121
Inspecting an MPLS TE tunnel
When an MPLS TE tunnel fails or affects data forwarding due to performance degradation, the control
plane cannot detect the fault or cannot do so in time. This brings difficulty to network maintenance. To
detect MPLS TE tunnel failures in time and locate the failed node, the device provides the following
mechanisms:
• MPLS LSP ping
• MPLS LSP tracert
• BFD for an MPLS TE tunnel
• Periodic tracert of an MPLS TE tunnel
Configuring MPLS LSP ping
Use MPLS LSP ping to test the connectivity of an MPLS TE tunnel. At the ingress, it adds the label of the
tunnel into an MPLS echo request, and sends it along the MPLS TE tunnel to the egress. The ingress
determines whether the MPLS TE tunnel is normal according to whether it can receive a reply from the
egress.
To test the connectivity of an MPLS TE tunnel, perform the following task in any view:
Task Command
Use MPLS LSP ping to test the connectivity of an
MPLS TE tunnel.
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 ] * te interface-type interface-number
Configuring MPLS LSP tracert
Use MPLS LSP tracert to locate errors of an MPLS TE tunnel. It sends MPLS echo requests to the nodes
along the MPLS TE tunnel to be inspected, with the TTL increasing from 1 to a specific value. Each node
along the MPLS TE tunnel returns an MPLS echo reply to the ingress due to TTL timeout. Thus, the ingress
can collect the information of each hop along the MPLS TE tunnel, so as to locate the failed node. You
can also use MPLS LSP tracert to collect information about each hop along the MPLS TE tunnel, such as
the label allocated.
To locate errors of an MPLS TE tunnel, perform the following task in any view:
Task Command
Use MPLS LSP tracert to locate errors of an MPLS TE
tunnel.
tracert lsp [ -a source-ip | -exp exp-value | -h ttl-value
| -r reply-mode |-t time-out ] * te interface-type
interface-number
Configuring BFD for an MPLS TE tunnel
You can configure BFD for an MPLS TE tunnel to implement fast detection of the connectivity of the tunnel.
After you configure BFD for an MPLS TE tunnel, a BFD session is established between the ingress and
egress of the tunnel, and the ingress adds the label for the tunnel into a BFD control packet, forward the
BFD control packet along the tunnel, and determine the status of the tunnel according to the BFD control
To Next Page
Loading...
Need help?
General
