Juniper EX9200 Features Manual page 57

Related
Documentation
Copyright © 2016, Juniper Networks, Inc.
By the use of PIM proxying
PIM snooping configures a device to examine and operate only on PIM hello and join/prune
packets. A PIM snooping device snoops PIM hello and join/prune packets on each interface
to find interested multicast receivers and populates the multicast forwarding tree with
this information. PIM snooping differs from PIM proxying in that both PIM hello and
join/prune packets are transparently flooded in the VPLS as opposed to the flooding of
only hello packets in the case of PIM proxying. PIM snooping is configured on PE routers
connected through pseudowires. PIM snooping ensures that no new PIM packets are
generated in the VPLS, with the exception of PIM messages sent through LDP on
pseudowires.
NOTE: In the VPLS documentation, the word router in terms such as PE router
is used to refer to any device that provides routing functions.
A device that supports PIM snooping snoops hello packets received on attachment
circuits. It does not introduce latency in the VPLS core when it forwards PIM join/prune
packets.
To configure PIM snooping on a PE router, use the
routing-instances instance-name protocols]
routing-instances {
customer {
instance-type vpls;
...
protocols {
pim-snooping{
traceoptions {
file pim.log size 10m;
flag all;
flag timer disable;
}
}
}
}
}
Example: Configuring PIM Snooping for VPLS explains the PIM snooping method. The use
of the PIM proxying method is not discussed here and is outside the scope of this
document. For more information about PIM proxying, see
Example: Configuring PIM Snooping for VPLS
Chapter 4: Assigning Routing Instances to VPLS
statement at the
pim-snooping
hierarchy level:
PIM Snooping over VPLS
[edit
.
39