682 CHAPTER 48: MSDP CONFIGURATION
Configuring MSDP Peer
Connection Control
MSDP peers are interconnected over TCP (port number 639). You can flexibly
control sessions between MSDP peers by manually deactivating and reactivating
the MSDP peering connections. When the connection between two MSDP peers is
deactivated, SA messages will no longer be delivered between them, and the TCP
connection is closed without any connection setup retry, but the configuration
information will remain unchanged.
When a new MSDP peer is created, or when a previously deactivated MSDP peer
connection is reactivated, or when a previously failed MSDP peer attempts to
resume operation, a TCP connection is required. You can flexibly adjust the interval
between MSDP peering connection retries.
Follow these steps to configure MSDP peer connection control:
Configuring SA
Messages Related
Parameters
Configuration
Prerequisites
Before configuring 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.
■ Configuring basic functions of MSDP
Before configuring SA message delivery, prepare the following data:
■ ACL as a filtering rule for SA request messages
■ ACL as an SA message creation rule
■ ACL as a filtering rule for receiving or forwarding SA messages
■ Minimum TTL value of multicast packets encapsulated in SA messages
■ Maximum SA message cache size
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 has to 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. Since
the (S, G) entries have timed out, remote receivers can never receive the multicast
data from the multicast source.
To do… Use the command… Remarks
Enter system view system-view -
Enter MSDP view msdp -
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
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