SA Messages
SA messages are used to advertise active sources in a domain. In addition, these SA messages may contain
the initial multicast data packet that was sent by the source.
SA messages contain the IP address of the originating RP and one or more (S, G) pairs being advertised. In
addition, the SA message may contain an encapsulated data packet.
For more information about SA messages, see the SA Message Origination Receipt and Processing, on
page 174 section.
Note
SA Request Messages
SA request messages are used to request a list of active sources for a specific group. These messages are sent
to an MSDP SA cache that maintains a list of active (S, G) pairs in its SA cache. Join latency can be reduced
by using SA request messages to request the list of active sources for a group instead of having to wait up to
60 seconds for all active sources in the group to be readvertised by originating RPs.
For more information about SA request messages, see the Requesting Source Information from MSDP
Peers, on page 199 section.
Note
SA Response Messages
SA response messages are sent by the MSDP peer in response to an SA request message. SA response messages
contain the IP address of the originating RP and one or more (S, G) pairs of the active sources in the originating
RP’s domain that are stored in the cache.
For more information about SA response messages, see the Controlling the Response to Outgoing SA
Request Messages from MSDP Peers Using SA Request Filters, on page 200 section.
Note
Keepalive Messages
Keepalive messages are sent every 60 seconds in order to keep the MSDP session active. If no keepalive
messages or SA messages are received for 75 seconds, the MSDP session is reset.
For more information about keepalive messages, see the Adjusting the MSDP Keepalive and Hold-Time
Intervals, on page 190 section.
Note
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
OL-29890-01 173
Configuring MSDP
MSDP Message Types
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