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Ste
Command
Remarks
3. Configure the maximum
number of multicast groups
that the interface can join.
igmp group-limit limit 2000 by default.
NOTE:
This configuration takes effect for dynamically joined multicast groups but not for statically configured
multicast groups.
Adjusting IGMP performance
For the configuration tasks described in this section:
• The configuration in IGMP view is effective on all interfaces, whereas the configuration in interface
view is effective only on the current interface.
• If the same feature is configured in both IGMP view and interface view, the configuration in
interface view is given priority, regardless of the configuration sequence.
Configuration prerequisites
Before adjusting IGMP performance, complete the following tasks:
• Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer.
• Configure basic IGMP functions.
• Determine the startup query interval.
• Determine the startup query count.
• Determine the IGMP general query interval.
• Determine the IGMP querier's robustness variable.
• Determine the maximum response time for IGMP general queries.
• Determine the IGMP last-member query interval.
• Determine the other querier present interval.
• Determine the DSCP value for IGMP messages.
Configuring Router-Alert option handling methods
IGMP queries include group-specific queries and group-and-source-specific queries, and multicast
groups change dynamically, so a device cannot maintain the information for all multicast sources and
groups. For this reason, when an IGMP router receives a multicast packet but cannot locate the outgoing
interface for the destination multicast group, it must use the Router-Alert option to pass the multicast
packet to the upper-layer protocol for processing. For more information about the Router-Alert option, see
RFC 2113.
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