H3C Technologies H3C S10500 Series Switches - Manual (Page 131)

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To do… Use the command… Remarks
Enter the tunnel interface view of
an MPLS TE tunnel
interface tunnel tunnel-number —
Configure BFD to check the
connectivity of the MPLS TE tunnel mpls te bfd enable [ discriminator
local local-id remote remote-id ]
Required
By default, BFD is not configured to
check connectivity of MPLS TE
tunnels.
Configure MPLS TE to tear down a
failed RSVP TE tunnel and
reestablish it
mpls te failure-action teardown
Optional
Not configured by default
For more information about the mpls lspv command, see MPLS Command Reference.
You cannot establish both a static BFD session and a dynamic BFD session for the same MPLS TE tunnel.
After establishing a static BFD session for an MPLS TE tunnel, you cannot modify the discriminator values
of the BFD session.
If you enable both FRR and BFD for an MPLS TE tunnel, to ensure that the BFD session will not be down
during an FRR switching, you need to give the BFD detection interval a greater value than the FRR
detection interval.
In a BFD session for detecting an MPLS TE tunnel’s connectivity, the ingress node always works in active
mode and the egress node always works in passive mode. The bfd session init-mode command does not
take effect on the ingress and egress nodes of such a BFD session. Even if you configure the two nodes
to both work in passive mode, the BFD session will still be established successfully.
Configuring Periodic LSP Tracert for an MPLS TE Tunnel
The periodic LSP tracert function for an MPLS TE tunnel is for locating faults of the MPLS TE tunnel
periodically. It detects the consistency of the forwarding and control plane and records detection results
into logs. To know whether an MPLS TE tunnel has failed, check the logs.
If you configure BFD as well as periodical tracert for an MPLS TE tunnel, once the periodical LSP tracert
function detects a fault or inconsistency of the forwarding plane and control plane of the MPLS TE tunnel,
the BFD session for the tunnel will be deleted and a new BFD session will be established according to the
control plane.
After you configure periodic LSP tracert and the mpls te failure-action teardown command for an MPLS
TE tunnel, once an RSVP-TE tunnel failure occurs, the periodic LSP tracert function can detect the failure,
and if RSVP does not re-establish the RSVP-TE tunnel within a specified period of time, MPLS TE will
remove the failed RSVP-TE tunnel and then re-establish it.
Follow these steps to configure periodic LSP tracert for an MPLS TE tunnel:
To do… Use the command… Remarks
Enter system view system-view —
Enable LSP verification and enter
MPLS LSPV view
mpls lspv
Required
By default, LSP verification is
disabled.
Return to system view quit —