3Com Switch 8800 Configuration Guide Chapter 30 MSDP Configuration30-9I. Using MSDP outbound filterMSDP outbound filter of are functional in:z Filtering off all the (S, G) entriesz Forwarding only the SA messages permitted by the advanced ACLPlease perform the following configurations in MSDP view.Table 30-10 Using MSDP outbound filter to control the source information forwardedOperation CommandFilter off all the SA messages to a specifiedMSDP peerpeer peer-address sa-policyexportForward the SA messages permitted by theadvanced ACL to a specified MSDP peerpeer peer-address sa-policyexport [ acl acl-number ]Remove the filtering over the sourceinformation forwardedundo peer peer-addresssa-policy exportII. Using TTL to filter SA messages with encapsulated dataAn SA message with encapsulated data can reach the specified MSDP peer only whenthe TTL in its IP header is no less than the threshold. Therefore, the forwarding of SAmessages with encapsulated data can be controlled by configuring the TTL threshold.For example, you can set the TTL theshold for intra-domain multicast traffic as 10 if youwish to restrict SA messages with TTL less than or equal to 10 carrying encapsulateddata from being propagated. If you set the TTL threshold greater than 10, then they canbe propagated to outside.Please perform the following configurations in MSDP view.Table 30-11 Using TTL to filter SA messages with encapsulated dataOperation CommandFilter off the multicast data encapsulated inthe first SA message aiming at a specifiedMSDP peerpeer peer-address minimum-ttl ttlRemove the TTL threshold configuration undo peer peer-addressminimum-ttlThe default value of TTL threshold is 0.30.2.10 Controlling the Received Source InformationPlease perform the following configurations in MSDP view.
