Troubleshooting Mpls Configuration - H3C S9500 Series Operation Manual

Operation Manual – MPLS
H3C S9500 Series Routing Switches
# Enable OSPF on the interface connecting Switch C with Switch B.
[H3C] Router id 100.10.1.1
[H3C] ospf
[H3C-ospf-1] area 0
[H3C-ospf-1-area-0.0.0.0] network 100.10.1.0 0.0.0.255
4) Configure Switch D
# Configure LSR ID and enable MPLS and LDP.
[H3C] mpls lsr-id 172.17.1.2
[H3C] mpls
[H3C-mpls] quit
[H3C] mpls ldp
# Configure IP address and enable MPLS and LDP for VLAN interface 203.
[H3C] vlan 203
[H3C-vlan203] port gigabitethernet 2/1/3
[H3C-vlan203] quit
[H3C] interface vlan-interface 203
[H3C-Vlan-interface203] ip address 172.17.1.2 255.255.0.0
[H3C-Vlan-interface203] mpls
[H3C-Vlan-interface203] mpls ldp enable
# Enable OSPF on the interface connecting Switch D with Switch B.
[H3C] Router id 172.17.1.2
[H3C] ospf
[H3C-ospf-1] area 0
[H3C-ospf-1-area-0.0.0.0] network 172.17.0.0 0.0.255.255

2.6 Troubleshooting MPLS Configuration

Symptom: Session cannot be setup with the peer after LDP is enabled on the interface.
Troubleshooting:
Cause 1: Loop detection configuration is different at the two ends.
Solution: Check loop detection configuration at both ends to see if one end is
configured while the other end is not (this will result in session negotiation failure).
Cause 2: Local machine cannot get the route to peer LSR ID, so TCP connection
cannot be set up and session cannot be established.
Solution: The default address for session transfer is MPLS LSR ID. The local machine
should issue the LSR ID route (often the Loopback address) and lean the peer LSR ID
route.
Chapter 2 MPLS Basic Capability Configuration
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