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Adding an interface to a multicast group 3<br />
To change the IGMP (V1 and V2) maximum response time, enter a command such as the following<br />
at the global CONFIG level of the CLI.<br />
<strong>Brocade</strong>(config)# ip igmp max-response-time 8<br />
Syntax: [no] ip igmp max-response-time num<br />
The num variable specifies the number of seconds and can be a value from 1 – 25. The default is<br />
10.<br />
Security Enhancement for IGMP<br />
A security enhancement has been made to IGMPv2 to adhere to the following recommendation of<br />
RFC 2236: “Ignore the Report if you cannot identify the source address of the packet as belonging<br />
to a subnet assigned to the interface on which the packet was received.”<br />
NOTE<br />
When used in applications such as IP-TV (or any multicast application in general), the administrator<br />
should ensure that the set-top box (or multicast client) is configured on the same subnet as the v.e.<br />
configured on the device. This is typically the case but is emphasized here to ensure correct<br />
operation. Without this configuration, IGMP messages received by the device are ignored which<br />
causes an interruption in any multicast traffic directed towards the set-top box (multicast client).<br />
Adding an interface to a multicast group<br />
You can <strong>manual</strong>ly add an interface to a multicast group. This is useful in the following cases:<br />
• Hosts attached to the interface are unable to add themselves as members of the group using<br />
IGMP.<br />
• There are no members for the group attached to the interface.<br />
When you <strong>manual</strong>ly add an interface to a multicast group, the device forwards multicast packets<br />
for the group but does not itself accept packets for the group.<br />
You can <strong>manual</strong>ly add a multicast group to individual ports only. If the port is a member of a virtual<br />
routing interface, you must add the ports to the group individually.<br />
To <strong>manual</strong>ly add a port to a multicast group, enter a command such as the following at the<br />
configuration level for the port.<br />
<strong>Brocade</strong>(config-if-e10000-1/1)# ip igmp static-group 224.2.2.2<br />
This command adds port 1/1 to multicast group 224.2.2.2.<br />
To add a port that is a member of a virtual routing interface to a multicast group, enter a command<br />
such as the following at the configuration level for the virtual routing interface.<br />
<strong>Brocade</strong>(config-vif-1)# ip igmp static-group 224.2.2.2 ethernet 5/2<br />
This command adds port 5/2 in virtual routing interface 1 to multicast group 224.2.2.2.<br />
Syntax: [no] ip igmp static-group ip-addr [ethernet slot/portnum]<br />
The ip-addr parameter specifies the group number.<br />
FastIron Ethernet Switch IP Multicast Configuration Guide 65<br />
53-1002638-02