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PowerConnect B-Series FCX Configuration Guide 771
53-1002266-01
IGMP V3
25
Default IGMP version
IGMP V3 is available on Dell PowerConnect devices; however, the devices are shipped with IGMP
V2 enabled. You must enable IGMP V3 globally or per interface.
Also, you must 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, but it may not process them. 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 host on that interface may not recognize the IGMP V3
queries. The interface or router does not automatically downgrade the IGMP version running on
them to avoid version deadlock.
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
Using the CLI
To globally identify the IGMP version on a Dell PowerConnect device, enter the following command.
PowerConnect(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.
PowerConnect(config)#interface eth 1/5
PowerConnect(config-if-1/5)#ip igmp version 3