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43-9
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter 43 Configuring MSDP
Configuring MSDP
Controlling Source Information that Your Switch Originates
You can control the multicast source information that originates with your switch:
• Sources you advertise (based on your sources)
• Receivers of source information (based on knowing the requestor)
For more information, see the “Redistributing Sources” section on page 43-9 and the “Filtering
Source-Active Request Messages” section on page 43-11.
Redistributing Sources
SA messages originate on RPs to which sources have registered. By default, any source that registers
with an RP is advertised. The A flag is set in the RP when a source is registered, which means the source
is advertised in an SA unless it is filtered.
Beginning in privileged EXEC mode, follow these steps to further restrict which registered sources are
advertised. This procedure is optional.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip msdp redistribute [list
access-list-name] [asn
aspath-access-list-number] [route-map
map]
Configure which (S,G) entries from the multicast routing table are
advertised in SA messages.
By default, only sources within the local domain are advertised.
• (Optional) For list access-list-name, enter the name or number of an
IP standard or extended access list. The range is 1 to 99 for standard
access lists and 100 to 199 for extended lists. The access list
controls which local sources are advertised and to which groups
they send.
• (Optional) For asn aspath-access-list-number, enter the IP standard
or extended access list number in the range 1 to 199. This access list
number must also be configured in the ip as-path access-list
command.
• (Optional) For route-map map, enter the IP standard or extended
access list number in the range 1 to 199. This access list number
must also be configured in the ip as-path access-list command.
The switch advertises (S,G) pairs according to the access list or
autonomous system path access list.