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188 CHAPTER 2: CUDA 12000 BASE SYSTEM COMMANDS

Example 1

In this example, the multicast group 225.2.2.1 is joined on interface 1/3/1:

cli:192.168.208.3:interface:ethernet:csi(1/3/1)# ip igmp join-group 225.2.2.1

cli:192.168.208.3:interface:ethernet:csi(1/3/1)#

Example 2

In this example, the user configures interface 1/3/1 for IGMP Version 2 only:

cli:192.168.208.3:interface:ethernet:csi(1/3/1)# ip igmp version v2_only

cli:192.168.208.3:interface:ethernet:csi(1/3/1)#

Related Commands

■ no ip igmp on page 271

■ show ip {mroute | igmp} on page 439

router Enables the interface to function as an IGMP Querier (router).

For the DOCSIS module, the default is router.

Use the no igmp router command to disable the IGMP Querier

capability on the interface. This causes the interface to function

as an IGMP host.

If multiple routers attempt to become the IGMP Querier, the one

with the lowest IP address becomes the querier. When you

change an interface from a querier to a host, any multicast

groups that are learned are removed. When you change the

interface from a host to a querier, or from a querier to a host,

any multicast groups joined locally or by an application running

on the Cuda 12000 remain.

Note: The DOCSIS module can only be configured as an IGMP

querier (router). All other interfaces default to IGMP hosts.

last-query-interval

(Does not apply

to IGMP Version 1)

Specifies the number of seconds between queries to find other

hosts on the network that want to receive traffic from the

multicast group. You can tune this parameter to modify the

leave latency of the network. A reduced value results in reduced

time to detect the loss of the last member of a group. The

default is 1 and the range is 1 to 25 seconds.