3Com MSR 50 Series Configuration Manual page 1183

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When configuring a C-RP, ensure a relatively large bandwidth between this
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C-RP and the other devices in the PIM-SM domain.
An RP can serve multiple multicast groups or all multicast groups. Only one RP
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can forward multicast traffic for a multicast group at a moment.
Enabling auto-RP
Auto-RP announcement and discovery messages are respectively addressed to the
multicast group addresses 224.0.1.39 and 224.0.1.40. With auto-RP enabled on a
device, the device can receive these two types of messages and record the RP
information carried in such messages.
Follow these steps to enable auto-RP:
To do...
Enter system view
Enter public instance PIM view
or VPN instance PIM view
Enable auto-RP
Configuring C-RP timers
To enable the BSR to distribute the RP-set information within the PIM-SM domain,
C-RPs must periodically send C-RP-Adv messages to the BSR. The BSR learns the
RP-set information from the received messages, and encapsulates its own IP
address together with the RP-set information in its bootstrap messages. The BSR
then floods the bootstrap messages to all PIM routers (224.0.0.13) in the network.
Each C-RP encapsulates a timeout value in its C-RP-Adv message. Upon receiving
this message, the BSR obtains this timeout value and starts a C-RP timeout timer. If
the BSR fails to hear a subsequent C-RP-Adv message from the C-RP when the
timer times out, the BSR assumes the C-RP to have expired or become
unreachable.
Follow these steps to configure C-RP timers:
To do...
Enter system view
Enter public instance PIM view
or VPN instance PIM view
Configure the C-RP-Adv
interval
Configure C-RP timeout time
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The commands introduced in this section are to be configured on C-RPs.
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For the configuration of other timers in PIM-SM, refer to
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Common Timers" on page
Use the command...
system-view
pim [ vpn-instance
vpn-instance-name ]
auto-rp enable
Use the command...
system-view
pim [ vpn-instance
vpn-instance-name ]
c-rp advertisement-interval
interval
c-rp holdtime interval
1190.
Configuring PIM-SM 1183
Remarks
-
-
Optional
Disabled by default
Remarks
-
-
Optional
60 seconds by default
Optional
150 seconds by default
"Configuring PIM