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IGMP snooping configuration 2<br />
Turning off static group proxy<br />
If a device has been configured for static groups, it acts as a proxy and sends membership reports<br />
for the static groups when it receives general or group-specific queries. When a static group<br />
configuration is removed, it is deleted from the active group table immediately. However, leave<br />
messages are not sent to the querier, and the querier must age out the group. Proxy activity can be<br />
turned off. The default is on. To turn proxy activity off for VLAN 20, enter the following commands.<br />
<strong>Brocade</strong>(config)#vlan 20<br />
<strong>Brocade</strong>(config-vlan-20)#multicast proxy-off<br />
Syntax: [no] multicast proxy-off<br />
Enabling IGMP V3 membership tracking and<br />
fast leave for the VLAN<br />
IGMP V3 gives clients membership tracking and fast leave capability. In IGMP V2, only one client on<br />
an interface needs to respond to a router's queries. This can leave some clients invisible to the<br />
router, making it impossible to track the membership of all clients in a group. When a client leaves<br />
the group, the device sends group-specific queries to the interface to see if other clients on that<br />
interface need the data stream of the client who is leaving. If no client responds, the device waits a<br />
few seconds before it stops the traffic. You can configure the wait time using the ip multicast<br />
leave-wait-time command.<br />
IGMP V3 requires every client to respond to queries, allowing the device to track all clients. When<br />
tracking is enabled, and an IGMP V3 client sends a leave message and there is no other client, the<br />
device immediately stops forwarding traffic to the interface. This feature requires the entire VLAN<br />
be configured for IGMP V3 with no IGMP V2 clients. If a client does not send a report during the<br />
specified group membership time (the default is 260 seconds), that client is removed from the<br />
tracking list.<br />
Every group on a physical port keeps its own tracking record. However, it can only track group<br />
membership; it cannot track by (source, group). For example, Client A and Client B belong to group1<br />
but each receives traffic streams from different sources. Client A receives a stream from (source_1,<br />
group1) and Client B receives a stream from (source_2, group1). The device still waits for the<br />
configured leave-wait-time before it stops the traffic because these two clients are in the same<br />
group. If the clients are in different groups, then the waiting period is not applied and traffic is<br />
stopped immediately.<br />
To enable the tracking and fast leave feature for VLAN 20, enter the following commands.<br />
<strong>Brocade</strong>(config)#vlan 20<br />
<strong>Brocade</strong>(config-vlan-20)#multicast tracking<br />
Syntax: [no] multicast tracking<br />
The membership tracking and fast leave features are supported for IGMP V3 only. If any port or any<br />
client is not configured for IGMP V3, then the multicast tracking command is ignored.<br />
FastIron Ethernet Switch IP Multicast Configuration Guide 39<br />
53-1002638-02
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