Foundry Configuration Guide for the FESX, FSX, and FWSX
19 - 52 © Foundry Networks, Inc. December 2005
Clearing MSDP Information
You can clear the following MSDP information:
•Peer information
• Source Active cache
• MSDP statistics
Clearing Peer Information
To clear MSDP peer information, enter the following command at the Privileged EXEC level of the CLI:
FastIron SuperX Router# clear ip msdp peer 205.216.162.1
Remote connection closed
Syntax: clear ip msdp peer <ip-addr>
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 Cache
To clear the entries from the Source Active cache, enter the following command at the Privileged EXEC level of the
CLI:
FastIron SuperX Router# clear ip msdp sa-cache
Syntax: clear ip msdp sa-cache [<source-addr> | <group-addr>]
The command in this example clears all the cache entries. Use the <source-addr> parameter to clear only the
entries for a specified course. Use the <group-addr> parameter to clear only the entries for a specific group.
Clearing MSDP Statistics
To clear MSDP statistics, enter the following command at the Privileged EXEC level of the CLI:
FastIron SuperX Router# clear ip msdp statistics
Syntax: clear ip msdp statistics [<ip-addr>]
The command in this example clears statistics for all the peers. To clear statistics for only a specific peer, enter the
peer’s IP address.
DVMRP Overview
Foundry routers provide multicast routing with the Distance Vector Multicast Routing Protocol (DVMRP)
routing protocol. DVMRP uses Internet Group Membership Protocol (IGMP) to manage the IP multicast
groups.
DVMRP is a broadcast and pruning multicast protocol that delivers IP multicast datagrams to its intended
receivers. The receiver registers the interested groups using IGMP. DVMRP builds a multicast delivery tree with
the sender forming the root. Initially, multicast datagrams are delivered to all nodes on the tree. Those leaves that
do not have any group members send prune messages to the upstream router, noting the absence of a group.
The upstream router maintains a prune state for this group for the given sender. A prune state is aged out after a
given configurable interval, allowing multicasts to resume.
Age The number of seconds the entry has been in the cache
Table 19.4: MSDP Source Active Cache (Continued)
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