3com 5500-ei pwr Installation Instruction

 

13 

Configure a rule for filtering the 
SA messages received by an 
MSDP peer 

peer peer-address 
sa-request-policy [ acl 
acl-number ] 

Optional 

By default, a router receives all SA 
request messages from the MSDP 
peer. 

 

An RP filters each registered source to control the information of active sources advertised in the SA 

message. An MSDP peer can be configured to advertise only the (S, G) entries in the multicast routing 

table that satisfy the filtering rule when the MSDP creates the SA message; that is, to control the (S, G) 

entries to be imported from the multicast routing table to the PIM-SM domain. If the import-source 

command is executed without the acl keyword, no source will be advertised in the SA message.  

Follow these steps to configure a rule for filtering multicast sources using SA messages:  

Enter system view 

— 

Enter MSDP view 

— 

Configure to filter multicast 
sources using SA messages  

import-source [ acl 
acl-number ] 

Optional 

By default, all the (S, G) entries 
in the domain are advertised in 
the SA message.  

 

Besides the creation of source information, controlling multicast source information allows you to 

control the forwarding and reception of source information. You can control the reception of SA 

messages using the MSDP inbound filter (corresponding to the import keyword); you can control the 

forwarding of SA messages by using either the MSDP outbound filter (corresponding to the export 

argument) or the TTL threshold. MSDP inbound/outbound filter implements the following functions:  

z 

Filtering out all (S, G) entries 

z 

Receiving/forwarding only the SA messages permitted by advanced ACL rules (You can configure 

ACL rules for filtering source IP addresses and group IP addresses.) 

An SA message carrying encapsulated data can reach the specified MSDP peer outside the domain 

only if the TTL in its IP header is greater than the threshold; therefore, you can control the forwarding 

range of SA messages that carry encapsulated data by configuring the TTL threshold.  

Follow these steps to configure a rule for filtering received and forwarded SA messages:  

Enter system view 

— 

Enter MSDP view 

—