- Preface
- New and Changed Information
- Overview
- Configuring VLANs
- Configuring Private VLANs
- Configuring Access and Trunk Interfaces
- Configuring Enhanced Virtual Port Channels
- Configuring Rapid PVST+
- Configuring Multiple Spanning Tree
- Configuring STP Extensions
- Configuring Flex Links
- Configuring LLDP
- Configuring MAC Address Tables
- Configuring IGMP Snooping
- Configuring MVR
- Configuring Traffic Storm Control
- Configuring the Fabric Extender
- Index
Configuring MVR
This chapter contains the following sections:
- Information About MVR
- Licensing Requirements for MVR
- Guidelines and Limitations for MVR
- Default MVR Settings
- Configuring MVR
- Verifying the MVR Configuration
Information About MVR
MVR Overview
In a typical Layer 2 multi-VLAN network, subscribers to a multicast group can be on multiple VLANs. To maintain data isolation between these VLANs, the multicast stream on the source VLAN must be passed to a router, which replicates the stream on all subscriber VLANs, wasting upstream bandwidth.
Multicast VLAN Registration (MVR) allows a Layer 2 switch to forward the multicast data from a source on a common assigned VLAN to the subscriber VLANs, conserving upstream bandwidth by bypassing the router. The switch forwards multicast data for MVR IP multicast streams only to MVR ports on which hosts have joined, either by IGMP reports or by MVR static configuration. The switch forwards IGMP reports received from MVR hosts only to the source port. For other traffic, VLAN isolation is preserved.
MVR requires at least one VLAN to be designated as the common VLAN to carry the multicast stream from the source. More than one such multicast VLAN (MVR VLAN) can be configured in the system, and you can configure a global default MVR VLAN as well as interface-specific default MVR VLANs. Each multicast group using MVR is assigned to an MVR VLAN.
MVR allows a subscriber on a port to subscribe and unsubscribe to a multicast stream on the MVR VLAN by sending IGMP join and leave messages. IGMP leave messages from an MVR group are handled according to the IGMP configuration of the VLAN on which the leave message is received. If IGMP fast leave is enabled on the VLAN, the port is removed immediately; otherwise, an IGMP query is sent to the group to determine whether other hosts are present on the port.
MVR Interoperation with Other Features
MVR and IGMP Snooping
Although MVR operates on the underlying mechanism of IGMP snooping, the two features operate independently of each other. One feature can be enabled or disabled without affecting the operation of the other feature. If IGMP snooping is disabled globally or on a VLAN, and if MVR is enabled on the VLAN, IGMP snooping is internally enabled on the VLAN. Joins received for MVR groups on non-MVR receiver ports, or joins received for non-MVR groups on MVR receiver ports, are processed by IGMP snooping.
MVR and vPC
-
As with IGMP snooping, IGMP control messages received by virtual port channel (vPC) peer switches are exchanged between the peers, allowing synchronization of MVR group information.
-
MVR configuration must be consistent between the peers.
-
The no ip igmp snooping mrouter vpc-peer-link command applies to MVR. With this command, multicast traffic is not sent over to a peer link for the source VLAN and receiver VLAN unless there is an orphan port in the VLAN.
-
The show mvr member command shows the multicast group on the vPC peer switch. However, the vPC peer switch does not show the multicast groups if it does not receive the IGMP membership report of the groups.
Licensing Requirements for MVR
The following table shows the licensing requirements for this feature:
| Product | License Requirement |
|---|---|
Cisco NX-OS |
This feature does not require a license. Any feature not included in a license package is bundled with the Cisco NX-OS system images and is provided at no extra charge to you. For a complete explanation of the Cisco NX-OS licensing scheme, see the Cisco NX-OS Licensing Guide. |
Guidelines and Limitations for MVR
When configuring MVR, follow these guidelines:
MVR is supported only on Layer 2 Ethernet ports, such as individual ports, port channels, and virtual Ethernet (vEth) ports.
MVR receiver ports can only be access ports; they cannot be trunk ports. MVR source ports can be either access or trunk ports.
MVR configuration on Flex Link ports is not supported.
Priority tagging is not supported on MVR receiver ports.
When using private VLANs (PVLANs), you cannot configure a secondary VLAN as the MVR VLAN.
The total number of MVR VLANs cannot exceed 250.
 Note | During and in-service software upgrade ( ISSU), MVR IGMP membership for the MVR receiver ports may timeout because the joins are not forwarded to the upstream router. In order to avoid a timeout, the querier timer on the upstream router or the network querier should be increased to accommodate an ISSU. |
Default MVR Settings
| Parameter | Default |
|---|---|
| MVR | Disabled globally and per interface |
| Global MVR VLAN | None configured |
| Interface (per port) default | Neither a receiver nor a source port |
Configuring MVR
Configuring MVR Global Parameters
1. switch# configure terminal
2. switch(config)# [no] mvr
3. switch(config)# [no] mvr-vlan vlan-id
4. switch(config)# [no] mvr-group addr[/mask] [count groups] [vlan vlan-id]
5. (Optional) switch(config)# end
6. (Optional) switch# clear mvr counters [source-ports | receiver-ports]
7. (Optional) switch# show mvr
8. (Optional) switch# copy running-config startup-config
DETAILED STEPS
This example shows how to globally enable MVR and configure the global parameters:
switch# configure terminal switch(config)# mvr switch(config-mvr)# mvr-vlan 100 switch(config-mvr)# mvr-group 192.0.2.1 count 4 switch(config-mvr)# mvr-group 192.0.2.240/28 vlan 101 switch(config-mvr)# mvr-group 192.0.2.6 vlan 340 switch(config-mvr)# end switch# show mvr MVR Status : enabled Global MVR VLAN : 100 Number of MVR VLANs : 3 switch# copy running-config startup-config
Configuring MVR Interfaces
1. switch# configure terminal
2.
mvr
3.
interface {ethernet
type
slot/port |
port-channel
channel-number |
vethernet
number}
4.
[no]
mvr-type {source |
receiver}
5.
(Optional)
[no]
mvr-vlan
vlan-id
6.
(Optional)
[no]
mvr-group
addr[/mask] [vlan
vlan-id]
7.
(Optional)
end
8. (Optional) switch# copy running-config startup-config
DETAILED STEPS
This example shows how to configure an Ethernet port as an MVR receiver port:
switch# configure terminal switch(config)# mvr switch(config-mvr)# interface ethernet 1/10 switch(config-if)# mvr-type receiver switch(config-if)# end switch# copy running-config startup-config switch#
Verifying the MVR Configuration
Use the following commands to verify the MVR configuration:
|
Command |
Description |
|---|---|
| show mvr |
Displays the MVR subsystem configuration and status. |
| show mvr groups |
Displays the MVR group configuration. |
| show ip igmp snooping [vlan vlan-id] |
Displays information about IGMP snooping on the specified VLAN. |
| show mvr interface {ethernet type slot/port | port-channel number} |
Displays the MVR configuration on the specified interface. |
| show mvr members [count] |
Displays the number and details of all MVR receiver members. |
| show mvr members interface {ethernet type slot/port | port-channel number} |
Displays details of MVR members on the specified interface. |
| show mvr members vlan vlan-id |
Displays details of MVR members on the specified VLAN. |
| show mvr receiver-ports [ethernet type slot/port | port-channel number] |
Displays all MVR receiver ports on all interfaces or on the specified interface. |
| show mvr source-ports [ethernet type slot/port | port-channel number] |
Displays all MVR source ports on all interfaces or on the specified interface. |
This example shows how to verify the MVR parameters:
switch# show mvr MVR Status : enabled Global MVR VLAN : 100 Number of MVR VLANs : 4
This example shows how to verify the MVR group configuration:
switch# show mvr groups
* - Global default MVR VLAN.
Group start Group end Count MVR-VLAN Interface
Mask
------------- --------------- ------ -------- -----------
228.1.2.240 228.1.2.255 /28 101
230.1.1.1 230.1.1.4 4 *100
235.1.1.6 235.1.1.6 1 340
225.1.3.1 225.1.3.1 1 *100 Eth1/10
This example shows how to verify the MVR interface configuration and status:
switch# show mvr interface Port VLAN Type Status MVR-VLAN ---- ---- ---- ------ -------- Po10 100 SOURCE ACTIVE 100-101 Po201 201 RECEIVER ACTIVE 100-101,340 Po202 202 RECEIVER ACTIVE 100-101,340 Po203 203 RECEIVER ACTIVE 100-101,340 Po204 204 RECEIVER INACTIVE 100-101,340 Po205 205 RECEIVER ACTIVE 100-101,340 Po206 206 RECEIVER ACTIVE 100-101,340 Po207 207 RECEIVER ACTIVE 100-101,340 Po208 208 RECEIVER ACTIVE 2000-2001 Eth1/9 340 SOURCE ACTIVE 340 Eth1/10 20 RECEIVER ACTIVE 100-101,340 Eth2/2 20 RECEIVER ACTIVE 100-101,340 Eth102/1/1 102 RECEIVER ACTIVE 100-101,340 Eth102/1/2 102 RECEIVER INACTIVE 100-101,340 Eth103/1/1 103 RECEIVER ACTIVE 100-101,340 Eth103/1/2 103 RECEIVER ACTIVE 100-101,340 Status INVALID indicates one of the following misconfiguration: a) Interface is not a switchport. b) MVR receiver is not in access, pvlan host or pvlan promiscuous mode. c) MVR source is in fex-fabric mode.
This example shows how to display all MVR members:
switch# show mvr members MVR-VLAN Group Address Status Members -------- ------------- ------- ------- 100 230.1.1.1 ACTIVE Po201 Po202 Po203 Po205 Po206 100 230.1.1.2 ACTIVE Po205 Po206 Po207 Po208 340 235.1.1.6 ACTIVE Eth102/1/1 101 225.1.3.1 ACTIVE Eth1/10 Eth2/2 101 228.1.2.241 ACTIVE Eth103/1/1 Eth103/1/2
This example shows how to display all MVR receiver ports on all interfaces:
switch# show mvr receiver-ports
Port MVR-VLAN Status Joins Leaves
(v1,v2,v3)
------------ -------- -------- ------------ ------------
Po201 100 ACTIVE 8 2
Po202 100 ACTIVE 8 2
Po203 100 ACTIVE 8 2
Po204 100 INACTIVE 0 0
Po205 100 ACTIVE 10 6
Po206 100 ACTIVE 10 6
Po207 100 ACTIVE 5 0
Po208 100 ACTIVE 6 0
Eth1/10 101 ACTIVE 12 2
Eth2/2 101 ACTIVE 12 2
Eth102/1/1 340 ACTIVE 16 15
Eth102/1/2 340 INACTIVE 16 16
Eth103/1/1 101 ACTIVE 33 0
Eth103/1/2 101 ACTIVE 33 0
This example shows how to display all MVR source ports on all interfaces:
switch# show mvr source-ports Port MVR-VLAN Status ------------ -------- -------- Po10 100 ACTIVE Eth1/9 340 ACTIVE
Feedback