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3
Changing global IP multicast parameters
Changing IGMP V1 and V2 parameters
IGMP allows Brocade devices to limit the multicast of IGMP packets to only those ports on the
device that are identified as IP Multicast members.
The device 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:
• IGMP query interval – Specifies how often the Brocade device queries an interface for group
membership. Possible values are 2 – 3600. The default is 125.
• IGMP group membership time – Specifies how many seconds an IP Multicast group can remain
on a Brocade device interface in the absence of a group report. Possible values are 5 –
26000. The default is 260.
• IGMP maximum response time – Specifies how many seconds the Brocade device 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 – 25. The
default is 10.
Modifying IGMP (V1 and V2) query interval period
The IGMP query interval period defines how often a device will query an interface for group
membership. Possible values are 2 – 3600 seconds and the default value is 125 seconds.
To modify the default value for the IGMP (V1 and V2) query interval, enter the following.
Brocade(config)# ip igmp query-interval 120
Syntax: [no] ip igmp query-interval num
The num variable specifies the number of seconds and can be a value from 2 - 3600.
The default value is 125.
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 5 – 26000 seconds and the default value is 260
seconds.
To define an IGMP (V1 and V2) membership time of 240 seconds, enter the following.
Brocade(config)# ip igmp group-membership-time 240
Syntax: [no] ip igmp group-membership-time num
The num variable specifies the number of seconds and can be a value from 5 - 26000.
The default value is 260.
Modifying IGMP (V1 and V2) maximum response time
Maximum response time defines how long the Brocade device 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 – 25. The default is 10.
64 FastIron Ethernet Switch IP Multicast Configuration Guide
53-1002638-02