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Configuring IP Multicast Protocols
December 2005
© Foundry Networks, Inc.
19 - 5
Changing IGMP V1 and V2 Parameters
IGMP allows Foundry routers to limit the multicast of IGMP packets to only those ports on the router that are
identified as IP Multicast members. This section applies to Foundry devices that support IGMP versions 1 and 2.
The router actively sends out host queries to identify IP Multicast groups on the network, inserts the group
information in an IGMP packet, and forwards the packet to IP Multicast neighbors.
The following IGMP V1 and V2 parameters apply to PIM and DVMRP:
•
IGMP query interval – Specifies how often the Layer 3 Switch queries an interface for group membership.
Possible values are 1 – 3600. The default is 60.
•
IGMP group membership time – Specifies how many seconds an IP Multicast group can remain on a Layer 3
Switch interface in the absence of a group report. Possible values are 1 – 7200. The default is 60.
•
IGMP maximum response time – Specifies how many seconds the Layer 3 Switch will wait for an IGMP
response from an interface before concluding that the group member on that interface is down and removing
the interface from the group. Possible values are 1 – 10. The default is 5.
To change these parameters, you must first enable IP multicast routing by entering the following CLI command at
the global CLI level:
FastIron SuperX Router(config)# ip multicast-routing
Syntax:
[no] ip multicast-routing
NOTE:
You must enter the
ip multicast-routing
command before changing the global IP Multicast parameters.
Otherwise, the changes do not take effect and the software uses the default values.
Modifying IGMP (V1 and V2) Query Interval Period
The IGMP query interval period defines how often a router will query an interface for group membership. Possible
values are
1 – 3,600 seconds and the default value is 60 seconds.
To modify the default value for the IGMP (V1 and V2) query interval, enter the following:
FastIron SuperX Router(config)# ip igmp query 120
Syntax:
ip igmp query-interval <1-3600>
Modifying IGMP (V1 and V2) Membership Time
Group membership time defines how long a group will remain active on an interface in the absence of a group
report. Possible values are from 1 – 7200 seconds and the default value is 140 seconds.
To define an IGMP (V1 and V2) membership time of 240 seconds, enter the following:
FastIron SuperX Router(config)# ip igmp group-membership-time 240
Syntax:
ip igmp group-membership-time <1-7200>
Modifying IGMP (V1 and V2) Maximum Response Time
Maximum response time defines how long the Layer 3 Switch will wait for an IGMP (V1 and V2) response from an
interface before concluding that the group member on that interface is down and removing the interface from the
group. Possible values are 1 – 10. The default is 5.
To change the IGMP (V1 and V2) maximum response time, enter a command such as the following at the global
CONFIG level of the CLI:
FastIron SuperX Router(config)# ip igmp max-response-time 8
Syntax:
[no] ip igmp max-response-time <num>
The <num> parameter specifies the number of seconds and can be a value from 1 – 10. The default is 5.
Summary of Contents for FastIron Edge Switch X424
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