R2511-HP MSR Router Series MPLS Configuration Guide(V5)

Configuring MPLS LSP ping

MPLS LSP ping is for testing the connectivity of an LSP. At the ingress, it adds the label for the FEC to be

inspected into an MPLS echo request, which then is forwarded along the LSP to the egress. The egress

processes the request packet and returns an MPLS echo reply to the ingress. An MPLS echo reply carrying

a success notification indicates that the LSP is normal, and an MPLS echo reply carrying an error code

indicates that the LSP has failed.

To test the connectivity of an LSP, perform the following task in any view:

Task Command

Use MPLS LSP ping to test MPLS LSP

connectivity.

ping lsp [ -a source-ip | -c count | -exp exp-value | -h ttl-value | -m

wait-time | -r reply-mode | -s packet-size | -t time-out | -v ] * ipv4

dest-addr mask-length [ destination-ip-addr-header ]

Configuring MPLS LSP tracert

MPLS LSP tracert is for locating LSP errors. It consecutively sends the MPLS echo requests along the LSP to

be inspected, with the TTL increasing from 1 to a specific value. Then, each hop along the LSP returns an

MPLS echo reply to the ingress due to TTL timeout. So, the ingress can collect the information of each hop

along the LSP, so as to locate the failed node. You can also use MPLS LSP tracert to collect the important

information of each hop along the LSP, such as the label allocated.

To locate errors of an LSP, perform the following task in any view:

Task Command

Perform MPLS LSP tracert to locate

errors along an MPLS LSP.

tracert lsp [ -a source-ip | -exp exp-value | -h ttl-value | -r reply-mode |-t

time-out ] * ipv4 dest-addr mask-length [ destination-ip-addr-header ]

Enabling MPLS trap

With the MPLS trap function enabled, trap packets of the notifications level are generated to report

critical MPLS events. Such trap packets are sent to the information center of the device. Whether and

where the packets are output depend on the configurations of the information center. For information on

how to configure the information center, see Network Management and Monitoring Configuration

Guide.

To enable the MPLS trap function:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enable the MPLS trap.

snmp-agent trap enable mpls

By default, the MPLS trap is

disabled.

For more information about the

command, see the snmp-agent

trap enable command in Network

Management and Monitoring

Command Reference.