Subscriber Services
7750 SR OS Services Guide Page 155
host over the binding. Due to the dynamic nature of the way that a spoke or mesh SDP binding is
associated with one or more egress network IP interfaces, the system treats the binding as appearing
on all network ports. This causes all possible network destinations in the switch fabric to be included
in the multicast streams flooding domain. The MDA destination list provides a simple mechanism
that narrows the IP multicast switch fabric destinations for the spoke or mesh SDP binding.
If no MDAs are defined within the allowed-mda-destinations node, the system operates normally and
will forward IP multicast flooded packets associated with the spoke or mesh SDP binding to all
switch fabric taps containing network IP interfaces.
The MDA inclusion list should include all MDAs that the SDP binding may attempt to forward
through. A simple way to ensure that an MDA that is not included in the list is not being used by the
binding is to define the SDP the binding is associated with as MPLS and use an RSVP-TE LSP with a
strict egress hop. The MDA associated with the IP interface defined as the strict egress hop should be
present in the inclusion list.
If the inclusion list does not currently contain the MDA that the binding is forwarding through, the
multicast packets will not reach the destination represented by the binding. By default, the MDA
inclusion list is empty.
If an MDA is removed from the list, the MDA is automatically removed from the flooding domain of
any snooped IP multicast streams associated with a destination on the MDA unless the MDA was the
last MDA on the inclusion list. Once the inclusion list is empty, all MDAs are eligible for snooped IP
multicast flooding for streams associated with the SDP binding.
mda
Syntax [no] mda mda-id
Context config>service>pw-template>egress>mfib-mda
Description This command specifies an MFIB-allowed MDA destination for an SDP binding configured in the
system.
Parameters mda-id — Specifies an MFIB-allowed MDA destination.
Values 1, 2
igmp-snooping
Syntax igmp-snooping
Context config>service>pw-template
Description This command enables the Internet Group Management Protocol (IGMP) snooping context.
Default none
fast-leave
Syntax [no] fast-leave
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