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Chapter 24 Multicast Routing Configuration
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<access-list-number>] command in interface configuration
mode as shown in Table 381.
T
A B L E
3 8 1 I
P
I
G M P
I
M M E D I A T E
Command
Format Command
Mode
Command Function
ip igmp
immediate-
leave
[group-list
<access-list-
number>]
Interface config
This configuration removes a
group immediately when that
group falls into the group
allowing range.
Result: This configuration removes a group immediately
when that group falls into the group allowing range. ..
E
ND OF STEPS
Configuring IGMP Timer
After booting the IGMP on the multicast router interface
connected with the shared network segment, select the optimum
one as the Querier of the network segment, responsible for
sending the query message to obtain the information of group
members.
After sending query messages, the Querier will wait for the
member report of the receiving host for some time. The duration
is the max response time value carried when sending query
messages. The default value is 10 seconds.
Upon receiving query messages, the host member on the
network segment will reduce a random deviation value based on
the maximum response time, and take the result as its own
response time. During the period, if the report of another host
member is received, the host member will cancel it; if not, the
host member will send the host report at the right time.
Therefore, prolonging the max response time will accordingly
increase the waiting chances for the group members of the
network segment, and spare down the burst rate of multiple
host reports on the network segment.
According to the actual network conditions, appropriately adjust
parameter values of several timers related to the Querier.
Below procedure gives information about configuring IGMP timer.
Router Command Line Interface has been accessed.
1. To configure the IGMP query time interval, use
ip igmp
query-interval <seconds> command in interface
configuration mode as shown in Table 382.
Introduction
Query
Messages
Maximum
Response Time
Purpose
Prerequisite
Steps