Interface - Dell PowerConnect B-RX Configuration Manual

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IGMP v3
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:
•
•
For example, two clients (Client A and Client B) belong to group1 but each is receiving traffic
streams from different sources. Client A receives a stream from (source_1, group1) and Client B
receives it from (source_2, group1). Now, if Client B leaves, the traffic stream ( source_2, group1)
will be stopped immediately. The show ip igmp group tracking command displays that clients in a
group that are being tracked.
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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.)
No other client on the interface is receiving traffic from the group to which the client belongs.
Every group on the physical interface of a virtual routing interface keeps its own tracking
record. It can track by (source, group).
BigIron RX Series Configuration Guide
53-1001810-01