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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
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.
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.
Using LSP Ping for Pseudowire
Use the ping mpls pseudowire command to verify the AToM pseudowire path.
Command Purpose
ping mpls ipv4
destination-address
destination-mask
To verify LSP path from Cisco ASR 901 to remote peer. The
keywords have these meanings:
• destination-address destination-mask—Specify the address and
network mask of the target FEC.
Command Purpose
traceroute mpls ipv4 destination-address
destination-mask
To configure LSP IPv4 traceroute.
• destination-address destination-mask is the address
and network mask of the target FEC.
Command Purpose
ping mpls pseudowire ipv4-address vc_id
vc-id-value
To verify AToM pseudowire path from the ASR 901
router to remote peer.
• ipv4-address is the ip address of the remote peer.
• vc_id is the virtual circuit id.