Configuring The Source Ip Addresses For Igmp Queries - H3C S5500-EI Configuration Manual
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- Operation manual (1529 pages) ,
- Configuration manual (457 pages) ,
- Security configuration manual (448 pages)
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A multicast listening host starts a timer for each multicast group that it has joined when it receives an
IGMP query (general query or group-specific query). This timer is initialized to a random value in the
range of 0 to the maximum response delay 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 properly set the maximum response delay.
•
The maximum response delay for IGMP general queries is set by the max-response-time command.
The maximum response delay for IGMP group-specific queries equals the IGMP last-member query
•
interval.
Configuring the global parameters for IGMP queries and responses
Step
1.
Enter system view.
2.
Enter IGMP-snooping view.
3.
Set the maximum response
delay for IGMP general
queries.
4.
Set the IGMP last-member
query interval.
Configuring the parameters for IGMP queries and responses in a VLAN
Step
1.
Enter system view.
2.
Enter VLAN view.
3.
Set the interval for sending
IGMP general queries.
4.
Set the maximum response
delay for IGMP general
queries.
5.
Set the IGMP last-member
query interval.
Configuring the source IP addresses for IGMP queries
After the switch receives an IGMP query whose source IP address is 0.0.0.0 on a port, it does not enlist
that port as a dynamic router port. This might prevent multicast forwarding entries from being correctly
created at the data link layer and eventually cause multicast traffic forwarding to fail. To avoid this
problem, when a Layer 2 switch acts as the IGMP snooping querier, H3C recommends you to configure
a non-all-zero IP address as the source IP address of IGMP queries.
Command
system-view
igmp-snooping
max-response-time interval
last-member-query-interval interval
Command
system-view
vlan vlan-id
igmp-snooping query-interval interval
igmp-snooping max-response-time interval
igmp-snooping
last-member-query-interval interval
30
Remarks
N/A
N/A
10 seconds by default
1 second by default
Remarks
N/A
N/A
60 seconds by default
10 seconds by default
1 second by default
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