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Enhancements in Release F.02.02
Operation and Enhancements for Multimedia Traffic Control (IGMP)
Forced Fast-Leave IGMP
Forced Fast-Leave IGMP Features
Forced Fast-Leave IGMP speeds up the process of blocking unnecessary IGMP traffic to a switch
port that is connected to multiple end nodes. (This feature does not activate on ports where the switch
detects only one end node. Instead, the regular Fast Leave described in the preceding section
activates.) For example, in figure 105, even if you configured Forced Fast-Leave on all ports in the
switch, the feature would activate only on port 7 (which has multiple end nodes) when a Leave Group
request arrived on that port.
When a port having multiple end nodes receives a Leave Group request from one end node for a given
multicast group "X", Forced Fast-Leave activates and waits a small amount of time to receive a join
request from any other group "X" member on that port. If the port does not receive a join request for
that group within the forced-leave interval, the switch then blocks any further group "X" traffic to the
port.
Configuration Options for Forced Fast-Leave
CLI: Listing the Forced Fast-Leave Configuration
The Forced Fast-Leave configuration includes the state (enabled or disabled) for each port and the
Forced-Leave Interval for all ports on the switch.
To list the Forced Fast-Leave state for all ports in the switch:
Syntax: HP2512# walkmib hpSwitchIgmpPortForcedLeaveState.1
or
HP2512# walkmib 1.3.6.1.4.1.11.2.14.11.5.1.7.1.15.3.1.5.1
Feature Default Menu CLI Web
view the Forced Fast-Leave configuration
view the switch’s Forced Fast-Leave state n/a — page 212 —
configure Forced Fast-Leave
configure Forced Fast-Leave for an individual port 2 (disabled) — page 214 —
Feature Default Settings Function
Forced Fast-
Leave state
2 (disabled) 1 (enabled)
2 (disabled)
Uses the setmib command to enable or disable Forced Fast-Leave on
individual ports. When enabled on a port, Forced Fast-Leave operates only if
the switch detects multiple end nodes (and at least one IGMP client) on that
port.