Sa Request Filters; How To Use Msdp To Interconnect Multiple Pim-Sm Domains; Configuring An Msdp Peer - Cisco Catalyst 3650 Configuration Manual

SA Request Filters

If an noncaching RP has an MSDP peer that is caching SAs, you can reduce the join latency for a noncaching
peer by enabling the noncaching peer to send SA request messages. When a host requests a join to a particular
group, the noncaching RP sends an SA request message to its caching peers. If a peer has cached source
information for the group in question, it sends the information to the requesting RP with an SA response
message. The requesting RP uses the information in the SA response but does not forward the message to any
other peers. If a noncaching RP receives an SA request, it sends an error message back to the requestor.
In all current and supported software releases, caching of MSDP SA messages is mandatory and cannot
Note
be manually enabled or disabled. By default, when an MSDP peer is configured, the configured commands
are automatically added to the running configuration.
SA Request Filters
By default, a device honors all outgoing SA request messages from its MSDP peers; that is, it sends cached
source information to requesting MSDP peers in SA response messages. You can control the outgoing SA
request messages that a device will honor from specified peers by creating an SA request filter. An SA request
filter controls the outgoing SA requests that the device will honor from MSDP peers as follows:
• You can filter all SA request messages from a specified peer by configuring the device to ignore all SA
• You can filter a subset of SA request messages from a specified peer based on groups defined in a

How to Use MSDP to Interconnect Multiple PIM-SM Domains

The first task is required; all other tasks are optional.

Configuring an MSDP Peer

By enabling an MSDP peer, you implicitly enable MSDP.
Note
Before You Begin
• IP multicast routing must be enabled and PIM-SM must be configured.
• With the exception of a single MSDP peer, default MSDP peer, and MSDP mesh group scenarios, all
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
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requests from the specified MSDP peer.
standard access list by configuring the device to honor only SA request messages from the MSDP peer
that match the groups defined in a standard access list. SA request messages from the specified peer for
other groups will be ignored.
MSDP peers must be configured to run BGP prior to being configured for MSDP.
Configuring MSDP
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