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• When you reactivate a previously deactivated MSDP peer connection
• When a previously failed MSDP peer attempts to resume operation
You can adjust the interval between MSDP peer connection retries.
Follow these steps to configure MSDP peer connection control:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network MSDP view
or VPN instance MSDP view
msdp [ vpn-instance vpn-instance-
name ]
—
Deactivate an MSDP peer shutdown peer-address
Optional
Active by default
Configure the interval between
MSDP peer connection retries
timer retry interval
Optional
30 seconds by default
Configuring SA messages related parameters
Configuration prerequisites
Before you configure SA message delivery, complete the following tasks:
• Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer
• Configure basic functions of MSDP
• Determine the ACL rules for filtering SA request messages
• Determine the ACL rules as SA message creation rules
• Determine the ACL rules for filtering SA messages to be received and forwarded
• Determine the TTL threshold for multicast packet encapsulation in SA messages
• Determine the maximum number of (S, G) entries learned from the specified MSDP peer that the
router can cache
Configuring SA message content
Some multicast sources send multicast data at an interval longer than the aging time of (S, G) entries. In
this case, the source-side DR must encapsulate multicast data packet by packet in register messages and
send them to the source-side RP. The source-side RP transmits the (S, G) information to the remote RP
through SA messages. Then the remote RP joins the source-side DR and builds an SPT. Because the (S,
G) entries have timed out, remote receivers can never receive the multicast data from the multicast
source.
If the source-side RP is enabled to encapsulate register messages in SA messages, when there is a
multicast packet to deliver, the source-side RP encapsulates a register message that contains the multicast
packet in an SA message and sends it out. After the remote RP receives the SA message, it de-
encapsulates the SA message and delivers the multicast data contained in the register message to the
receivers along the RPT.
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