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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 by selecting "Reset" to force the router to use
the shared tree for all multicast groups, or just for the specified
multicast groups. (This is the default setting.)
Group Address – An IP multicast group address. If a group address is
◆
not specified, the shared tree is used for all multicast groups.
Group Mask – Subnet mask that is used for the group address.
◆
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NTERFACE
To configure global settings for PIM-SM:
Click Multicast, Multicast Routing, SM.
1.
Select Configure Global from the Step list.
2.
Set the register rate limit and source of register messages if required.
3.
Also specify any multicast groups which must be routed across the
shared tree, instead of switching over to the SPT.
Click Apply.
4.
Figure 528: Configuring Global Settings for PIM-SM
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| Multicast Routing
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21
HAPTER
Configuring PIM for IPv4
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