Multicast and Routing Guide K/KA/KB.15.15

Table 1 Comparison of IGMP operation with and without IP addressing
Operating differences without an IP addressAvailable without IP
addressing?
IGMP function available with IP addressing
configured on the VLAN
NoneYesForward multicast group traffic to any port on
the VLAN that has received a join request for
that multicast group.
NoneYesForward join requests (reports) to the Querier.
NoneYesConfigure individual ports in the VLAN to Auto
(the default)/Blocked, or Forward.
NoneYesConfigure IGMP traffic forwarding to normal
or high-priority forwarding.
Requires that another IGMP device in the VLAN
has an IP address and can operate as Querier.
YesAge-out IGMP group addresses when the last
IGMP client on a port in the VLAN leaves the
group. This can be a multicast router or another switch
configured for IGMP operation. (HP
YesSupport Fast-Leave IGMP and Forced
Fast-Leave IGMP (below.)
recommends that the VLAN also include a
device operating as a backup Querier in case
the device operating as the primary Querier
fails for any reason.)
Querier operation not available.NoSupport automatic Querier election.
Querier operation not available.NoOperate as the Querier.
Querier operation not available.NoAvailable as a backup Querier.
Automatic fast-leave IGMP
Depending on the switch model, fast-leave is enabled or disabled in the default configuration.
Default IGMP behaviorIGMP fast-leave
setting
Data-driven IGMP
included?
Switch model or series
Drops unjoined mulitcast traffic except for
always-fowarded traffic toward the Querier or
Always EnabledYesSwitch 8200zl
Switch 6600
multicast routers and out of IGMP-forward
Switch 6400cl
ports. Selectively forwards joined multicast
Switch 6200yl
traffic, except on IGMP-forward ports, which
forward all multicast traffic.
Switch 5400zl
Switch 5300xl
Switch 4200vl
Switch 3500
Switch 3500yl
Switch 3400cl
Switch 2910
Switch 2900
Switch 2610
Switch 2510
Switch 2500
IGMP fast-leave disabled in the default
configuration. Floods unjoined multicast traffic
Disabled in the default
configuration
NoSwitch 2600
Switch 2600-PWR
to all ports. Selectively forwards joined
Switch 4100gl
multicast traffic, except on IGMP-forward ports,
which forward all multicast traffic.
Switch 6108
How IGMP operates 27