Cisco Systems A9014CFD Using LSP Ping for LDP IPv4 FEC, Using LSP Traceroute for LDP IPv4 FEC

Chapter 17 Configuring MPLS OAM

Configuring MPLS OAM

Note On Cisco ASR 901, for a default MTU of 1500 bytes, IOS supports MPLS ping up to 1486 bytes. For MPLS ping with size more than 1486 bytes to work in Cisco ASR 901, the MTU setting on the SVI has to be adjusted to be more than 1500 bytes.

Using LSP Ping for LDP IPv4 FEC

When you enter the ping mpls privileged EXEC command to begin an LSP ping operation, the keyword that follows specifies the Forwarding Equivalence Class (FEC) that is the target of the LSP ping to which you want to verify connectivity.

Command	Purpose
ping mpls ipv4	To verify LSP path from Cisco ASR 901 to remote peer. The
destination-address	keywords have these meanings:
destination-mask	• destination-address destination-mask—Specify the address and
	network mask of the target FEC.

Using LSP Traceroute for LDP IPv4 FEC

The LSP traceroute originator sends incremental MPLS echo requests to discover the downstream mapping of each successive hop. When the originating provider edge router receives the reply from the intermediate router, it forms another MPLS echo request with the same target FEC and the time-to-live is incremented by one.

Command	Purpose
traceroute mpls ipv4 destination-address	To configure LSP IPv4 traceroute.
destination-mask	• destination-address destination-mask is the address
	and network mask of the target FEC.

Using LSP Ping for Pseudowire

Use the ping mpls pseudowire command to verify the AToM pseudowire path.

Command	Purpose
ping mpls pseudowire ipv4-addressvc_id	To verify AToM pseudowire path from the ASR 901
vc-id-value	router to remote peer.
	•	ipv4-addressis the ip address of the remote peer.
	•	vc_id is the virtual circuit id.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		17-3