3Com Switch 8800 Configuration Guide Chapter 30 MSDP Configuration30-730.2.6 Configuring the Maximum Number of SA cachingTo prevent DoS (Deny of Service) attacks, you can set the maximum number of SAscached on the router.Perform the following configuration in MSDP view.Table 30-6 Configuring the maximum number of SA cachingOperation CommandConfiguring the maximum number of SAcachingpeer peer-address sa-cache-maximumsa-limitRestore the default configuration undo peer peer-addresssa-cache-maximumBy default, the maximum number of SA caching is 2048.30.2.7 Requesting Source Information of MSDP PeersWhen a new group joins, the router will send a SA request message to the specifiedMSDP peer, and the MSDP peer will respond with the SA messages it caches. If theMSDP peer does not enable the SA caching, the configuration is invalid.Please perform the following configurations in MSDP view.Table 30-7 Requesting source information of MSDP peersOperation CommandConfigure the router to send SA request message tothe specified MSDP peer when receiving the joinmessage of a grouppeer peer-addressrequest-sa-enableRestore the default configuration undo peer peer-addressrequest-sa-enableThe SA request message sent by a local RP will get the immediate response about allactive sources.By default, the router does not send SA request message to its MSDP peer whenreceiving the join message of a group. Instead, it waits for the arrival of SA message ofthe next period.30.2.8 Controlling the Source Information CreatedI. Filtering the multicast routing entries importedRP filters the registered sources to control the information of the active sourcesadvertised in SA message. MSDP peers can be configured to only advertise the
