HP 12500 Series Configuration Manual page 84

Such a BFD session can detect the connectivity of a unidirectional (from the local device to the
remote device) MPLS TE tunnel between two devices.
After you enable BFD and configure the mpls te failure-action teardown command for an MPLS TE tunnel,
once an RSVP-TE tunnel failure occurs, BFD can detect the failure, and if RSVP does not re-establish the
tunnel within a specific period of time, MPLS TE will remove the failed RSVP-TE tunnel and then
re-establish it.
Configuration guidelines
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 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.
Configuration prerequisites
The source address of the BFD session is the MPLS LSR ID. Before configuring BFD to inspect an
•
MPLS TE tunnel, make sure that there is a route on the peer device to the MPLS LSR ID. You can also
configure the BFD session parameters on the tunnel interface as needed. For more information
about BFD, see High Availability Configuration Guide.
• To establish a static BFD session to inspect an MPLS TE tunnel, make sure that there is already an LSP
from the local device to the remote device and an LSP from the remote device to the local device.
Configuring BFD for an MPLS TE tunnel
To configure BFD for an MPLS TE tunnel:
To do...
Enter system view
Enable LSP verification and enter
MPLS LSPV view
Return to system view
Enter the tunnel interface view of
an MPLS TE tunnel
Configure BFD to check the
connectivity of the MPLS TE tunnel
Configure MPLS TE to tear down a
failed RSVP TE tunnel and
reestablish it
Use the command...
system-view
mpls lspv
quit
interface tunnel tunnel-number
mpls te bfd enable [ discriminator
local local-id remote remote-id ]
mpls te failure-action teardown
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Remarks
—
Required
By default, LSP verification is
disabled.
—
—
Required
By default, BFD is not configured to
check connectivity of MPLS TE
tunnels.
Optional
Not configured by default