Configuring Sa Message Transmission; Configuring Msdp Peer Connection Control - Huawei Quidway S3900 Series Operation Manual

Operation Manual – Multicast Protocol
Quidway S3900 Series Ethernet Switches-Release 1510

8.3.5 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 such 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.
Table 8-6 Configure MSDP peer connection control
Operation
Enter system view
Enter MSDP view
Shut down an MSDP peer
Configure retry interval of
setting up an MSDP peer
connection

8.4 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 in, a router does not send an 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.
To reduce the delay in obtaining the multicast source information, you can cache SA
messages on the router. The number of SA messages cached must not exceed the
system limit. The more messages cached, the more router memory occupied.
Command
system-view
msdp
shutdown peer-address
timer retry seconds
Huawei Technologies Proprietary
8-11
Chapter 8 MSDP Configuration
Description
—
—
Optional
Optional
The default value is 30
seconds.