Page 156 7750 SR OS Services Guide
Context config>service>pw-template>igmp-snooping
Description This command enables fast leave.
When IGMP fast leave processing is enabled, the SR-Series will immediately remove a SAP or SDP
from the IP multicast group when it detects an IGMP 'leave' on that SAP or SDP. Fast leave
processing allows the switch to remove a SAP or SDP that sends a 'leave' from the forwarding table
without first sending out group-specific queries to the SAP or SDP, and thus speeds up the process of
changing channels ('zapping').
Fast leave should only be enabled when there is a single receiver present on the SAP or SDP.
When fast leave is enabled, the configured last-member-query-interval value is ignored.
Default no fast-leave
import
Syntax import policy-name
no import
Context config>service>pw-template>igmp-snooping
Description This command specifies the import routing policy to be used for IGMP packets. Only a single policy
can be imported at a time.
The no form of the command removes the policy association.
Default no import — No import policy is specified.
Parameters policy-name — The import policy name. Allowed values are any string up to 32 characters long
composed of printable, 7-bit ASCII characters. If the string contains special characters (#, $,
spaces, etc.), the entire string must be enclosed within double quotes. Routing policies are
configured in the config>router>policy-options context The router policy must be defined before
it can be imported.
last-member-query-interval
Syntax last-member-query-interval tenths-of-seconds
no last-member-query-interval
Context config>service>pw-template>igmp-snooping
Description This command configures the maximum response time used in group-specific queries sent in
response to ‘leave’messages, and is also the amount of time between 2 consecutive group-specific
queries. This value may be tuned to modify the leave latency of the network. A reduced value results
in reduced time to detect the loss of the last member of a group.
The configured last-member-query-interval is ignored when fast-leave is enabled on the SAP or SDP.
Default 10
Parameters tenths of seconds — Specifies the frequency, in tenths of seconds, at which query messages are sent.
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