Download complete user manual (PDF). - Brocade

Adding an interface to a multicast group 3
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.
Brocade(config)# ip igmp max-response-time 8
Syntax: [no] ip igmp max-response-time num
The num variable specifies the number of seconds and can be a value from 1 – 25. The default is
10.
Security Enhancement for IGMP
A security enhancement has been made to IGMPv2 to adhere to the following recommendation of
RFC 2236: “Ignore the Report if you cannot identify the source address of the packet as belonging
to a subnet assigned to the interface on which the packet was received.”
NOTE
When used in applications such as IP-TV (or any multicast application in general), the administrator
should ensure that the set-top box (or multicast client) is configured on the same subnet as the v.e.
configured on the device. This is typically the case but is emphasized here to ensure correct
operation. Without this configuration, IGMP messages received by the device are ignored which
causes an interruption in any multicast traffic directed towards the set-top box (multicast client).
Adding an interface to a multicast group
You can manually add an interface to a multicast group. This is useful in the following cases:
• Hosts attached to the interface are unable to add themselves as members of the group using
IGMP.
• There are no members for the group attached to the interface.
When you manually add an interface to a multicast group, the device forwards multicast packets
for the group but does not itself accept packets for the group.
You can manually add a multicast group to individual ports only. If the port is a member of a virtual
routing interface, you must add the ports to the group individually.
To manually add a port to a multicast group, enter a command such as the following at the
configuration level for the port.
Brocade(config-if-e10000-1/1)# ip igmp static-group 224.2.2.2
This command adds port 1/1 to multicast group 224.2.2.2.
To add a port that is a member of a virtual routing interface to a multicast group, enter a command
such as the following at the configuration level for the virtual routing interface.
Brocade(config-vif-1)# ip igmp static-group 224.2.2.2 ethernet 5/2
This command adds port 5/2 in virtual routing interface 1 to multicast group 224.2.2.2.
Syntax: [no] ip igmp static-group ip-addr [ethernet slot/portnum]
The ip-addr parameter specifies the group number.
FastIron Ethernet Switch IP Multicast Configuration Guide 65
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