User`s guide

Chapter 6 Virtual Network Interface Cards (vNICs) 107
A common use case for delayed leaves is an ESX environment where a single vNIC
may be acting as the uplink for many guests. Typically, in this scenario, multiple
guests are hosting the same application which joins a given group. With the delayed
leave feature, a guest terminating its membership in a group does not interrupt
traffic for other guests receiving multicast traffic on the same group.
You can control delayed leaves on a per-I/O module basis through the set
ethernet-card command. This command enables you to set the card to use either
fast leaves or delayed leaves.
Delayed leave is the default behavior.
Related Commands
Additional commands are available for displaying various aspects of the IGMP
functionality.
Note – If the delayed leave features is not enabled and fast leaves are enabled
instead, the enables field shows a v instead of a dash.
set ethernet-card <slot> -igmp-fastleave=<true|false|default>
Parameter Description
show ethernet-card <name> Displays the current setting for delayed IGMP fast joins and leaves
through a flag in the command’s output. For example:
In the enables field, the dash (-) (shown in red text) indicates that
IGMP delayed leave is enabled (the default) on the I/O Module.
show vnic <vnic-name> igmp-stats Displays vNIC membership information and statistics for an IGMP
Multicast group. No specific statistics are tracked for delayed
leaves versus fast leaves. All leaves are tracked through the IGMP
Leaves counter in this command’s output.
show ethernet-card 14
-----------------------------------------------------------------
slot 14
state up/up
descr
type nwEthernet10Port1GbCard
vnics 20
qos default
acl FabricManagerGeneratedAclSet