5-10between faulty MSDP peers or bringing faulty MSDP peers back to work, you can adjust the retryinterval of establishing a peering relationship through the following configuration.Follow these steps to configure MSDP peer connection control:To do... Use the command... RemarksEnter system view system-view —Enter MSDP view msdp —Shut down the connection with thespecified MSDP peer shutdown peer-addressOptionalBy default, all MSDP peeringconnections are up.Configure the retry interval ofMSDP peer connectionestablishmenttimer retry seconds Optional30 seconds by defaultConfiguring SA Message TransmissionAn SA message contains the IP address of the multicast source S, multicast group address G, and RPaddress. In addition, it contains the first multicast data received by the RP in the domain where themulticast source resides. For some burst multicast data, if the multicast data interval exceeds the SAmessage hold time, the multicast data must be encapsulated in the SA message; otherwise, thereceiver 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 MSDPpeer but has to wait for the next SA message. This defers the reception of the multicast information bythe receiver. In order for the new receiver to know about the currently active multicast source as quicklyas 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 allMSDP peers. By configuring the rules for filtering SA messages to receive/send, you can effectivelycontrol the transmission of SA messages among MSDP peers. For forwarded SA messages, you canalso configure a Time-to-Live (TTL) threshold to control the range where SA messages carryingencapsulated data are transmitted.To reduce the delay in obtaining the multicast source information, you can cache SA messages on therouter. The number of SA messages cached must not exceed the system limit. The more messages arecached, the more router memory is occupied.Configuration PrerequisitesBefore you configure SA message transmission, perform the following tasks:z Configuring a unicast routing protocol.z Configuring basic IP multicast functions.z Configuring basic PIM-SM functions.z Configuring basic MSDP functions.Complete the following tasks to configure SA message transmission:Task RemarksConfiguring RP Address in SA Messages OptionalConfiguring SA Message Cache Optional
