MPLS Guide MPLS and RSVP-TE
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The registration of an RSVP-TE interface with BFD is performed independently of whether
RSVP-TE hello is enabled on the interface or not. However, hello timeout clears all sessions
toward the neighbor and RSVP-TE deregisters with BFD at the clearing of the last session.
An RSVP-TE session is associated with a neighbor based on the interface address that the
PATH message is sent to. If multiple interfaces exist to the same node, each interface is
treated as a separate RSVP-TE neighbor. The user must enable BFD on each interface, and
RSVP-TE will register with the BFD session running with each of those neighbors
independently.
Similarly, disabling BFD on the interface results in removing registration of the interface with
BFD.
When a BFD session transitions to the down state, the following actions are triggered. For
RSVP-TE signaled LSPs, this triggers activation of FRR bypass or detour backup LSPs (PLR
role), global revertive (head-end role), and switchover to secondary (if any) (head-end role)
for affected LSPs with FRR enabled. It triggers a switchover to secondary (if any) and
scheduling of retries for signaling the primary path of the non-FRR-affected LSPs (head-end
role).
The no form of this command removes BFD from the associated RSVP-TE protocol
adjacency.
Default no bfd-enable
hello-interval
Syntax hello-interval milli-seconds
no hello-interval
Context config>router>rsvp>interface
Description This command configures the time interval between RSVP-TE hello messages.
RSVP-TE hello packets are used to detect loss of RSVP-TE connectivity with the neighboring
node. Hello packets detect the loss of a neighbor more quickly than it would take for the
RSVP-TE session to time out based on the refresh interval. After the loss of the of
keep-multiplier number consecutive hello packets, the neighbor is declared to be in a down
state.
The no form of this command reverts to the default value of the hello-interval. To disable
sending hello messages, set the value to zero.
Default 3000
Parameters milli-seconds — specifies the RSVP-TE hello interval in milliseconds, in multiples of
1000. A 0 (zero) value disables the sending of RSVP-TE hello messages.
Values 0 to 60000 milliseconds (in multiples of 1000)
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