BigIron RX Series Configuration Guide 63953-1001986-01DVMRP overview 23BigIron RX# clear ip msdp peer 205.216.162.1Remote connection closedSyntax: clear ip msdp peer The command in this example clears the MSDP peer connection with MSDP router 205.216.162.1.The CLI displays a message to indicate when the connection has been successfully closed.Clearing the source active cacheTo clear the entries from the Source Active cache, enter the following command at the PrivilegedEXEC level of the CLI.BigIron RX# clear ip msdp sa-cacheSyntax: clear ip msdp sa-cache [ | ]The command in this example clears all the cache entries. Use the parameter toclear only the entries for a specified course. Use the parameter to clear only theentries for a specific group.Clearing MSDP statisticsTo clear MSDP statistics, enter the following command at the Privileged EXEC level of the CLI.BigIron RX# clear ip msdp statisticsSyntax: clear ip msdp statistics []The command in this example clears statistics for all the peers. To clear statistics for only a specificpeer, enter the peer’s IP address.DVMRP overviewThe BigIron RX provides multicast routing with the Distance Vector Multicast Routing Protocol(DVMRP) routing protocol. DVMRP uses IGMP to manage the IP multicast groups.DVMRP is a broadcast and pruning multicast protocol that delivers IP multicast datagrams to itsintended receivers. The receiver registers the interested groups using IGMP. DVMRP builds amulticast delivery tree with the sender forming the root. Initially, multicast datagrams are deliveredto all nodes on the tree. Those leaves that do not have any group members send prune messagesto the upstream router, noting the absence of a group. The upstream router maintains a prunestate for this group for the given sender. A prune state is aged out after a given configurableinterval, allowing multicasts to resume.DVMRP employs reverse path forwarding and pruning to keep source specific multicast deliverytrees with the minimum number of branches required to reach all group members. DVMRP builds amulticast tree for each source and destination host group.
