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IGMP V3 3<br />
Compatibility with IGMP V1 and V2<br />
Different multicast groups, interfaces, and routers can run their own version of IGMP. Their version<br />
of IGMP is reflected in the membership reports that the interfaces send to the router. Routers and<br />
interfaces must be configured to recognized the version of IGMP you want them to process.<br />
An interface or router sends the queries and reports that include its IGMP version specified on it. It<br />
may recognize a query or report that has a different version. For example, an interface running<br />
IGMP V2 can recognize IGMP V3 packets, but cannot process them. Also, a router running IGMP V3<br />
can recognize and process IGMP V2 packet, but when that router sends queries to an IGMP V2<br />
interface, the downgraded version is supported, no the upgraded version.<br />
If an interface continuously receives queries from routers that are running versions of IGMP that<br />
are different from what is on the interface, the interface logs warning messages in the syslog every<br />
five minutes. Reports sent by interfaces to routers that contain different versions of IGMP do not<br />
trigger warning messages; however, you can see the versions of the packets using the show ip igmp<br />
traffic command.<br />
The version of IGMP can be specified globally, per interface (physical port or virtual routing<br />
interface), and per physical port within a virtual routing interface. The IGMP version set on a<br />
physical port within a virtual routing interface supersedes the version set on a physical or virtual<br />
routing interface. Likewise, the version on a physical or virtual routing interface supersedes the<br />
version set globally on the device. The sections below present how to set the version of IGMP.<br />
Globally enabling the IGMP version<br />
To globally identify the IGMP version on a <strong>Brocade</strong> device, enter the following command.<br />
<strong>Brocade</strong>(config)# ip igmp version 3<br />
Syntax: [no] ip igmp version version-number<br />
Enter 1, 2, or 3 for version-number. Version 2 is the default version.<br />
Enabling the IGMP version per interface setting<br />
To specify the IGMP version for a physical port, enter a command such as the following.<br />
<strong>Brocade</strong>(config)# interface eth 1/5<br />
<strong>Brocade</strong>(config-if-1/5)# ip igmp version 3<br />
To specify the IGMP version for a virtual routing interface on a physical port, enter a command such<br />
as the following.<br />
<strong>Brocade</strong>(config)# interface ve 3<br />
<strong>Brocade</strong>(config-vif-1) ip igmp version 3<br />
Syntax: [no] ip igmp version version-number<br />
Enter 1, 2, or 3 for version-number. Version 2 is the default version.<br />
Enabling the IGMP version on a physical port within a virtual routing interface<br />
To specify the IGMP version recognized by a physical port that is a member of a virtual routing<br />
interface, enter a command such as the following.<br />
FastIron Ethernet Switch IP Multicast Configuration Guide 137<br />
53-1002638-02