ECS4660-28F_Management Guide-R03

C HAPTER 21 | Multicast Routing
Configuring PIM for IPv4
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WEB INTERFACE
To display neighboring PIM routers:
1. Click Routing Protocol, PIM, Neighbor.
Figure 527: Showing PIM Neighbors
CONFIGURING GLOBAL
PIM-SM SETTINGS
Use the Routing Protocol > PIM > SM (Configure Global) page to configure
the rate at which register messages are sent, the source of register
messages, and switchover to the Shortest Path Tree (SPT).
CLI REFERENCES
◆ "IPv4 PIM Commands" on page 1927
PARAMETERS
These parameters are displayed:
◆ Register Rate Limit – Configures the rate at which register messages
are sent by the Designated Router (DR) for each (source, group) entry.
(Range: 1-65535 packets per second: Default: disabled)
This parameter can be used to relieve the load on the designated router
(DR) and rendezvous point (RP). However, because register messages
exceeding the limit are dropped, some receivers may experience data
packet loss within the first few seconds in which register messages are
sent from bursty sources.
◆ 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 PIM-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, to use the SPT)
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