Periodic Mpls Tracert; Protocols And Standards; Configuring Mpls Oam For Lsp Tunnels; Configuring Mpls Ping For Lsps - HPE FlexFabric 5950 Series Configuration Manual

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Static mode—You manually specify the local and remote discriminators through command
lines to establish the BFD session.
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Dynamic mode—The system automatically runs MPLS ping to negotiate the discriminators to
establish the BFD session.
In static mode, the egress node returns a BFD control packet to the ingress node through the reverse
tunnel. If no reverse tunnel exists, the ingress node cannot receive the BFD control packet, resulting
in a verification failure.
In dynamic mode, the egress node returns a BFD control packet to the ingress node through the
reverse tunnel. If no reverse tunnel exists, the egress mode returns a BFD packet through IP routing.
Use the static mode to test the connectivity of a pair of LSPs or MPLS TE tunnels in opposite
directions between two devices. Use the dynamic mode to test the connectivity of one LSP or MPLS
TE tunnel from the local device to the remote device.
P eriodic MPLS tracert
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The periodic MPLS tracert feature automatically traces an LSP tunnel at intervals. It locates errors on
the LSP tunnel, verifies the consistency of the data plane and control plane, and records the
detected errors in system logs. You can check the logs to monitor LSP connectivity.
If both BFD and periodic MPLS tracert are configured for an LSP, and the periodic tracert feature
detects a data plane and control plane inconsistency, the device performs the following tasks:
1. Deletes the BFD session for the LSP.
2. Re-establishes the BFD session based on the control plane.

Protocols and standards

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RFC 4379, Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures

Configuring MPLS OAM for LSP tunnels

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To verify LSP connectivity, you can use one of the following methods:
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Use the ping mpls ipv4 command or the tracert mpls ipv4 command to trigger LSP
connectivity verification as needed.
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Configure BFD or periodic MPLS tracert for the system to automatically verify LSP connectivity.
C onfiguring MPLS ping for LSPs
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Perform the following task in any view:
Task
Use MPLS ping to verify MPLS LSP
connectivity for an IPv4 prefix.
C onfiguring MPLS tracert for LSPs
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Perform the following task in any view:
Command
ping mpls [ -a source-ip | -c count | -exp exp-value | -h
ttl-value | -m wait-time | -r reply-mode | -rtos tos-value | -s
packet-size | -t time-out | -v ] * ipv4 ipv4-address
mask-length [ destination start-address [ end-address
[ address-increment ] ] ]
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