Using Pim Sparse Mode Join Filters; Configuring Pim Ssm - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

JUNOSe 11.0.x Multicast Routing Configuration Guide

Using PIM Sparse Mode Join Filters

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.
ip pim join-filter

Configuring PIM SSM

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.
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Using PIM Sparse Mode Join Filters

Use to configure a group address pool for a data MDT tunnel.
Example
host1(ip-pim-data-mdt-config)#tunnel group-address-pool dataMDT1
Use the no version to delete the group address pool.
See tunnel group-address-pool.
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.