Supermicro SSE-F3548S - 7.8 Port Timeout (Port Purge Interval)

Supermicro SSE-F3548S/SSE-F3548SR Configuration User’s Guide
204
Step
Command
Description
Step 1
configure terminal
Enters the configuration mode.
Step 2
ip igmp snooping report-forward { all-ports |
router-ports }
Configures the IGMP host member’s
report forwarding behavior.
Use all-ports to configure a switch to
forward IGMP host member reports to
all ports.
Use router-ports to configure the
switch to forward the IGMP host
member reports to the router ports
only.
The default behavior is router-ports.
Step 3
end
Exits the configuration mode.
Step 4
show ip igmp snooping globals
Displays the IGMP snooping
information.
Step 5
write startup-config
Optional step – saves this IGMP
snooping configuration to be part of
the startup configuration.
The “no ip igmp snooping report-forward” command configures the switch to the default
behavior of forwarding the IGMP host member reports only to the router port.
The example below shows the commands used to configure IGMP member report forwarding.
Configure the switch to forward the IGMP member report to all ports.
SMIS# configure terminal
SMIS(config)# ip igmp snooping report-forward all-ports
SMIS(config)# end
7.8 Port Timeout (Port Purge Interval)
A switch recognizes an IGMP host’s connected ports by snooping the IGMP join messages sent by the host
and maintains a multicast forwarding table based on the host’s joined ports for every multicast group.
After recognizing the host’s member ports, a switch expects to receive IGMP member reports periodically
on the host ports. If an IGMP member’s reports are not received over a time period in any host member
port, the switch will remove those ports from the corresponding group entry in the multicast forwarding
table. This time period is called the port purge interval value. Once a host port is removed from the
multicast forwarding table for any group, it will no longer receive the multicast traffic for that group.