Enabling The Igmp Snooping Querier; Configuring Parameters For Igmp General Queries And Responses - HP FlexFabric 5950 series Configuration Manual

Enabling the IGMP snooping querier

This feature enables the device to periodically send IGMP general queries to establish and maintain
multicast forwarding entries at the data link Layer. You can configure an IGMP snooping querier on a
network without Layer 3 multicast devices.
Configuration restrictions and guidelines
When you enable the IGMP snooping querier, follow these restrictions and guidelines:
•
Do not enable the IGMP snooping querier on a multicast network that runs IGMP. An IGMP
snooping querier does not take part in IGMP querier elections. However, it might affect IGMP
querier elections if it sends IGMP general queries with a low source IP address.
•
On a VXLAN network, the IGMP snooping querier in a VSI does not include VLAN tags in IGMP
general queries. As a best practice, do not enable the IGMP snooping querier in a VSI if the VSI
uses the Ethernet access mode. For more information about the Ethernet access mode,
see VXLAN Configuration Guide.
Configuration procedure
To enable the IGMP snooping querier for a VLAN or VSI:
Step
1. Enter system view.
2. Enter VLAN view or VSI
view.
3. Enable the IGMP snooping
querier.
Configuring parameters for IGMP general queries and
responses
CAUTION:
To avoid mistakenly deleting multicast group members, make sure the IGMP general query interval
is greater than the maximum response time for IGMP general queries.
You can modify the IGMP general query interval for a VLAN or VSI based on the actual condition of
the network.
A receiver host starts a report delay timer for each multicast group that it has joined when it receives
an IGMP general query. This timer is set to a random value in the range of 0 to the maximum
response time advertised in the query. When the timer value decreases to 0, the host sends an IGMP
report to the corresponding multicast group.
Set an appropriate value for the maximum response time for IGMP general queries to speed up
hosts' responses to IGMP general queries and avoid IGMP report traffic bursts.
You can set the maximum response time for IGMP general queries globally for all VLANs and VSIs in
IGMP-snooping view, for a VSI in VSI view, or for a VLAN in VLAN view. For a VSI, the VSI-specific
configuration takes priority over the global configuration. For a VLAN, the VLAN-specific
configuration takes priority over the global configuration.
Command
system-view
•
Enter VLAN view:
vlan vlan-id
•
Enter VSI view:
vsi vsi-name
igmp-snooping querier
26
Remarks
N/A
N/A
By default, the IGMP snooping
querier is disabled.