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Multimedia Traffic Control with IP Multicast (IGMP)
More on IGMP Operation
Forced Fast-Leave IGMP
Forced Fast-Leave IGMP Features
Feature Default Menu CLI Web
view the Forced Fast-Leave configuration
view the switch’s Forced Fast-Leave state n/a — page 12-19 —
configure Forced Fast-Leave
configure Forced Fast-Leave for an individual port 2 (disabled) — page 12-20 —
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 12-6, 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
Feature Default Settings Function
Forced Fast- 2 (disabled) 1 (enabled) Uses the setmib command to enable or disable Forced Fast-Leave on
Leave state
2 (disabled)
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.
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: HPswitch# walkmib hpSwitchIgmpPortForcedLeaveState.1
or
HPswitch# walkmib 1.3.6.1.4.1.11.2.14.11.5.1.7.1.15.3.1.5.1
12-18