Displaying and Maintaining IGMP 623
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■ If not statically configured, the other querier present interval is [ IGMP query
interval ] times [ IGMP robustness variable ] plus [ maximum response time for
IGMP general queries ] divided by two. By default, the values of these three
parameters are 60 (seconds), 2 and 10 (seconds) respectively, so the default
value of the other querier present interval = 60 × 2 + 10 / 2 = 125 (seconds).
■ If statically configured, the other querier present interval takes the configured
value.
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CAUTION:
■ Make sure that the other querier present interval is greater than the IGMP
query interval; otherwise the IGMP querier may change frequently on the
network.
■ Make sure that the IGMP query interval is greater than the maximum response
time for IGMP general queries; otherwise, multicast group members may be
wrongly removed.
■ The configurations of the maximum response time for IGMP general queries,
the IGMP last member query interval and the IGMP other querier present
interval are effective only for IGMPv2 or IGMPv3.
Configuring IGMP Fast
Leave Processing
Fast leave processing is implemented by IGMP Snooping. For details, see
“Configuring Fast Leave Processing” on page 562.
Displaying and
Maintaining IGMP
To do… Use the command… Description
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Configure IGMP query interval igmp timer query interval Optional
60 seconds by default
Configure the IGMP querier
robustness variable
igmp robust-count
robust-value
Optional
2 by default
Configure the maximum
response time for IGMP
general queries
igmp max-response-time
interval
Optional
10 seconds by default
Configure the IGMP last
member query interval
igmp
last-member-query-interval
interval
Optional
1 second by default
Configure the other querier
present interval
igmp timer
other-querier-present
interval
Optional
For the system default, see
“Note” below.
To do… Use the command… Description
View IGMP multicast group
information
display igmp group [ group-address |
interface interface-type
interface-number ] [ static | verbose ]
Available in any
view
View IGMP layer 2 port
information
display igmp group port-info [ vlan
vlan-id ] [ verbose ]
Available in any
view
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