H3C Technologies H3C S3600 Series Switches - Manual (Page 441)

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z Before you configure an MSDP mesh group, make sure that the routers are fully connected with
one another.
z The same group name must be configured on all the peers before they can join a mesh group.
z If you add the same MSDP peer to multiple mesh groups, only the latest configuration takes effect.
Configuring MSDP Peer Connection Control
The connection between MSDP peers can be flexibly controlled. You can disable the MSDP peering
relationships temporarily by shutting down the MSDP peers. As a result, SA messages cannot be
transmitted between these two peers. On the other hand, when resetting an MSDP peering relationship
between faulty MSDP peers or bringing faulty MSDP peers back to work, you can adjust the retry
interval of establishing a peering relationship through the following configuration.
Follow these steps to configure MSDP peer connection control:
To do... Use the command... Remarks
Enter system view system-view —
Enter MSDP view msdp —
Shut down the connection with
the specified MSDP peer
shutdown peer-address
Optional
By default, all MSDP peering
connections are up.
Configure the retry interval of
MSDP peer connection
establishment
timer retry seconds
Optional
30 seconds by default
Configuring SA Message Transmission
An SA message contains the IP address of the multicast source S, multicast group address G, and RP
address. In addition, it contains the first multicast data received by the RP in the domain where the
multicast source resides. For some burst multicast data, if the multicast data interval exceeds the SA
message hold time, the multicast data must be encapsulated in the SA message; otherwise, the
receiver will never receive the multicast source information.
By default, when a new receiver joins, a router does not send any SA request message to its MSDP
peer but has to wait for the next SA message. This defers the reception of the multicast information by
the receiver. In order for the new receiver to know about the currently active multicast source as quickly
as possible, the router needs to send SA request messages to the MSDP peer.
Generally, a router accepts all SA messages sent by all MSDP peers and sends all SA messages to all
MSDP peers. By configuring the rules for filtering SA messages to receive/send, you can effectively
control the transmission of SA messages among MSDP peers. For forwarded SA messages, you can
also configure a Time-to-Live (TTL) threshold to control the range where SA messages carrying
encapsulated data are transmitted.