H3C Technologies H3C SR8800 User Manual
Page 94
83
NOTE:
•
For more information about the mpls lspv command, see
MPLS Command Reference.
•
The BFD session parameters are those configured on the MPLS TE tunnel interface. The source address
of the BFD session is the MPLS LSR ID. Therefore, before configuring BFD to inspect an MPLS TE tunnel,
make sure that there is a route on the peer router to the MPLS LSR ID, and you can also configure the BFD
session parameters on the tunnel interface as needed. For more information about BFD parameter
configuration, see
High Availability Configuration Guide.
•
You cannot establish both a static BFD session and a dynamic BFD session for the same MPLS TE tunnel.
•
Before establishing a static BFD session, make sure that there is already an MPLS TE tunnel from the local
router to the remote router and an MPLS TE tunnel from the remote router to the local router.
•
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 make sure 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. You can know whether an MPLS TE tunnel has failed by checking 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 specific period of time, MPLS TE will remove
the failed RSVP-TE tunnel and then re-establish it.
To configure periodic LSP tracert for an MPLS TE tunnel:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enable LSP verification and
enter MPLS LSPV view.
mpls lspv
By default, LSP verification is
disabled.
3.
Return to system view.
quit
N/A
4.
Enter the tunnel interface view
of an MPLS TE tunnel.
interface tunnel tunnel-number
N/A