Chapter 14
IPv6 PIM-SSM Configuration
Table of Contents
14.1 PIM-SSM Overview
Protocol Independent Multicast-Source Specific Multicast (
) has all advantages
of PIM-SM. PIM-SSM does not construct a shared tree. Instead, it only constructs the
SPT. When receiving the member relation report messages about a specific source and a
group, PIM-SSM will construct the SPT directly.
PIM-SSM is a subset of PIM-SM. PIM-SSM is suitable for the well known sources. It is
both intra-domain and inter-domain valid. PIM-SM uses MSDP for inter-domain multicast
routing. PIM-SSM does not need to use MSDP. The multicast group address allocated
for PIM-SSM is FF3X::/32. The switches will not construct a shared tree for this group
address.
After a host sends a Join message from a specific source to a group, the last hop switch
will send a (S, G) Join message to the direction of the source to construct a SPT. The last
hop switch will not send a (*, G) Join message to the direction of RP. Once the SPT is
constructed, the first hop switch will forward packets along this tree.
14.2 Configuring IPv6 PIM-SSM
To configure IPv6 PIM-SSM on ZXR10 5900E, perform the following step.
Command
Function
ZXR10(config-mcast-ipv6-pim)#
ssm range default
[
group-list
<
access-list-name
>]
Configures address range of IPv6
SSM groups or uses the default
group address range.
The command parameter is described as follows:
Parameter
Description
<
access-list-name
>
ACL name, with 1-31 characters
When the
group-list
is not configured, the default group range is FF3X::/32.
14-1
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