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 use PIM SSM, MLDv2 must be configured on customer premises 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 ipv6 pim sparse-mode sg-state command to display SSM group
membership information.
To configure PIM SSM, you enable PIM SSM on the router and define the SSM range of
IP multicast addresses.
Figure 22 on page 219 shows how PIM SSM is configured between a receiver and a source
in the network. Interface 1 has MLDv2 enabled and all other interfaces towards the core
or source have PIM SSM enabled.
Figure 22: Network on Which to Configure PIM SSM
g017108
Source
Receiver
RP router 4
3
2 1
To configure PIM SSM:
1. Enable PIM SSM on the E Series router. The IANA SSM range is configured by default.
You can modify the SSM address range by using the access list.
host1(config)#access-list 15 permit ip any host 239.0.0.2
host1(config)#access-list 15 permit ip any 232.0.0.0 0.225.225.225
host1(config)#ipv6 pim ssm range 15
2. Enable PIM sparse mode on the CPE-facing interface towards the source or core.
3. Enable MLDv2 on the CPE-facing interface towards the receiver.
PIM SSM also works with MLDv1 if you configure the ssm-map in MLD as in the following
example:
host1(config)#ipv6 pim ssm
host1(config)#ipv6 access-list ssm_map1 permit any host ff3e::1
host1(config)#ipv6 mld ssm-map enable
host1(config)#ipv6 mld ssm-map static ssm_map1 51::1
The no version disables ssm-map:
host1(config)#no ipv6 mld ssm-map static ssm_map1 51::1
219Copyright © 2010, Juniper Networks, Inc.
Chapter 7: Configuring PIM for IPv6 Multicast
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