Layer 3 VPN Monitoring and Troubleshooting

Table 57 summarizes the command-line interface (CLI) commands you can use to monitor Layer 3 Virtual Private Networks (VPNs). In the table, the commands are grouped by functionality. In the remainder of this chapter, they are explained alphabetically.

These commands have been condensed and grouped to specifically address VPNs, with references to the complete command elsewhere in this book.

Table 57: Commands for Monitoring Layer 3 VPNs

Task Category	Task or Information to Monitor	Command
BGP Monitoring Information	Entries in the BGP neighbor database.	show bgp neighbor
	BGP summary information.	show bgp summary
Forwarding Table Information	Information about the entries in the kernel's forwarding table.	show route forwarding-table
OSPF Monitoring Information	Link-state database entries.	show ospf database
	Status of interfaces on which OSPF is running.	show (ospf | ospf3) interface
	SPF log.	show ospf log
	OSPF neighbor.	show ospf neighbor
	OSPF routing table entries.	show ospf route
	General OSPF statistics.	show ospf statistics
RIP Monitoring Information	Display information about all RIP neighbors.	show rip neighbor
	Display rip protocol statistics.	show rip statistics
Routing Table Information	Information about the entries in the routing tables.	show route
	Routes transmitted by a particular routing protocol.	show route advertising-protocol
	Route instance information.	show route instance
	Routes learned by the specified protocol.	show route protocol
	Routes received by a particular routing protocol.	show route receive-protocol
	Routes in a particular routing table.	show route table
System Management	Check the reachability of a remote VPN node.	ping vpn-interface
	Open secure shell connections between the local router and a remote system.	ssh
	Open a telnet session to a remote system.	telnet
	Determine the route to a host.	traceroute