6Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:23:28/00:02:44(192.168.1.2, 239.1.1.1), 00:23:28/00:02:54, flags: TIncoming interface: Ethernet1/0, RPF nbr 192.168.123.1Outgoing interface list:Serial2/0, Forward/Sparse, 00:23:28/00:02:40R2# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.26.6 Flags: CEthernet1/0 Flags: F NSSerial2/0 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 192.168.123.1 Flags:Ethernet1/0 Flags: ASerial2/0 Flags: F NSR2# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 14084/10/28/2, Other: 0/0/0Serial2/0 Flags: AEthernet1/0 Flags: F NSPkts: 14084/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 14083/10/28/2, Other: 1/1/0Ethernet1/0 Flags: ASerial2/0 Flags: F NSPkts: 14083/0R3 (Router Along the Shared Tree)
R3# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R3# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:23:57/00:03:10, RP 192.168.6.6, flags: SIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list:Serial3/0, Forward/Sparse, 00:23:57/00:03:10R3# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.123.2 Flags: CSerial3/0 Flags: F NSEthernet1/0 Flags: AR3# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 28742/20/28/4, Other: 0/0/0Ethernet1/0 Flags: ASerial3/0 Flags: F NSPkts: 28742/0R4 (Last-Hop DR for Receiver B)
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R4# show ip igmp groups 239.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.1.1.1 Ethernet0/0 00:24:37 00:02:56 192.168.4.1R4# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:24:35/00:02:35, RP 192.168.6.6, flags: SCIncoming interface: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:24:35/00:02:35R4# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.34.3 Flags: CEthernet0/0 Flags: F NSSerial1/0 Flags: AR4# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 29517/20/28/4, Other: 0/0/0Serial1/0 Flags: AEthernet0/0 Flags: F NSPkts: 29517/0R6 (RP and First-Hop DR for Source B)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:10:53, expires: 00:02:06R6# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:39:44/00:03:09, RP 192.168.6.6, flags: SFIncoming interface: Null, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 00:24:57/00:03:09Serial2/0, Forward/Sparse, 00:25:01/00:03:09(192.168.1.2, 239.1.1.1), 00:39:44/00:03:18, flags: TIncoming interface: Serial2/0, RPF nbr 192.168.26.2Outgoing interface list:Serial1/0, Forward/Sparse, 00:24:57/00:03:09(192.168.16.1, 239.1.1.1), 00:39:44/00:02:35, flags: FTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 00:24:57/00:03:09Serial2/0, Forward/Sparse, 00:25:01/00:03:09R6# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 0.0.0.0 Flags: CSerial1/0 Flags: F NSSerial2/0 Flags: F NSTunnel1 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 192.168.26.2 Flags:Serial2/0 Flags: ASerial1/0 Flags: F NS(192.168.16.1,239.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet0/0 Flags: ASerial1/0 Flags: F NSSerial2/0 Flags: F NSR6# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Tunnel1 Flags: ASerial2/0 Flags: F NSPkts: 0/0Serial1/0 Flags: F NSPkts: 0/0(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 14978/10/28/2, Other: 39/1/38Serial2/0 Flags: ASerial1/0 Flags: F NSPkts: 14978/0(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 15019/10/28/2, Other: 8827/0/8827Ethernet0/0 Flags: ASerial2/0 Flags: F NSPkts: 15018/0Serial1/0 Flags: F NSPkts: 14978/0R6# show ip pim tunnel
Tunnel0Type : PIM EncapRP : 192.168.6.6*Source: 192.168.6.6Tunnel1*Type : PIM DecapRP : 192.168.6.6*Source: -R7 (Last-Hop DR for Receiver A)
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R7# show ip igmp groups 239.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.1.1.1 Ethernet0/0 00:25:39 00:02:56 192.168.7.1R7# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:25:37/00:02:58, RP 192.168.6.6, flags: SCIncoming interface: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:25:37/00:02:58R7# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.67.6 Flags: CEthernet0/0 Flags: F NSSerial4/0 Flags: AR7# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 30756/20/28/4, Other: 0/0/0Serial4/0 Flags: AEthernet0/0 Flags: F NSPkts: 30756/0Source Traffic Only with No Receivers: PIM-SM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SM in a network environment where sources are sending traffic without interested receivers. This verification example is based on the topology shown in Figure 3.
Figure 3 PIM-SM Example Topology: Source Traffic Only with No Receivers
In this verification example, the following conditions apply:
•Source A and Source B are sending traffic for multicast group 239.1.1.1 to first-hop DRs R1 and R6, respectively.
•When R1 and R6 receive the source traffic, they will then check their group-to-RP mapping cache for multicast group 239.1.1.1 to determine the RP. In this case, R6 is the RP.
•After determining the RP, R1 and R6 will then create state and send PIM registers for (Source A, 239.1.1.1) and (Source B, 239.1.1.1) toward the RP.
•Because there are no interested receivers, the RP will send a register stop to R1 and R6 (itself).
•R1 and R6 are the only routers that will have (S, G) state for 239.1.1.1.
•Routers that are not the RP or directly connected to an active source will not create state for (*, 239.1.1.1).
R1 (First-Hop DR for Source A)
R1# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R1# show ip mroute 239.1.1.1
Outgoing interface flags: H - Hardware switched, A - Assert winnerTimers: Uptime/ExpiresInterface state: Interface, Next-Hop or VCD, State/Mode(*, 239.1.1.1), 00:02:06/stopped, RP 192.168.6.6, flags: SPFIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list: Null(192.168.1.2, 239.1.1.1), 00:02:06/00:02:53, flags: PFTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list: NullR1# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.123.2 Flags: CEthernet1/0 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet0/0 Flags: AR1# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Ethernet1/0 Flags: A(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 1/0/28/0, Other: 1267/0/1267Ethernet0/0 Flags: AR6 (RP and First-Hop DR for Source B)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:10:53, expires: 00:02:06R6# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:02:48/stopped, RP 192.168.6.6, flags: SPFIncoming interface: Null, RPF nbr 0.0.0.0Outgoing interface list: Null(192.168.1.2, 239.1.1.1), 00:02:42/00:02:17, flags: PIncoming interface: Serial2/0, RPF nbr 192.168.26.2Outgoing interface list: Null(192.168.16.1, 239.1.1.1), 00:02:48/00:02:11, flags: PFTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list: NullR6# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 0.0.0.0 Flags: CTunnel1 Flags: A(192.168.1.2,239.1.1.1) RPF nbr: 192.168.26.2 Flags:Serial2/0 Flags: NSTunnel1 Flags: A(192.168.16.1,239.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet0/0 Flags: AR6# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Tunnel1 Flags: A(192.168.1.2,239.1.1.1) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Tunnel1 Flags: ASerial2/0 Flags: NS(192.168.16.1,239.1.1.1) Flags:SW Forwarding: 1/0/28/0, Other: 1688/0/1688Ethernet0/0 Flags: AR6# show ip pim tunnel
Tunnel0Type : PIM EncapRP : 192.168.6.6*Source: 192.168.6.6Tunnel1*Type : PIM DecapRP : 192.168.6.6*Source: -In this scenario, R2, R3, R4, and R7 have no interested receivers; therefore, they are not on the multicast forwarding path and will not have multicast state. The output for the show ip mroute, show ip mrib route, and show ip mfib route commands would appear only on R2, R3, R4, and R7, as in this example (taken from R2):
R2 (Router Not Along the Multicast Forwarding Path)
R2# show ip mroute 239.1.1.1
Group 239.1.1.1 not foundR2# show ip mrib route 239.1.1.1
No matching routes in MRIB route-DBR2# show ip mfib 239.1.1.1
Group 239.1.1.1 not found
Note The output for the show ip mroute, show ip mrib route, and show ip mfib commands would be the same for R2, R3, R4, and R7 for this scenario.
Interested Receivers with No Active Sources: PIM-SM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SM in a network environment where there are interested receivers with no active sources. This verification example is based on the topology shown in Figure 4.
Figure 4 PIM-SM Example Topology: Interested Receivers with No Active Sources
For this verification example, the following conditions apply:
•Last-hop DRs R4 and R7 also have the SPT threshold set to infinity (configured with the ip pim spt-threshold infinity command).
Note When the SPT threshold is set to infinity, multicast traffic is configured to stay on the shared tree. Last-hop DRs will not perform an SPT switchover.
•Receiver A and Receiver B are sending IGMP joins to R7 and R4, respectively, for multicast group 239.1.1.1.
•When R4 and R7 receive the IGMP joins, they will then check their group-to-RP mapping cache for multicast group 239.1.1.1 to determine the RP.
•After determining the RP, R4 and R7 will then create state and send PIM joins for (*, 239.1.1.1) toward the RP.
Note The unicast routing table is used to build the shared tree entry for (*, 239.1.1.1). Shared tree entries are always rooted at the RP. In this scenario, the shared tree from R4 to R6 is through R3 and R2 because R3's best unicast route (determined by the underlying IGP) is R2. The shared tree for R7 is directly upstream to R6.
•Routers that are not along the shared tree will not create state for (*, 239.1.1.1).
R4 (Last-Hop DR)
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R4# show ip igmp groups 239.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.1.1.1 Ethernet0/0 00:03:07 00:02:56 192.168.4.1R4# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:03:05/00:02:47, RP 192.168.6.6, flags: SJCIncoming interface: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:03:05/00:02:47R4# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.34.3 Flags: CEthernet0/0 Flags: F NSSerial1/0 Flags: A NSR4# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Serial1/0 Flags: A NSEthernet0/0 Flags: F NSPkts: 0/0R3 (Router Along the Shared Tree)
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R3# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:03:40/00:02:47, RP 192.168.6.6, flags: SIncoming interface: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list:Serial3/0, Forward/Sparse, 00:03:40/00:02:47R3# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.123.2 Flags: CSerial3/0 Flags: F NSEthernet1/0 Flags: AR3# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Ethernet1/0 Flags: ASerial3/0 Flags: F NSPkts: 0/0R2 (Router Along the Shared Tree)
R2# show ip pim rp mappingPIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R2# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:04:05/00:03:20, RP 192.168.6.6, flags: SIncoming interface: Serial2/0, RPF nbr 192.168.26.6Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:04:05/00:03:20R2# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.26.6 Flags: CEthernet1/0 Flags: F NSSerial2/0 Flags: AR2# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Serial2/0 Flags: AEthernet1/0 Flags: F NSPkts: 0/0R7 (Last-Hop DR)
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:09:53, expires: 00:02:14R7# show ip igmp groups 239.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.1.1.1 Ethernet0/0 00:04:33 00:02:56 192.168.7.1R7# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:04:31/00:02:36, RP 192.168.6.6, flags: SJCIncoming interface: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:04:31/00:02:36R7# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 192.168.67.6 Flags: CEthernet0/0 Flags: F NSSerial4/0 Flags: A NSR7# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: A NSEthernet0/0 Flags: F NSPkts: 0/0R6 (RP)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 224.0.0.0/4RP 192.168.6.6 (?), v2v1Info source: 192.168.6.6 (?), elected via Auto-RPUptime: 03:10:53, expires: 00:02:06R6# show ip mroute 239.1.1.1
(*, 239.1.1.1), 00:05:01/00:03:27, RP 192.168.6.6, flags: SIncoming interface: Null, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 00:04:57/00:03:27Serial2/0, Forward/Sparse, 00:05:01/00:03:23R6# show ip mrib route 239.1.1.1
(*,239.1.1.1) RPF nbr: 0.0.0.0 Flags: CSerial1/0 Flags: F NSSerial2/0 Flags: F NSTunnel1 Flags: AR6# show ip mfib 239.1.1.1
(*,239.1.1.1) Flags: CSW Forwarding: 0/0/0/0, Other: 0/0/0Tunnel1 Flags: ASerial2/0 Flags: F NSPkts: 0/0Serial1/0 Flags: F NSPkts: 0/0R6# show ip pim tunnel
Tunnel0Type : PIM EncapRP : 192.168.6.6*Source: 192.168.6.6Tunnel1*Type : PIM DecapRP : 192.168.6.6*Source: -R1 (Router Not Along the Multicast Forwarding Path)
R1# show ip mroute 239.1.1.1
Group 239.1.1.1 not foundR1# show ip mrib route 239.1.1.1
No matching routes in MRIB route-DBR1# show ip mfib 239.1.1.1
Group 239.1.1.1 not found
Note R1 does not have any state for 239.1.1.1 because it does not have an interested receiver, is not along the shared tree path, and does not have a directly connected source.
Verifying IPv4 Multicast Forwarding Using the MFIB for PIM-SSM: Examples
This section contains the following examples for verifying multicast forwarding using the MFIB for PIM-SSM networks:
•Interested Receivers With or Without Active Sources: PIM-SSM Example
•Source Traffic Only with No Active Receivers: PIM-SSM Example
•Unwanted Sources in the SSM Network: PIM-SSM Example
Interested Receivers With or Without Active Sources: PIM-SSM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SSM in a network environment where there are interested receivers with or without active sources. This verification example is based on the topology shown in Figure 5.
Figure 5 PIM-SSM Example Topology: Interested Receivers With or Without Active Sources
For this verification example, the following conditions apply:
•All routers in the network have been configured to run PIM-SSM and have the ip pim ssm default command configured globally.
•Source A is sending multicast packets to SSM group 232.1.1.1.
•Receiver A and Receiver B are interested in receiving multicast from Source A, (192.168.1.2, 232.1.1.1).
•Receiver A and Receiver B are using IGMPv3.
R1 (First-Hop DR for Source A)
R1# show ip mroute 232.1.1.1
(192.168.1.2, 232.1.1.1), 00:07:18/00:03:02, flags: sTIncoming interface: Ethernet0/0, RPF nbr 0.0.0.0Outgoing interface list:Ethernet1/0, Forward/Sparse, 00:07:18/00:03:02R1# show ip mrib route 232.1.1.1
(192.168.1.2,232.1.1.1) RPF nbr: 0.0.0.0 Flags:Ethernet1/0 Flags: F NSEthernet0/0 Flags: AR1# show ip mfib 232.1.1.1
(192.168.1.2,232.1.1.1) Flags:SW Forwarding: 3039/10/28/2, Other: 0/0/0Ethernet0/0 Flags: AEthernet1/0 Flags: F NSPkts: 3039/0R3 (Router Along the SPT)
R3# show ip mroute 232.1.1.1
(192.168.1.2, 232.1.1.1), 00:08:00/00:03:13, flags: sTIncoming interface: Ethernet1/0, RPF nbr 192.168.123.1Outgoing interface list:Serial3/0, Forward/Sparse, 00:08:00/00:03:13Serial2/0, Forward/Sparse, 00:08:00/00:02:59R3# show ip mrib route 232.1.1.1
(192.168.1.2,232.1.1.1) RPF nbr: 192.168.123.1 Flags:Serial3/0 Flags: F NSSerial2/0 Flags: F NSEthernet1/0 Flags: AR3# show ip mfib 232.1.1.1
(192.168.1.2,232.1.1.1) Flags:SW Forwarding: 3514/10/28/2, Other: 0/0/0Ethernet1/0 Flags: ASerial3/0 Flags: F NSPkts: 3514/0Serial2/0 Flags: F NSPkts: 3514/0R4 (Last-Hop DR for Receiver B)
R4# show ip igmp groups 232.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted232.1.1.1 Ethernet0/0 00:12:46 stopped 192.168.4.1R4# show ip mroute 232.1.1.1(192.168.1.2, 232.1.1.1), 00:08:42/stopped, flags: sTIIncoming interface: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:08:42/00:00:17R4# show ip mrib route 232.1.1.1(192.168.1.2,232.1.1.1) RPF nbr: 192.168.34.3 Flags:Serial1/0 Flags: AEthernet0/0 Flags: F NSR4# show ip mfib 232.1.1.1(192.168.1.2,232.1.1.1) Flags:SW Forwarding: 3786/10/28/2, Other: 0/0/0Serial1/0 Flags: AEthernet0/0 Flags: F NSPkts: 3786/0R7 (Last-Hop DR for Receiver A)
R7# show ip igmp groups 232.1.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted232.1.1.1 Ethernet0/0 00:12:24 stopped 192.168.7.1R7# show ip mroute 232.1.1.1
(192.168.1.2, 232.1.1.1), 00:09:37/stopped, flags: sTIIncoming interface: Serial2/0, RPF nbr 192.168.37.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 00:09:37/00:02:22R7# show ip mrib route 232.1.1.1
(192.168.1.2,232.1.1.1) RPF nbr: 192.168.37.3 Flags:Serial2/0 Flags: AEthernet0/0 Flags: F NSR7# show ip mfib 232.1.1.1
(192.168.1.2,232.1.1.1) Flags:SW Forwarding: 4182/10/28/2, Other: 0/0/0Serial2/0 Flags: AEthernet0/0 Flags: F NSPkts: 4182/0Source Traffic Only with No Active Receivers: PIM-SSM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SSM in a network environment where there is an active source with no interested receivers. This verification example is based on the topology shown in Figure 6.
Figure 6 PIM-SSM Example Topology: Source Traffic Only with No Active Receivers
For this verification example, the following conditions apply:
•All routers in the network have been configured to run PIM-SSM and have the ip pim ssm default command configured globally.
•Source A is sending multicast packets to SSM group 232.1.1.1.
•Source B is not actively sending.
•There are no interested receivers in the network.
Routers that support the MFIB will not create state for SSM multicast groups until a join has been requested by an interested receiver, which means that any routers with active sources sending to an SSM group will not have multicast state. Because there are no interested receivers in this network, none of the routers will create state for (192.168.1.2, 232.1.1.1).
The following is output from the show ip mroute, show ip mrib route, and show ip mfib commands taken from R1:
R1
R1# show ip mroute 239.1.1.1Group 239.1.1.1 not foundR1# show ip mrib route 239.1.1.1No matching routes in MRIB route-DBR1# show ip mfib 239.1.1.1Group 239.1.1.1 not found
Note Because there are no interested receivers in this network, the output from the show ip mroute, show ip mrib route, and show ip mfib commands would be the same on R3, R4, and R7 in this example scenario.
Unwanted Sources in the SSM Network: PIM-SSM Example
The following example shows how to verify multicast forwarding using the MFIB for PIM-SSM in a network environment where there is an unwanted source. This verification example is based on the topology shown in Figure 7.
Figure 7 PIM-SSM Example Topology: Unwanted Sources in the SSM Network
For this verification example, the following conditions apply:
•All routers in the network have been configured to run PIM-SSM and have the ip pim ssm default command configured globally.
•Receiver A and Receiver B are only interested in receiving multicast from Source A, (192.168.1.2, 232.1.1.1).
•Unwanted source, Source B, is sending traffic to 232.1.1.1.
Note Even though Source B is directly connected to R3, R3 will not create state for 232.1.1.1. Multicast traffic from Source B sending to SSM group 232.1.1.1, thus, will be immediately dropped by the router.
R3 (First-Hop DR for Unwanted Source B)
R3# show ip mroute 232.1.1.1 192.168.3.1
R3# show ip mrib route 232.1.1.1 192.168.3.1
No matching routes in MRIB route-DBR3# show ip mfib 232.1.1.1 192.168.3.1(192.168.3.1,232.1.1.1) entry not found
Note Likewise, R1, R4, and R7 will also have no multicast state for (192.168.3.1, 232.1.1.1) and any directly connected sources sending to 232.1.1.1 will be dropped.
Verifying IPv4 Multicast Forwarding Using the MFIB for Bidir-PIM Networks: Examples
This section contains the following examples for verifying multicast forwarding using the MFIB for bidir-PIM networks:
•Active Sources with Interested Receivers: Bidir-PIM Example
•Active Sources with No Interested Receivers: Bidir-PIM Example
•No Active Sources with Interested Receivers: Bidir-PIM Example
•No Active Sources with No Interested Receivers: Bidir-PIM Example
Active Sources with Interested Receivers: Bidir-PIM Example
The following example shows how to verify multicast forwarding using the MFIB for bidir-PIM in a network environment where there are active sources and interested receivers. This verification example is based on the topology shown in Figure 8.
Figure 8 Bidir-PIM Example Topology: Active Sources with Interested Receivers
Figure 9 shows the bidir-PIM distribution trees and multicast forwarding paths for the topology illustrated in Figure 8.
Figure 9 Bidir-PIM Distribution Trees and Multicast Forwarding Paths for the Active Sources with No Interested Receivers Example
For this verification example, the following conditions apply:
•Entries for (*, 239.195.0.0/16) are created by the control plane based on the PIM group-to-RP mappings on all routers.
•Entries for (*, 239.195.1.1) will only be created when IGMP joins are initiated by interested receivers joining this group. As a result, all routers along the shared tree between the RP and the last-hop DRs that have interested receivers will have state for (*, 239.195.1.1).
Note R1 will not have state for (*, 239.195.1.1) because it is not between the RP and the last-hop DRs.
•If both (*,239.195.0.0/26) and (*,239.195.1.1) entries are present in a router, the more specific entry, (*,239.195.1.1) will be used for forwarding.
•All source traffic for this scenario will go to the RP and then out the appropriate interfaces where there are interested receivers.
•Source traffic received by the RP is never sent back out the same interface it was received on.
•In general, multicast packet forwarding can be verified by observing the "SW Forwarding" counter in the show ip mfib output for the most specific entry available in the MFIB. If multicast is being forwarded, this counter will increment.
R1 (First-Hop DR for Source A)
R1# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d02h, expires: 00:02:09R1# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.1.1 75 1d02hEthernet1/0 192.168.254.6 192.168.123.2 65 1d02hR1# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR1# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR1# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR1# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d02h/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Ethernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR1# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Ethernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR1# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 4677/10/28/2, Other: 9355/0/9355Ethernet1/0 Flags: A FPkts: 4677/0Ethernet0/0 Flags: ANull0 Flags: AR2 (Router Along the Multicast Forwarding Path)
R2# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d02h, expires: 00:02:45R2# show ip pim interface df* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet1/0 192.168.254.6 *192.168.123.2 65 1d02hSerial2/0 192.168.254.6 192.168.26.6 0 1d02hR2# show ip mroute 239.195.1.1(*, 239.195.1.1), 02:13:50/00:02:36, RP 192.168.254.6, flags: BBidir-Upstream: Serial2/0, RPF nbr 192.168.26.6Outgoing interface list:Ethernet1/0, Forward/Sparse, 02:13:50/00:02:36Serial2/0, Bidir-Upstream/Sparse, 02:13:50/00:00:00R2# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.26.6 Flags: IAEthernet1/0 Flags: FSerial2/0 Flags: FR2# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 14693/30/28/6, Other: 0/0/0Serial2/0 Flags: FPkts: 4897/0Ethernet1/0 Flags: FPkts: 9796/0R2# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d02h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial2/0, RPF nbr: 192.168.26.6Incoming interface list:Ethernet1/0, Accepting/SparseSerial2/0, Accepting/SparseR2# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.26.6 Flags:Ethernet1/0 Flags: ANull0 Flags: ASerial2/0 Flags: A FR2# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial2/0 Flags: A FPkts: 0/0Ethernet1/0 Flags: ANull0 Flags: AR3 (Router Along the Multicast Forwarding Path)
R3# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d02h, expires: 00:02:25R3# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.3.3 75 1d02hEthernet1/0 192.168.254.6 192.168.123.2 65 1d02hSerial2/0 192.168.254.6 192.168.37.7 65 1d02hSerial3/0 192.168.254.6 *192.168.34.3 75 1d02hR3# show ip mroute 239.195.1.1
(*, 239.195.1.1), 02:14:09/00:03:08, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list:Serial3/0, Forward/Sparse, 02:14:09/00:03:08Ethernet1/0, Bidir-Upstream/Sparse, 02:14:09/00:00:00R3# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.123.2 Flags: IASerial3/0 Flags: FEthernet1/0 Flags: FR3# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 15263/30/28/6, Other: 0/0/0Serial3/0 Flags: FPkts: 15263/0Ethernet1/0 Flags: FPkts: 0/0R3# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d02h/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Serial3/0, Accepting/SparseEthernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR3# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Serial3/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR3# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial3/0 Flags: AEthernet1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR4 (Last-Hop DR for Receiver B)
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d02h, expires: 00:02:10R4# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.4.4 139 1d02hSerial1/0 192.168.254.6 192.168.34.3 75 1d02hR4# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.195.1.1 Ethernet0/0 02:14:25 00:02:25 192.168.4.1R4# show ip mroute 239.195.1.1
(*, 239.195.1.1), 02:14:25/00:02:25, RP 192.168.254.6, flags: BCBidir-Upstream: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 02:14:25/00:02:25Serial1/0, Bidir-Upstream/Sparse, 02:14:25/00:00:00R4# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.34.3 Flags: IAEthernet0/0 Flags: FSerial1/0 Flags: FR4# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 15729/30/28/6, Other: 0/0/0Serial1/0 Flags: FPkts: 0/0Ethernet0/0 Flags: FPkts: 15729/0R4# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d02h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial1/0, RPF nbr: 192.168.34.3Incoming interface list:Ethernet0/0, Accepting/SparseSerial1/0, Accepting/SparseR4# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.34.3 Flags:Ethernet0/0 Flags: ANull0 Flags: ASerial1/0 Flags: A FR4# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR6 (RP and First-Hop DR for Source B)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.254.6 (?), elected via Auto-RPUptime: 1d02h, expires: 00:02:55R6# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeLoopback0 192.168.254.6 *192.168.6.6 0 1d02hLoopback1 192.168.254.6 *192.168.254.6 0 1d02hEthernet0/0 192.168.254.6 *192.168.16.6 0 1d02hSerial1/0 192.168.254.6 *192.168.67.6 0 1d02hSerial2/0 192.168.254.6 *192.168.26.6 0 1d02hR6# show ip mroute 239.195.1.1
(*, 239.195.1.1), 02:14:43/00:02:49, RP 192.168.254.6, flags: BBidir-Upstream: Null, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 02:14:35/00:02:49Serial2/0, Forward/Sparse, 02:14:43/00:02:41R6# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 0.0.0.0 Flags: IASerial1/0 Flags: FSerial2/0 Flags: FR6# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 16269/30/28/6, Other: 0/0/0Serial2/0 Flags: FPkts: 10846/0Serial1/0 Flags: FPkts: 10846/0R6# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d02h/-, RP 192.168.254.6, flags: BBidir-Upstream: Loopback1, RPF nbr: 192.168.254.6Incoming interface list:Serial2/0, Accepting/SparseSerial1/0, Accepting/SparseEthernet0/0, Accepting/SparseLoopback0, Accepting/SparseLoopback1, Accepting/SparseR6# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.254.6 Flags:Serial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ALoopback0 Flags: ANull0 Flags: ALoopback1 Flags: A FR6# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback1 Flags: A FPkts: 0/0Loopback0 Flags: ASerial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AR7 (First-Hop DR for Source C and Last-Hop DR for Receiver A)
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d02h, expires: 00:02:35R7# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.7.7 65 1d02hSerial2/0 192.168.254.6 *192.168.37.7 65 1d02hSerial4/0 192.168.254.6 192.168.67.6 0 1d02hR7# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.195.1.1 Ethernet0/0 02:14:51 00:02:44 192.168.7.1R7# show ip mroute 239.195.1.1
(*, 239.195.1.1), 02:14:51/00:02:43, RP 192.168.254.6, flags: BCBidir-Upstream: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 02:14:51/00:02:43Serial4/0, Bidir-Upstream/Sparse, 02:14:51/00:00:00R7# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.67.6 Flags: IAEthernet0/0 Flags: FSerial4/0 Flags: FR7# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 16747/30/28/6, Other: 0/0/0Serial4/0 Flags: FPkts: 5582/0Ethernet0/0 Flags: FPkts: 11165/0R7# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d02h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial4/0, RPF nbr: 192.168.67.6Incoming interface list:Serial2/0, Accepting/SparseEthernet0/0, Accepting/SparseSerial4/0, Accepting/SparseR7# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.67.6 Flags:Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ASerial4/0 Flags: A FR7# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: A FPkts: 0/0Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AActive Sources with No Interested Receivers: Bidir-PIM Example
The following example shows how to verify multicast forwarding using the MFIB for bidir-PIM in a network environment where there are active sources with no interested receivers. This verification example is based on the topology shown in Figure 10 and Figure 11.
Figure 10 Bidir-PIM Example Topology: Active Sources with No Interested Receivers
Figure 11 Bidir-PIM Distribution Trees and Multicast Forwarding Path for Active Sources with No Interested Receivers Example
For this verification example, the following conditions apply:
•Entries for (*, 239.195.0.0/16) are created by the control plane based on the PIM group-to-RP mappings on all routers.
•Because there are no interested receivers, (*, 239.195.0.0/16) will be the only state in the network on all routers.
•All source traffic for this example will go to the RP and then be dropped because there are no interested receivers in the network. In addition, source traffic received by the RP is never sent back out the same interface it was received on.
•In general, multicast packet forwarding can be verified by observing the "SW Forwarding" counter in the show ip mfib output for the most specific entry available in the MFIB. If multicast is being forwarded, this counter will increment.
•In this scenario, all traffic stops at the RP because there are no interested receivers. In addition, traffic received by the RP will be forwarded only to the bidir-PIM RP interface to be dropped.
R1 (First-Hop DR for Source A)
R1# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d03h, expires: 00:02:43R1# show ip pim interface df* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.1.1 75 1d03hEthernet1/0 192.168.254.6 192.168.123.2 65 1d03hR1# show ip mroute 239.195.1.1Group 239.195.1.1 not foundR1# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR1# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR1# show ip mroute 239.195.0.0/16(*,239.195.0.0/16), 1d03h/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Ethernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR1# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Ethernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR1# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 34754/10/28/2, Other: 58228/0/58228Ethernet1/0 Flags: A FPkts: 34754/0Ethernet0/0 Flags: ANull0 Flags: AR2
R2# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d03h, expires: 00:02:28R2# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet1/0 192.168.254.6 *192.168.123.2 65 1d03hSerial2/0 192.168.254.6 192.168.26.6 0 1d03hR2# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR2# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR2# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR2# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d03h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial2/0, RPF nbr: 192.168.26.6Incoming interface list:Ethernet1/0, Accepting/SparseSerial2/0, Accepting/SparseR2# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.26.6 Flags:Ethernet1/0 Flags: ANull0 Flags: ASerial2/0 Flags: A FR2# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 4211/10/28/2, Other: 0/0/0Serial2/0 Flags: A FPkts: 4211/0Ethernet1/0 Flags: ANull0 Flags: AR3
R3# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d03h, expires: 00:02:09R3# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.3.3 75 1d03hEthernet1/0 192.168.254.6 192.168.123.2 65 1d03hSerial2/0 192.168.254.6 192.168.37.7 65 1d03hSerial3/0 192.168.254.6 *192.168.34.3 75 1d03hR3# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group AccountedR3# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR3# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR3# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR3# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d03h/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Serial3/0, Accepting/SparseEthernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR3# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Serial3/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR3# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 3935/0/3935Serial3/0 Flags: AEthernet1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR4
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d03h, expires: 00:02:54R4# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.4.4 139 1d03hSerial1/0 192.168.254.6 192.168.34.3 75 1d03hR4# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group AccountedR4# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR4# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR4# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR4# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d03h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial1/0, RPF nbr: 192.168.34.3Incoming interface list:Ethernet0/0, Accepting/SparseSerial1/0, Accepting/SparseR4# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.34.3 Flags:Ethernet0/0 Flags: ANull0 Flags: ASerial1/0 Flags: A FR4# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR6 (RP and First-Hop DR for Source B)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.254.6 (?), elected via Auto-RPUptime: 1d03h, expires: 00:01:59R6# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeLoopback0 192.168.254.6 *192.168.6.6 0 1d03hLoopback1 192.168.254.6 *192.168.254.6 0 1d03hEthernet0/0 192.168.254.6 *192.168.16.6 0 1d03hSerial1/0 192.168.254.6 *192.168.67.6 0 1d03hSerial2/0 192.168.254.6 *192.168.26.6 0 1d03hR6# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR6# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR6# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR6# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d03h/-, RP 192.168.254.6, flags: BBidir-Upstream: Loopback1, RPF nbr: 192.168.254.6Incoming interface list:Serial2/0, Accepting/SparseSerial1/0, Accepting/SparseEthernet0/0, Accepting/SparseLoopback0, Accepting/SparseLoopback1, Accepting/SparseR6# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.254.6 Flags:Serial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ALoopback0 Flags: ANull0 Flags: ALoopback1 Flags: A FR6# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 13951/30/28/6, Other: 0/0/0Loopback1 Flags: A FPkts: 13951/0Loopback0 Flags: ASerial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AR7 (First-Hop DR for Source C)
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d03h, expires: 00:02:22R7# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.7.7 65 1d03hSerial2/0 192.168.254.6 *192.168.37.7 65 1d03hSerial4/0 192.168.254.6 192.168.67.6 0 1d03hR7# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group AccountedR7# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR7# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR7# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR7# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d03h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial4/0, RPF nbr: 192.168.67.6Incoming interface list:Serial2/0, Accepting/SparseEthernet0/0, Accepting/SparseSerial4/0, Accepting/SparseR7# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.67.6 Flags:Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ASerial4/0 Flags: A FR7# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 4917/10/28/2, Other: 0/0/0Serial4/0 Flags: A FPkts: 4917/0Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ANo Active Sources with Interested Receivers: Bidir-PIM Example
The following example shows how to verify multicast forwarding using the MFIB for bidir-PIM in a network environment where there are no active sources with interested receivers. This verification example is based on the topology shown in Figure 12.
Figure 12 Bidir-PIM Example Topology: No Active Sources with Interested Receivers
For this verification example, the following conditions apply:
•Entries for (*, 239.195.0.0/16) are created by the control plane based on the PIM group-to-RP mappings on all routers.
•Entries for (*, 239.195.1.1) will be created only when IGMP joins are initiated by interested receivers joining this group. As a result, all routers along the shared tree between the RP and the last-hop DRs that have interested receivers will have state for (*, 239.195.1.1).
Note R1 will not have state for (*, 239.195.1.1) because it is not between the RP and the last-hop DRs.
•In general, multicast packet forwarding can be verified by observing the "SW Forwarding" counter in show ip mfib command ouput for the most specific entry available in the MFIB. If multicast is being forwarded, this counter will increment; however, because there are no active sources in this scenario, this counter will not increment.
R1
R1# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d01h, expires: 00:02:07R1# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.1.1 75 1d01hEthernet1/0 192.168.254.6 192.168.123.2 65 1d01hR1# show ip mroute 239.195.1.1
Group 239.195.1.1 not foundR1# show ip mrib route 239.195.1.1
No matching routes in MRIB route-DBR1# show ip mfib 239.195.1.1
Group 239.195.1.1 not foundR1# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d01h/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Ethernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR1# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Ethernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR1# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Ethernet1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR2
R2# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d01h, expires: 00:02:32R2# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet1/0 192.168.254.6 *192.168.123.2 65 1d01hSerial2/0 192.168.254.6 192.168.26.6 0 1d01hR2# show ip mroute 239.195.1.1
(*, 239.195.1.1), 01:30:22/00:02:50, RP 192.168.254.6, flags: BBidir-Upstream: Serial2/0, RPF nbr 192.168.26.6Outgoing interface list:Ethernet1/0, Forward/Sparse, 01:30:22/00:02:50Serial2/0, Bidir-Upstream/Sparse, 01:30:22/00:00:00R2# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.26.6 Flags: IAEthernet1/0 Flags: FSerial2/0 Flags: FR2# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 0/0/0/0, Other: 0/0/0Serial2/0 Flags: FPkts: 0/0Ethernet1/0 Flags: FPkts: 0/0R2# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d01h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial2/0, RPF nbr: 192.168.26.6Incoming interface list:Ethernet1/0, Accepting/SparseSerial2/0, Accepting/SparseR2# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.26.6 Flags:Ethernet1/0 Flags: ANull0 Flags: ASerial2/0 Flags: A FR2# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial2/0 Flags: A FPkts: 0/0Ethernet1/0 Flags: ANull0 Flags: AR3
R3# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d01h, expires: 00:02:17R3# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.3.3 75 1d01hEthernet1/0 192.168.254.6 192.168.123.2 65 1d01hSerial2/0 192.168.254.6 192.168.37.7 65 1d01hSerial3/0 192.168.254.6 *192.168.34.3 75 1d01hR3# show ip mroute 239.195.1.1
(*, 239.195.1.1), 01:30:36/00:03:21, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr 192.168.123.2Outgoing interface list:Serial3/0, Forward/Sparse, 01:30:36/00:03:21Ethernet1/0, Bidir-Upstream/Sparse, 01:30:36/00:00:00R3# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.123.2 Flags: IASerial3/0 Flags: FEthernet1/0 Flags: FR3# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 0/0/0/0, Other: 0/0/0Serial3/0 Flags: FPkts: 0/0Ethernet1/0 Flags: FPkts: 0/0R3# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d01h/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Serial3/0, Accepting/SparseEthernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR3# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Serial3/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR3# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial3/0 Flags: AEthernet1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR4 (Last-Hop DR for Receiver B)
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d01h, expires: 00:02:02R4# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.4.4 139 1d01hSerial1/0 192.168.254.6 192.168.34.3 75 1d01hR4# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.195.1.1 Ethernet0/0 01:30:51 00:02:56 192.168.4.1R4# show ip mroute 239.195.1.1
(*, 239.195.1.1), 01:30:51/00:02:56, RP 192.168.254.6, flags: BCBidir-Upstream: Serial1/0, RPF nbr 192.168.34.3Outgoing interface list:Ethernet0/0, Forward/Sparse, 01:30:51/00:02:56Serial1/0, Bidir-Upstream/Sparse, 01:30:51/00:00:00R4# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.34.3 Flags: IAEthernet0/0 Flags: FSerial1/0 Flags: FR4# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 0/0/0/0, Other: 0/0/0Serial1/0 Flags: FPkts: 0/0Ethernet0/0 Flags: FPkts: 0/0R4# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d01h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial1/0, RPF nbr: 192.168.34.3Incoming interface list:Ethernet0/0, Accepting/SparseSerial1/0, Accepting/SparseR4# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.34.3 Flags:Ethernet0/0 Flags: ANull0 Flags: ASerial1/0 Flags: A FR4# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR6 (RP)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.254.6 (?), elected via Auto-RPUptime: 1d01h, expires: 00:02:30R6# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeLoopback0 192.168.254.6 *192.168.6.6 0 1d01hLoopback1 192.168.254.6 *192.168.254.6 0 1d01hEthernet0/0 192.168.254.6 *192.168.16.6 0 1d01hSerial1/0 192.168.254.6 *192.168.67.6 0 1d01hSerial2/0 192.168.254.6 *192.168.26.6 0 1d01hR6# show ip mroute 239.195.1.1
(*, 239.195.1.1), 01:31:08/00:03:00, RP 192.168.254.6, flags: BBidir-Upstream: Null, RPF nbr 0.0.0.0Outgoing interface list:Serial1/0, Forward/Sparse, 01:31:00/00:03:00Serial2/0, Forward/Sparse, 01:31:08/00:02:57R6# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 0.0.0.0 Flags: IASerial1/0 Flags: FSerial2/0 Flags: FR6# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 0/0/0/0, Other: 0/0/0Serial2/0 Flags: FPkts: 0/0Serial1/0 Flags: FPkts: 0/0R6# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d01h/-, RP 192.168.254.6, flags: BBidir-Upstream: Loopback1, RPF nbr: 192.168.254.6Incoming interface list:Serial2/0, Accepting/SparseSerial1/0, Accepting/SparseEthernet0/0, Accepting/SparseLoopback0, Accepting/SparseLoopback1, Accepting/SparseR6# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.254.6 Flags:Serial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ALoopback0 Flags: ANull0 Flags: ALoopback1 Flags: A FR6# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback1 Flags: A FPkts: 0/0Loopback0 Flags: ASerial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AR7 (Last-Hop DR for Receiver A)
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 1d01h, expires: 00:02:33R7# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.7.7 65 1d01hSerial2/0 192.168.254.6 *192.168.37.7 65 1d01hSerial4/0 192.168.254.6 192.168.67.6 0 1d01hR7# show ip igmp groups 239.195.1.1
IGMP Connected Group MembershipGroup Address Interface Uptime Expires Last Reporter Group Accounted239.195.1.1 Ethernet0/0 01:31:14 00:02:22 192.168.7.1R7# show ip mroute 239.195.1.1
(*, 239.195.1.1), 01:31:14/00:02:22, RP 192.168.254.6, flags: BCBidir-Upstream: Serial4/0, RPF nbr 192.168.67.6Outgoing interface list:Ethernet0/0, Forward/Sparse, 01:31:14/00:02:22Serial4/0, Bidir-Upstream/Sparse, 01:31:14/00:00:00R7# show ip mrib route 239.195.1.1
(*,239.195.1.1) RPF nbr: 192.168.67.6 Flags: IAEthernet0/0 Flags: FSerial4/0 Flags: FR7# show ip mfib 239.195.1.1
(*,239.195.1.1) Flags: IASW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: FPkts: 0/0Ethernet0/0 Flags: FPkts: 0/0R7# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 1d01h/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial4/0, RPF nbr: 192.168.67.6Incoming interface list:Serial2/0, Accepting/SparseEthernet0/0, Accepting/SparseSerial4/0, Accepting/SparseR7# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.67.6 Flags:Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ASerial4/0 Flags: A FR7# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: A FPkts: 0/0Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ANo Active Sources with No Interested Receivers: Bidir-PIM Example
The following example shows how to verify multicast forwarding using the MFIB for bidir-PIM in a network environment where there are no active sources and no interested receivers. This verification example is based on the topology shown in Figure 13.
Figure 13 Bidir-PIM Example Topology: No Active Sources with No Interested Receivers
For this verification example, the following conditions apply:
•Entries for (*, 239.195.0.0/16) are created by the control plane based on the PIM group-to-RP mappings on all routers.
•Entries for any group within the range 239.195.0.0/16 will be created only when IGMP joins are initiated by interested receivers joining that particular group. For example, if a multicast receiver joins the group 239.195.1.1, an entry for (*, 239.195.1.1) will be created on all routers along the shared tree.
•Because there are no interested receivers, (*, 239.195.0.0/16) will be the only state in the network on all routers.
•In general, multicast packet forwarding can be verified by observing the "SW Forwarding" counter in show ip mfib command ouput for the most specific entry available in the MFIB. If multicast is being forwarded, this counter will increment; however, because there are no active sources in this scenario, this counter will not increment.
R1
R1# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 22:06:01, expires: 00:02:30R1# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 22:06:01/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Ethernet0/0, Accepting/SparseEthernet1/0, Accepting/SparseR1# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Ethernet0/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR1# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Ethernet1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR1# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.1.1 75 22:06:01Ethernet1/0 192.168.254.6 192.168.123.2 65 22:06:01R2
R2# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 22:09:00, expires: 00:02:30R2# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 22:09:00/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial2/0, RPF nbr: 192.168.26.6Incoming interface list:Ethernet1/0, Accepting/SparseSerial2/0, Accepting/SparseR2# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.26.6 Flags:Ethernet1/0 Flags: ANull0 Flags: ASerial2/0 Flags: A FR2# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial2/0 Flags: A FPkts: 0/0Ethernet1/0 Flags: ANull0 Flags: AR2# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet1/0 192.168.254.6 *192.168.123.2 65 22:09:00Serial2/0 192.168.254.6 192.168.26.6 0 22:09:00R3
R3# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 22:09:20, expires: 00:02:12R3# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 22:09:20/-, RP 192.168.254.6, flags: BBidir-Upstream: Ethernet1/0, RPF nbr: 192.168.123.2Incoming interface list:Serial3/0, Accepting/SparseEthernet1/0, Accepting/SparseR3# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.123.2 Flags:Serial3/0 Flags: ANull0 Flags: AEthernet1/0 Flags: A FR3# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial3/0 Flags: AEthernet1/0 Flags: A FPkts: 0/0Null0 Flags: AR3# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet1/0 192.168.254.6 192.168.123.2 65 22:09:20Serial2/0 192.168.254.6 192.168.37.7 65 22:09:20Serial3/0 192.168.254.6 *192.168.34.3 75 22:09:20R4
R4# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 22:09:47, expires: 00:02:42R4# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 22:09:47/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial1/0, RPF nbr: 192.168.34.3Incoming interface list:Ethernet0/0, Accepting/SparseSerial1/0, Accepting/SparseR4# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.34.3 Flags:Ethernet0/0 Flags: ANull0 Flags: ASerial1/0 Flags: A FR4# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial1/0 Flags: A FPkts: 0/0Ethernet0/0 Flags: ANull0 Flags: AR4# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.4.4 139 22:09:47Serial1/0 192.168.254.6 192.168.34.3 75 22:09:47R6 (RP)
R6# show ip pim rp mapping
PIM Group-to-RP MappingsThis system is an RP (Auto-RP)This system is an RP-mapping agent (Loopback0)Group(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.254.6 (?), elected via Auto-RPUptime: 22:11:08, expires: 00:02:48R6# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 22:11:08/-, RP 192.168.254.6, flags: BBidir-Upstream: Loopback1, RPF nbr: 192.168.254.6Incoming interface list:Serial2/0, Accepting/SparseSerial1/0, Accepting/SparseEthernet0/0, Accepting/SparseLoopback1, Accepting/SparseR6# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.254.6 Flags:Serial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ALoopback1 Flags: A FR6# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Loopback1 Flags: A FPkts: 0/0Serial2/0 Flags: ASerial1/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AR6# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeLoopback1 192.168.254.6 *192.168.254.6 0 22:11:08Ethernet0/0 192.168.254.6 *192.168.16.6 0 22:11:08Serial1/0 192.168.254.6 *192.168.67.6 0 22:11:08Serial2/0 192.168.254.6 *192.168.26.6 0 22:11:08R7
R7# show ip pim rp mapping
PIM Group-to-RP MappingsGroup(s) 239.195.0.0/16RP 192.168.254.6 (?), v2v1, bidirInfo source: 192.168.6.6 (?), elected via Auto-RPUptime: 22:10:23, expires: 00:02:04R7# show ip mroute 239.195.0.0/16
(*,239.195.0.0/16), 22:10:23/-, RP 192.168.254.6, flags: BBidir-Upstream: Serial4/0, RPF nbr: 192.168.67.6Incoming interface list:Serial2/0, Accepting/SparseEthernet0/0, Accepting/SparseSerial4/0, Accepting/SparseR7# show ip mrib route 239.195.0.0/16
(*,239.195.0.0/16) RPF nbr: 192.168.67.6 Flags:Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: ASerial4/0 Flags: A FR7# show ip mfib 239.195.0.0/16
(*,239.195.0.0/16) Flags:SW Forwarding: 0/0/0/0, Other: 0/0/0Serial4/0 Flags: A FPkts: 0/0Serial2/0 Flags: AEthernet0/0 Flags: ANull0 Flags: AR7# show ip pim interface df
* implies this system is the DFInterface RP DF Winner Metric UptimeEthernet0/0 192.168.254.6 *192.168.7.7 65 22:10:23Serial2/0 192.168.254.6 *192.168.37.7 65 22:10:23Serial4/0 192.168.254.6 192.168.67.6 0 22:10:23Additional References
The following sections provide references related to verifying IPv4 multicast forwarding using the MFIB.
Related Documents
Related Topic Document TitleMFIB overview concepts and MFIB/MRIB entry and interface flag descriptions
"Multicast Forwarding Information Base (MFIB) Overview" module
Overview of the IP multicast technology area
"IP Multicast Technology Overview" module
Concepts, tasks, and examples for configuring an IP multicast network using PIM
IP multicast commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples
Standards
Standard TitleNo new or modified standards are supported, and support for existing standards has not been modified.
—
MIBs
RFCs
RFC TitleNo new or modified RFCs are supported, and support for existing RFCs has not been modified.
—
Technical Assistance
Feature Information for Verifying IPv4 Multicast Forwarding Using the MFIB
Table 11 lists the features in this module and provides links to specific configuration information. Only features that were introduced or modified in Cisco IOS Release 12.2(1) or a later release appear in the table.
For information on a feature in this technology that is not documented here, see the "IP Multicast Features Roadmap."
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 11 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.
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