Troubleshooting Mpls - H3C S9500 Series Operation Manual

Operation Manual – MPLS Basics
H3C S9500 Series Routing Switches
round-trip min/avg/max = 1/1/1 ms

1.15 Troubleshooting MPLS

Symptom:
An interface with LDP enabled cannot establish an LDP session with its peer.
Analysis:
An LDP session is established in two steps: establishing the TCP connection;
initializing the session and negotiating the session parameters. Failure in either of the
steps will lead to the failure of LDP session establishment.
The TCP connection established uses LSR ID as the address by default. Therefore, if
you do not configure the mpls ldp transport-address command, the route to the
address of LSR ID must be advertised to the peer.
Solution:
Check whether the current LSR has obtained the route to the LSR ID of the peer
by issuing the display ip routing-table command.
Check whether the label advertisement mode configured locally is the same as
that configured for the peer using the display mpls ldp interface command.
If not, use the mpls ldp advertisement command to correct the configuration.
Chapter 1 MPLS Basics Configuration
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