Juniper JUNOS OS 10.3 - SOFTWARE, Manual

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Changing the IGMP Snooping Group Query Membership Timeout Value (CLI Procedure)
Generally, you do not need to explicitly set the group membership timeout value for IGMP
snooping groups on an EX Series switch. The group membership timeout value, which
determines how long the switch waits before removing an IGMP snooping group from
its multicast cache table. is implicitly set to 260 seconds when you configure IGMP
snooping.
When you enable IGMP snooping on a switch, the query-interval and
query-response-interval values are set to their default values and are applied to all VLANs
created on the switch. The default values are:
• query-interval —125 seconds
• query-response-interval —10 seconds
The software automatically calculates the group membership timeout value for an IGMP
snooping-enabled switch by multiplying the
query-interval
value by 2 and then adding
the
query-response-interval
value. For example, using the default values: (125 x 2) + 10)
= 260.
If you need to explicitly set the group membership timeout value, you reset the
query-interval
and
query-response-interval
values at the
[edit protocols igmp]
hierarchy
level. (Notice that you are not resetting the values at the
[edit protocols igmp-snooping]
hierarchy level.) When you reset these values, the IGMP snooping configuration inherits
the new values and recalculates the group membership timeout value accordingly. For
more information on changing these values, see the
Junos Multicast Protocols Configuration
Guide at http://www.juniper.net/techpubs/software/junos/index.html .
To change the IGMP snooping group membership timeout value to 350:
1.
Configure the
query-interval
value to be 150:
[edit protocols]
user@switch#
set igmp query-interval 150
2.
Configure the query-response-interval value to be 50:
[edit protocols]
user@switch#
set igmp query-response-interval 50
Related
Documentation
Example: Configuring IGMP Snooping on EX Series Switches on page 2323
•
•
Verifying That the IGMP Snooping Group Query Timeout Value Has Been Changed
Correctly on page 2340
•
Configuring IGMP Snooping (CLI Procedure) on page 2331
•
Configuring IGMP Snooping (J-Web Procedure) on page 2332
2335 Copyright © 2010, Juniper Networks, Inc.
Chapter 77: Configuring IGMP Snooping and Multicast