IGMP Static Group Range Support

This module describes how you can simplify the administration of networks with devices that require static group membership entries on many interfaces by configuring IGMP static group range support to specify group ranges in class maps and attach the class maps to an interface.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and 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 table.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Information About IGMP Static Group Range Support

IGMP Static Group Range Support Overview

Prior to the introduction of the IGMP Static Group Range Support feature, there was no option to specify group ranges for static group membership. Administering devices that required static group membership entries on many interfaces was challenging in some network environments because each static group had to be configured individually. The result was configurations that were excessively long and difficult to manage.

The IGMP Static Group Range Support feature introduces the capability to configure group ranges in class maps and attach class maps to the interface.

Class Maps for IGMP Static Group Range Support

A class is a way of identifying a set of packets based on its contents. A class is designated through class maps. Typically, class maps are used to create traffic policies. Traffic policies are configured using the modular quality of service (QoS) command-line interface (CLI) (MQC). The normal procedure for creating traffic policies entails defining a traffic class, creating a traffic policy, and attaching the policy to an interface.

The IGMP Static Group Range Support feature introduces a type of class map that is used to define group ranges, group addresses, Source Specific Multicast (SSM) channels, and SSM channel ranges. Once created, the class map can be attached to interfaces.

Although IGMP Static Group Range Support feature uses the MQC to define class maps, the procedure for configuring IGMP static group class maps is different from the procedure used to create class maps for configuring QoS traffic policies. To configure the IGMP Static Group Range Support feature, you must perform the following:

  1. Create an IGMP static group class map.

  2. Define the group entries associated with the class map.

  3. Attach the class map to an interface.

Unlike QoS class maps, which are defined by specifying numerous match criteria, IGMP static group class maps are defined by specifying multicast groups entries (group addresses, group ranges, SSM channels, and SSM channel ranges). Also, IGMP static group range class maps are not configured in traffic policies. Rather, the ip ignmp static-group command has been extended to support IGMP static group ranges.

Once a class map is attached to an interface, all group entries defined in the class map become statically connected members on the interface and are added to the IGMP cache and IP multicast route (mroute) table.

General Procedure for Configuring IGMP Group Range Support

To configure the IGMP Static Group Range Support feature, you would complete the following procedure:

  1. Create an IGMP static group class map (using the class-map type multicast-flows command).

  2. Define the group entries associated with the class map (using the group command).

  3. Attach the class map to an interface (using the ip igmp static-group command).

The class-map type multicast-flows command is used to enter multicast-flows class map configuration mode to create or modify an IGMP static group class map.

Unlike QoS class maps, which are defined by specifying numerous match criteria, IGMP static group class maps are defined by specifying multicast groups entries (group addresses, group ranges, SSM channels, and SSM channel ranges). The following forms of the group command are entered from multicast-flows class map configuration mode to define group entries to associate with the class map:

  • group group-address

Defines a group address to be associated with an IGMP static group class map.

  • group group-address to group-address

Defines a range of group addresses to be associated with an IGMP static group class map.

  • group group-address source source-address

Defines an SSM channel to be associated with an IGMP static group class map.

  • group group-address to group-address source source-address

Defines a range of SSM channels to be associated with an IGMP static group class map.

Unlike QoS class maps, IGMP static group range class maps are not configured in traffic policies. Rather, the ip igmp static-group command has been extended to support IGMP static group ranges. After creating an IGMP static group class map, you can attach the class map to interfaces using the ip igmp static-group command with the class-map keyword and class-map-name argument. Once a class map is attached to an interface, all group entries defined in the class map become statically connected members on the interface and are added to the IGMP cache and IP multicast route (mroute) table.

Additional Guidelines for Configuring IGMP Static Group Range Support

  • Only one IGMP static group class map can be attached to an interface.

  • If an IGMP static group class map is modified (that is, if group entries are added to or removed from the class map using the group command), the group entries that are added to or removed from the IGMP static group class map are added to or deleted from the IGMP cache and the mroute table, respectively.

  • If an IGMP static group class map is replaced on an interface by another class map using the ip igmp static-group command, the group entries associated with old class map are removed, and the group entries defined in the new class map are added to the IGMP cache and mroute table.

  • The ip igmp static-group command accepts an IGMP static group class map for the class-map-name argument, regardless of whether the class map configuration exists. If a class map attached to an interface does not exist, the class map remains inactive. Once the class map is configured, all group entries associated with the class map are added to the IGMP cache and mroute table.

  • If a class map is removed from an interface using the no form of the ip igmp static-group command, all group entries defined in the class map are removed from the IGMP cache and mroute tables.

Benefits of IGMP Static Group Range Support

The IGMP Static Group Range Support feature provides the following benefits:

  • Simplifies the administration of devices that require many interfaces to be configured with many different ip igmp static-group command configurations by introducing the capability to configure group ranges in class maps and attach class maps to the ip igmp static-group command.

  • Reduces the number of commands required to administer devices that require many ip igmp static-group command configurations.

How to Configure IGMP Static Group Range Support

Configuring IGMP Static Group Range Support

Perform this task to create and define an IGMP static group class and attach the class to an interface.

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. class-map type multicast-flows class-map-name
  4. group group-address [to group-address ] [source source-address ]
  5. exit
  6. Repeat Steps 3 to 5 to create additional class maps.
  7. interface type number
  8. ip igmp static-group class-map class-map-name
  9. ip igmp static-group *
  10. end

DETAILED STEPS

  Command or Action Purpose
Step 1

enable

Example:


Device> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Device# configure terminal

Enters global configuration mode.

Step 3

class-map type multicast-flows class-map-name

Example:


Device(config)# class-map type multicast-flows static1

Enters multicast-flows class map configuration mode to create or modify an IGMP static group class map.

Step 4

group group-address [to group-address ] [source source-address ]

Example:


Device(config-mcast-flows-cmap)# group 232.1.1.7 to 232.1.1.20

Defines the group entries to be associated with the class map.

  • Repeat this step to associate additional group entires to the class map being configured.

Step 5

exit

Example:


Device(config-mcast-flows-cmap)# exit

Exits multicast-flows class-map configuration mode and returns to global configuration mode.

Step 6

Repeat Steps 3 to 5 to create additional class maps.

--

Step 7

interface type number

Example:


Device(config)# interface FastEthernet 0/1

Enters interface configuration mode.

Step 8

ip igmp static-group class-map class-map-name

Example:


Device(config-if)# ip igmp static-group class-map static1

Attaches an IGMP static group class map to the interface.

Step 9

ip igmp static-group *

Example:


Device(config-if)# ip igmp static-group *

(Optional) Places the interface into all created multicast route (mroute) entries.

  • Depending on your Cisco software release, this step is required if the interface of a last hop device does not have any PIM neighbors and does not have a receiver. See the ip igmp static-group command in the Cisco IOS IP Multicast Command Reference.

Step 10

end

Example:


Device(config-if)# end

Exits interface configuration mode, and enters privileged EXEC mode.

Verifying IGMP Static Group Range Support

Perform this optional task to verify the contents of IGMP static group class maps configurations, and to confirm that all group entries defined in class maps were added to the IGMP cache and the mroute table after you attached class maps to interfaces.

SUMMARY STEPS

  1. show ip igmp static-group class-map [interface [type number ]]
  2. show ip igmp groups [group-name | group-address | interface-type interface-number ] [detail ]
  3. show ip mroute

DETAILED STEPS

Step 1

show ip igmp static-group class-map [interface [type number ]]

Displays the contents of IGMP static group class maps and the interfaces using class maps.

The following is sample output from the show ip igmp static-group class-map command:

Example:


Device# show ip igmp static-group class-map

Class-map static1
  Group address range 228.8.8.7 to 228.8.8.9
  Group address 232.8.8.7, source address 10.1.1.10
  Interfaces using the classmap:
    Loopback0
Class-map static
  Group address range 232.7.7.7 to 232.7.7.9, source address 10.1.1.10
  Group address 227.7.7.7
  Group address range 227.7.7.7 to 227.7.7.9
  Group address 232.7.7.7, source address 10.1.1.10
  Interfaces using the classmap:
    FastEthernet3/1

The following is sample output from the show ip igmp static-group class-map command with the interface keyword:

Example:


Device# show ip igmp static-group class-map interface
 
Loopback0
  Class-map attached: static1
FastEthernet3/1
  Class-map attached: static

The following is sample output from the show ip igmp static-group class-map command with the interface keyword and type number arguments:

Example:


Device# show ip igmp static-group class-map interface FastEthernet 3/1

FastEthernet3/1
  Class-map attached: static
Step 2

show ip igmp groups [group-name | group-address | interface-type interface-number ] [detail ]

Displays the multicast groups with receivers that are directly connected to the device and that are learned through IGMP.

The following is sample output from the show ip igmp groups command:

Example:


device# show ip igmp groups

IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
232.7.7.7        FastEthernet3/1          00:00:09  stopped   0.0.0.0
232.7.7.9        FastEthernet3/1          00:00:09  stopped   0.0.0.0
232.7.7.8        FastEthernet3/1          00:00:09  stopped   0.0.0.0
227.7.7.7        FastEthernet3/1          00:00:09  stopped   0.0.0.0
227.7.7.9        FastEthernet3/1          00:00:09  stopped   0.0.0.0
227.7.7.8        FastEthernet3/1          00:00:09  stopped   0.0.0.0
224.0.1.40       FastEthernet3/2          01:44:50  00:02:09  10.2.2.5
224.0.1.40       Loopback0                01:45:22  00:02:32  10.3.3.4
Step 3

show ip mroute

Displays the contents of the mroute table.

The following is sample output from the show ip mroute command:

Example:


Device# show ip mroute

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode
(10.1.1.10, 232.7.7.7), 00:00:17/00:02:42, flags: sTI
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:17/00:02:42
(10.1.1.10, 232.7.7.9), 00:00:17/00:02:42, flags: sTI
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:17/00:02:42
(10.1.1.10, 232.7.7.8), 00:00:18/00:02:41, flags: sTI
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.7), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.9), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.8), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 224.0.1.40), 00:01:40/00:02:23, RP 10.2.2.6, flags: SJCL
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    Loopback0, Forward/Sparse-Dense, 00:01:40/00:02:23

Configuration Examples for IGMP Static Group Range Support

Example: Configuring IGMP Static Group Support

The following example shows how to configure a class map and attach the class map to an interface. In this example, a class map named static is configured and attached to FastEthernet interface 3/1. 


class-map type multicast-flows static
 group 227.7.7.7
 group 232.7.7.7 to 232.7.7.9 source 10.1.1.10
 group 232.7.7.7 source 10.1.1.10
 group 227.7.7.7 to 227.7.7.9
.
.
.
!
interface FastEthernet3/1
 ip address 192.168.1. 2 255.255.255.0
 ip pim sparse-dense-mode
 ip igmp static-group class-map static
!

Example: Verifying IGMP Static Group Support

The following is sample output from the show ip igmp static-group class-map command. In this example, the output displays the contents of the IGMP static group class map named static (the class map configured in the Example: Configuring IGMP Static Group Support section). 


Device# show ip igmp static-group class-map
 
Class-map static
  Group address range 227.7.7.7 to 227.7.7.9
  Group address 232.7.7.7, source address 10.1.1.10
  Group address range 232.7.7.7 to 232.7.7.9, source address 10.1.1.10
  Group address 227.7.7.7
  Interfaces using the classmap:
    FastEthernet3/1

The following is sample output from the show ip igmp groups command. In this example, the command is issued to confirm that the group entries defined in the class map named static (the class map configured in the Example: Configuring IGMP Static Group Support section) were added to the IGMP cache. 


Device# show ip igmp groups
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
232.7.7.7        FastEthernet3/1          00:00:09  stopped   0.0.0.0
232.7.7.9        FastEthernet3/1          00:00:09  stopped   0.0.0.0
232.7.7.8        FastEthernet3/1          00:00:09  stopped   0.0.0.0
227.7.7.7        FastEthernet3/1          00:00:09  stopped   0.0.0.0
227.7.7.9        FastEthernet3/1          00:00:09  stopped   0.0.0.0
227.7.7.8        FastEthernet3/1          00:00:09  stopped   0.0.0.0
224.0.1.40       FastEthernet3/2          01:44:50  00:02:09  10.2.2.5
224.0.1.40       Loopback0                01:45:22  00:02:32  10.3.3.4

The following is sample output from the show ip mroute command. In this example, the command is issued to confirm that the group entries defined in the class map named static (the class map configured in the Example: Configuring IGMP Static Group Support section) were added to the mroute table. 


Device# show ip mroute

IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode
(10.1.1.10, 232.7.7.7), 00:00:17/00:02:42, flags: sTI
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:17/00:02:42
(10.1.1.10, 232.7.7.9), 00:00:17/00:02:42, flags: sTI
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:17/00:02:42
(10.1.1.10, 232.7.7.8), 00:00:18/00:02:41, flags: sTI
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.5
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.7), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.9), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 227.7.7.8), 00:00:18/00:02:41, RP 10.2.2.6, flags: SJC
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    FastEthernet3/1, Forward/Sparse-Dense, 00:00:18/00:02:41
(*, 224.0.1.40), 00:01:40/00:02:23, RP 10.2.2.6, flags: SJCL
  Incoming interface: FastEthernet3/2, RPF nbr 10.2.2.6
  Outgoing interface list:
    Loopback0, Forward/Sparse-Dense, 00:01:40/00:02:23

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

IP multicast commands

Cisco IOS IP Multicast Command Reference

Standards and RFCs

Standard/RFC

Title

RFC 2933

Internet Group Management Protocol MIB

MIBs

MIB

MIBs Link

IGMP-MIB

To locate and download MIBs for selected platforms, Cisco IOS XE software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

Description

Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for IGMP Static Group Range Support

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1. Feature Information for IGMP Static Group Range Support

Feature Name

Releases

Feature Information

IGMP Static Group Range Support

12.2(18)SXF5

Cisco IOS XE Release 2.6

15.0(1)M

12.2(33)SRE

15.1(1)SG

Cisco IOS XE Release 3.3SG

The IGMP Static Group Range Support feature introduces the capability to configure group ranges in class maps and attach class maps to an interface. This feature is an enhancement that simplifies the administration of networks with devices that require static group membership entries on many interfaces.

The following commands were introduced or modified by this feature: class-map type multicast-flows , group (multicast-flows), ip igmp static-group , show ip igmp static-group class-map .

IGMP MIB Support Enhancements for SNMP

12.2(11)T

12.2(33)SRE

Cisco IOS XE Release 2.1

15.1(1)SG

12.2(50)SY

15.0(1)S

The Internet Group Management Protocol (IGMP) is used by IP hosts to report their multicast group memberships to neighboring multicast routers. The IGMP MIB describes objects that enable users to remotely monitor and configure IGMP using Simple Network Management Protocol (SNMP). It also allows users to remotely subscribe and unsubscribe from multicast groups. The IGMP MIB Support Enhancements for SNMP feature adds full support of RFC 2933 (Internet Group Management Protocol MIB) in Cisco IOS software.

There are no new or modfied commands for this feature.