Dell BigIron RX Series, Configuration Manual

Page: 665 / 1458

BigIron RX Series Configuration Guide 589
53-1002253-01
IGMP v3
23
Enabling the IGMP version per interface setting
To specify the IGMP version for a physical port, enter a command such as the following.
BigIron RX(config)# interface eth 1/5
BigIron RX(config-if-1/5)# ip igmp version 3
To specify the IGMP version for a virtual routing interface on a physical port, enter a command such
as the following.
BigIron RX(config)# interface ve 3
BigIron RX(config-vif-1) ip igmp version 3
Syntax: [no] ip igmp version <version-number>
Enter 1, 2, or 3 for <version-number> . Version 2 is the default version.
Enabling the IGMP version on a physical port within a
virtual routing interface
To specify the IGMP version recognized by a physical port that is a member of a virtual routing
interface, enter a command such as the following.
BigIron RX(config)# interface ve 3
BigIron RX(config-vif-3)# ip igmp version 2
BigIron RX(config-vif-3)# ip igmp port-version 3 e1/3 to e1/7 e2/9
In this example, the second line sets IGMP V2 on virtual routing interface 3. However, the third line
set IGMP V3 on ports 1/3 through 1/7 and port e2/9. All other ports in this virtual routing interface
are configured with IGMP V2.
Syntax: ip igmp port-version <version-number> ethernet <port-number>
Enter 1, 2, or 3 for <version-number> . IGMP V2 is the default version.
The ethernet <port-number> parameter specifies which physical port within a virtual routing
interface is being configured.
Enabling membership tracking and fast leave
IGMP V3 provides membership tracking and fast leave of clients. In IGMP V2, only one client on an
interface needs to respond to a router’s queries; therefore, some of the clients may be invisible to
the router, making it impossible for the switch to track the membership of all clients in a group.
Also, when a client leaves the group, the switch sends group specific queries to the interface to see
if other clients on that interface need the data stream of the client who is leaving. If no client
responds, the switch waits three seconds before it stops the traffic.
IGMP V3 contains the tracking and fast leave feature that you enable on virtual routing interfaces.
Once enabled, all physical ports on that virtual routing interface will have the feature enabled.
IGMP V3 requires all clients to respond to general and group specific queries so that all clients on
an interface can be
tracked. Fast leave allows clients to leave the group without the three second
waiting period, if the following conditions are met:
•
If the interface, to which the client belongs, has IGMP V3 clients only. Therefore, all physical
ports on a virtual routing interface must have IGMP V3 enabled and no IGMP V1 or V2 clients
can be on the interface. (Although IGMP V3 can handle V1 and V2 clients, these two clients
cannot be on the interface in order for fast leave to take effect.)