Default Igmp Version; Compatibility With Igmp V1 And V2; Enabling The Igmp Version Per Interface Setting - Dell PowerConnect B-RX Configuration Manual

Default IGMP version

IGMP V3 is available for device Switches running software release 02.6.00 and later; however,
these routers are shipped with IGMP V2-enabled. You must enable IGMP V3 globally or per
interface.
Also, you can specify what version of IGMP you want to run on a device globally, on each interface
(physical port or virtual routing interface), and on each physical port within a virtual routing
interface. If you do not specify an IGMP version, IGMP V2 will be used.

Compatibility with IGMP V1 and V2

Different multicast groups, interfaces, and routers can run their own version of IGMP. Their version
of IGMP is reflected in the membership reports that the interfaces send to the router. Routers and
interfaces must be configured to recognized the version of IGMP you want them to process.
An interface or router sends the queries and reports that include its IGMP version specified on it. It
may recognize a query or report that has a different version. For example, an interface running
IGMP V2 can recognize IGMP V3 packets, but cannot process them. Also, a router running IGMP V3
can recognize and process IGMP V2 packet, but when that router sends queries to an IGMP V2
interface, the downgraded version is supported, no the upgraded version.
If an interface continuously receives queries from routers that are running versions of IGMP that
are different from what is on the interface, the interface logs warning messages in the syslog every
five minutes. Reports sent by interfaces to routers that contain different versions of IGMP do not
trigger warning messages; however, you can see the versions of the packets using the show ip igmp
traffic command.
The version of IGMP can be specified globally, per interface (physical port or virtual routing
interface), and per physical port within a virtual routing interface. The IGMP version set on a
physical port within a virtual routing interface supersedes the version set on a physical or virtual
routing interface. Likewise, the version on a physical or virtual routing interface supersedes the
version set globally on the device. The sections below present how to set the version of IGMP.
Globally enabling the IGMP version
To globally identify the IGMP version on a Brocade device, enter the following command.
BigIron RX(config)# ip igmp version 3
Syntax: ip igmp version <version-number>
Enter 1, 2, or 3 for <version-number>. Version 2 is the default version.

Enabling the IGMP version per interface setting

To specify the IGMP version for a physical port, enter a command such as the following.
BigIron RX(config)# interface eth 1/5
BigIron RX(config-if-1/5)# ip igmp version 3
To specify the IGMP version for a virtual routing interface on a physical port, enter a command such
as the following.
BigIron RX(config)# interface ve 3
BigIron RX(config-vif-1) ip igmp version 3
BigIron RX Series Configuration Guide
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IGMP v3
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