Specifying Igmp Snooping Mode; Enabling Igmp Rate Limiting - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Configuring IGMP Snooping

Specifying IGMP Snooping Mode

IGMP snooping runs in teither IGMP-only mode or IGMP-CGMP mode. The switch dynamically
chooses either IGMP-only or IGMP-CGMP mode, depending on the traffic present on the network.
IGMP-only mode is used in networks with no CGMP devices. IGMP-CGMP mode is used in networks
with both IGMP and CGMP devices. Auto mode overrides the dynamic switching of the modes.
To specify the IGMP snooping mode, perform this task in privileged mode:
Task
Step 1 Specifies the IGMP snooping mode.
Step 2 Displays the IGMP snooping mode.
This example shows how to set the IGMP mode to IGMP-only and verify the configuration:
Console> (enable) set igmp mode igmp-only
IGMP mode set to igmp-only
Console> (enable) show igmp mode
IGMP Mode:
IGMP Operational Mode:
IGMP Address Aliasing Mode: normal
Console> (enable)

Enabling IGMP Rate Limiting

IGMP rate limiting is disabled by default and the default rate limit is 100 packets per 30 seconds for all
packet types. Valid rate-limit values are from 1 to 65535 packets per 30 seconds.
If IGMP rate limiting and multicast are enabled, multicast router ports might age out sporadically
Note
because the rate of the multicast control packets (such as PIMv2 hellos or IGMP general queries)
exceeds the IGMP rate limit watermarks that were configured. The default value for these
watermarks is 100. We recommend that you increase the PIMv2 hello ratelimit to 3000 by entering
the set igmp ratelimit pimv2 3000 command. You can also increase the IGMP general queries rate
limit; we recommend that you set the value to 500 by entering the set igmp ratelimit
general-query 500 command.
To enable IGMP rate limiting and set the rate limit for IGMP snooping packets, perform this task in
privileged mode:
Task
Enable IGMP rate limiting and set a rate limit for
IGMP snooping packets.
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
40-8
Command
set igmp mode {igmp-only | igmp-cgmp | auto}
show igmp mode
igmp-only
igmp-only
Command
set igmp ratelimit {enable | disable}
set igmp ratelimit {dvmrp | general-query |
mospf1 | mospf2 | pimv2} rate
Chapter 40 Configuring Multicast Services
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