R21xx-HP FlexFabric 11900 IP Multicast Configuration Guide

19
Setting the maximum number of IGMP snooping forwarding
entries
You can modify the maximum number of IGMP snooping forwarding entries. When the number of
forwarding entries on the device reaches the upper limit, the device does not automatically remove any
existing entries or create new entries until some entries time out or are removed. In this case, HP
recommends that you manually remove the excessive entries.
To set the maximum number of IGMP snooping forwarding entries:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP-snooping view.
igmp-snooping
N/A
3. Set the maximum number of
IGMP snooping forwarding
entries.
entry-limit limit
The default setting is
4294967295.
Configuring parameters for IGMP queries and responses
When a multicast listening host receives an IGMP query (general query or group-specific query), it starts
a timer for each multicast group that it has joined. This timer is initialized to a random value in the range
of 0 to the maximum response time advertised in the IGMP query message. When the timer value
decreases to 0, the host sends an IGMP report to the multicast group.
To speed up the response of hosts to IGMP queries and avoid simultaneous timer expirations causing
IGMP report traffic bursts, you must correctly set the maximum response time.
• The maximum response time for IGMP general queries is set by the max-response-time command.
• The maximum response time for IGMP group-specific queries is the same as the IGMP last-member
query interval, which is set by the last-member-query-interval command.
You can configure parameters for IGMP queries and responses either for the current VLAN in VLAN view
or globally for all VLANs in IGMP-snooping view. If the two configurations are made in both VLAN view
and IGMP-snooping view, the configuration made in VLAN view takes priority.
Configuring parameters for IGMP queries and responses globally
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP-snooping view.
igmp-snooping N/A
3. Set the maximum response
time for IGMP general
queries.
max-response-time interval The default setting is 10 seconds.