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Using PIM Sparse Mode Join Filters
ip pim join-filter
Configuring PIM SSM
Copyright © 2010, Juniper Networks, Inc.
You can use PIM sparse mode join filters to prevent multicast state from being created
in the PIM sparse mode router. The filters are applied to join entries in PIM join/prune
messages that are received from PIM sparse mode neighbors.
By denying joins at the edge of a network, you can limit the multicast state and traffic in
the network. By accepting only certain joins, you can control which multicast services an
end user can receive. PIM join filters also reduce the potential for denial of service (DoS)
attacks where large numbers of joins forwarded to each router on the RPT can result in
a PIM state explosion and very high memory consumption.
For information about how to create access lists, see Configuring Routing Policy in the
JunosE IP Services Configuration Guide.
Use to specify an extended access list that you want this PIM interface to use as a join
filter.
You can apply the join filter at the global level or at the interface level.
If an interface-level filter exists, it takes precedence over the global-level filter.
Example 1
host1(config)#ip pim join-filter gold
Example 2
host1(config-interface)#ip pim join-filter gold
Use the no version to remove the filter association.
See ip pim join-filter.
Source Specific Multicast (SSM) is a datagram delivery model that best supports
one-to-many applications, also known as broadcast applications. SSM is networking
technology that targets audio and video broadcast application environments.
To configure PIM SSM, you enable PIM SSM on the router and define the SSM range of
IP multicast addresses.
To use PIM SSM, IGMPv3 must be configured on customer premise equipment
(CPE)–facing interfaces to receivers, and PIM sparse mode must be configured on
CPE-facing interfaces to sources and on core-facing interfaces. After configuring SSM,
you can use the show ip pim sparse-mode sg-state command to display SSM group
membership information.
To configure PIM SSM:
Chapter 3: Configuring PIM for IPv4 Multicast
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