Edge-Core ECS4620-28T Quick Start Manual page 788

Chapter 20
| Multicast Routing
Configuring PIMv6 for IPv6
◆
Register Source – Configures the IP source address of a register message to an
address other than the outgoing interface address of the DR that leads back
toward the RP. (Range: VLAN 1-4094; Default: The IP address of the DR's
outgoing interface that leads back to the RP)
When the source address of a register message is filtered by intermediate
network devices, or is not a uniquely routed address to which the RP can send
packets, the replies sent from the RP to the source address will fail to reach the
DR, resulting in PIM6-SM protocol failures. This type of problem can be
overcome by manually configuring the source address of register messages to
an interface that leads back to the RP.
◆
SPT Threshold – Prevents the last-hop PIM-SM router from switching to
Shortest Path Source Tree (SPT) mode. (Options: Infinity, Reset; Default: Reset)
The default path for packets from a multicast source to a receiver is through the
RP. However, the path through the RP is not always the shortest path. Therefore,
the router uses the RP to forward only the first packet from a new multicast
group to its receivers. Afterwards, it calculates the shortest path tree (SPT)
directly between the receiver and source, and then uses the SPT to send all
subsequent packets from the source to the receiver instead of using the shared
tree. Note that when the SPT threshold is not set by this command, the PIM leaf
router will join the shortest path tree immediately after receiving the first
packet from a new source.
Enable the SPT threshold to force the router to use the shared tree for all
multicast groups, or just for the specified multicast groups.
◆
Group Address – An IPv6 multicast group address. If a group address is not
specified, the shared tree is used for all multicast groups.
◆
Group Prefix Length – An IPv6 network prefix length for a multicast group.
(Range: 8-128)
Web Interface
To configure global settings for PIM6-SM:
1.
Click Routing Protocol, PIM6, SM.
2.
Select Configure Global from the Step list.
3.
Set the register rate limit and source of register messages if required. Also
specify any multicast groups which must be routed across the shared tree,
instead of switching over to the SPT.
4.
Click Apply.
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