Using Tracert to Check the Forwarding Path on a P2MP MPLS Network

Run the tracert commands to check path information on a Point-to-Multipoint (P2MP) MPLS network so that faults can be located.

Usage Scenario

On a VPLS over P2MP network, tracert can be used to check the following tunnels:

P2MP label distribution protocol (LDP) label switched paths (LSPs)
P2MP TE tunnels that are automatically generated

Pre-configuration Tasks

Before using tracert to check the P2MP network connectivity, ensure that P2MP is correctly configured.

Procedure

Run the tracert multicast-lsp command to check path information about the following tunnels on a VPLS over P2MP network:

VPLS over P2MP LDP LSPs

tracert multicast-lsp [ -a source-ip | -exp exp-value | -h ttl-value | -j jitter-value | -r reply-mode | -t time-out | t-flag ] ^* mldp p2mp root-ip root-ip-address { lsp lsp-id | opaque-value opaque-value } [ detail ]
VPLS over P2MP TE tunnels that are automatically generated

tracert multicast-lsp [ -a source-ip | -exp exp-value | -h ttl-value | -j jitter-value | -r reply-mode | -t time-out | t-flag ] ^* te-auto-tunnel auto-tunnel-name [ leaf-destination leaf-destination ] [ detail ]

# Use tracert to check path information about a P2MP LDP LSP.

<HUAWEI> tracert multicast-lsp -h 10 mldp p2mp root-ip 1.1.1.1 lsp-id 1
  LSP Trace Route FEC: Multicast P2MP LDP , press CTRL_C to break.
  TTL   Replier            Time    Type      Downstream
  1     192.168.1.9        40 ms   Transit   192.168.2.12/[1024 ]
  2     10.10.10.10        110 ms  Egress
  3     10.10.10.10        140 ms  Egress
  4     10.10.10.10        50 ms   Egress
  5     10.10.10.10        70 ms   Egress
  6     10.10.10.10        80 ms   Egress
  7     10.10.10.10        70 ms   Egress
  8     10.10.10.10        30 ms   Egress
  9     10.10.10.10        60 ms   Egress
  10    10.10.10.10        110 ms  Egress

# Use tracert to check path information about a P2MP TE tunnel.

<HUAWEI> tracert multicast-lsp -h 2 te-auto-tunnel P2MPoh5121
  LSP Trace Route FEC: RSVP P2MP IPv4 P2MP-Auto-tunnel P2MPoh5121 , press CTRL_C to break.
  TTL   Replier            Time    Type      Downstream
  1     2.2.2.2            30 ms   Bud       172.16.3.2/[1048575 ]
  1     4.1.1.2            40 ms   Transit   5.1.1.2/[900001 ]
  2     2.2.2.2            30 ms   Bud       172.16.3.2/[1048575 ]
  2     6.6.6.6            60 ms   Egress
  2     3.3.3.3            80 ms   Egress
  2     5.5.5.5            80 ms   Egress