H3C Technologies H3C S12500-X Series Switches - Manual (Page 30)

20
Step Command Remarks
3. Specify the IGMP snooping
version for the specified
VLANs
version version-number vlan vlan-list
The default setting is IGMPv2
snooping.
To specify the IGMP snooping version for a VLAN in VLAN view:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VLAN view. vlan vlan-id N/A
3. Specify the version of IGMP
snooping.
igmp-snooping version
version-number The default setting is IGMPv2
snooping.
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, H3C
recommends that you manually remove the excessive entries.
To set the maximum number of IGMP snooping forwarding entries:
Step 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.