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| Title | Size | Download |
|---|---|---|
| 06-MPLS OAM configuration | 57.26 KB |
Configuring MPLS OAM
Overview
When an MPLS LSP tunnel fails, the control plane cannot detect or promptly detect the failure. To quickly detect and locate MPLS forwarding failures, the device provides the following mechanisms:
· MPLS ping—Tests the connectivity of an LSP tunnel. At the ingress node, MPLS ping adds the label associated with a tunnel into an MPLS echo request and sends it to the egress node over the tunnel. The egress node processes the request and returns an MPLS echo reply to the ingress node. An MPLS echo reply carrying a success notification indicates that the tunnel is available for data forwarding, and an MPLS echo reply carrying an error code indicates that the tunnel has failed.
· MPLS traceroute—Displays the path that an MPLS LSP tunnel traverses from the ingress node to the egress node to locate errors on the tunnel. MPLS traceroute consecutively sends MPLS echo requests along the LSP tunnel, with the TTL increasing from 1 to a specific value. Then, each hop along the tunnel returns an MPLS echo reply to the ingress due to TTL timeout. So, the ingress can collect the information of each hop along the tunnel. From the information, you can locate the failed node or get the important information of each hop, such as the label allocated by each downstream hop.
MPLS ping
To configure MPLS ping:
|
Task |
Command |
Remarks |
|
Use MPLS LSP ping to test MPLS LSP connectivity for an IPv4 prefix. |
ping mpls [ -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 destination-ip-addr-header ] |
Available in any view. |
MPLS traceroute
To configure MPLS traceroute:
|
Task |
Command |
Remarks |
|
Use MPLS traceroute to trace the LSPs for an IPv4 prefix. |
tracert mpls [ -a source-ip | -exp exp-value | -h ttl-value | -r reply-mode |-t time-out ] * ipv4 dest-addr mask-length [ destination destination-ip-addr-header ] |
Available in any view. |
