UMN:CLI User Manual
V5808
426
TCN Flooding Query Solicitation
Typically, if a network topology change occurs, the spanning tree root switch issues a
query solicitation which is actually a global leave message with the group address 0.0.0.0.
When a multicast router receives this solicitation, it immediately sends out IGMP general
queries to hosts, allowing the fast convergence. You can direct the switch where an IGMP
snooping is running to send a query solicitation when TCN is received.
To enable the switch to send a query solicitation when TCN is received, use the following
command.
ip igmp snooping tcn query
solicit [address A.B.C.D]
Enables the switch to send a query solicitation when
TCN is received.
address: source IP address for query solicitation
To disable the switch to send a query solicitation when TCN is received, use the following
command.
no ip igmp snooping tcn query
solicit [address]
Disables the switch to send a query solicitation when
TCN is received.
IGMP Snooping TCN Debug
To enable debugging of all IGMP snooping TCN, use the following command.
Enables IGMP snooping Topology Change Notification
(TCN) debugging.
no debug igmp snooping tcn
Disables IGMP snooping Topology Change Notification
(TCN) debugging.
9.2.4 IGMPv3 Snooping
Immediate Block
IGMPv3 immediate block feature allows a host to block sources with the block latency, 0
(zero) by referring to the explicit tracking database. When receiving a membership report
with the state-change record from a host that is no longer interested in receiving multicast
traffic from a certain source, the switch compares the source list for the host in the explicit
tracking database with the source list in the received membership report. If both are
matching, the switch removes the source entry from the list in the database, and stops
forwarding the multicast traffic to the host; no group-source-specific query message is
needed for the membership leave process.
To enable IGMPv3 immediate block, use the following command.
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