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IGMP V3 3
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.
Brocade(config)# ip igmp version 3
Syntax: [no] 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.
Brocade(config)# interface eth 1/5
Brocade(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.
Brocade(config)# interface ve 3
Brocade(config-vif-1) ip igmp version 3
Syntax: [no] ip igmp version version-number
Enter 1, 2, or 3 for version-number. Version 2 is the default version.
Enabling the IGMP version on a physical port within a virtual routing interface
To specify the IGMP version recognized by a physical port that is a member of a virtual routing
interface, enter a command such as the following.
FastIron Ethernet Switch IP Multicast Configuration Guide 137
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