Alcatel-Lucent 7450 Manual page 302

Interface Commands
Parameters
name — Specifies the name of the keychain, up to 32 characters, to use for the specified protocol
session or sessions.
bfd-enable
Syntax [no] bfd-enable
Context config>router>rsvp>interface
Description This command enables the use of bi-directional forwarding (BFD) to control the state of the
associated RSVP interface. This causes RSVP to register the interface with the BFD session on that
interface.
The user configures the BFD session parameters, such as, transmit-interval, receive-interval, and
multiplier, under the IP interface in the config>router> interface>bfd context.
Note that it is possible that the BFD session on the interface was started because of a prior
registration with another protocol, for example, OSPF or IS-IS.
The registration of an RSVP interface with BFD is performed at the time of neighbor gets its first
session. This means when this node sends or receives a new Path message over the interface. If
however the session did not come up, due to not receiving a Resv for a new path message sent after
the maximum number of re-tries, the LSP is shutdown and the node de-registers with BFD. In
general, the registration of RSVP with BFD is removed as soon as the last RSVP session is cleared.
The registration of an RSVP interface with BFD is performed independent of whether RSVP hello is
enabled on the interface or not. However, hello timeout will clear all sessions towards the neighbor
and RSVP de-registers with BFD at clearing of the last session.
Note that an RSVP session is associated with a neighbor based on the interface address the path
message is sent to. If multiple interfaces exist to the same node, then each interface is treated as a
separate RSVP neighbor. The user will have to enable BFD on each interface and RSVP will register
with the BFD session running with each of those neighbors independently
Similarly the disabling of BFD on the interface results in removing registration of the interface with
BFD.
When a BFD session transitions to DOWN state, the following actions are triggered. For RSVP
signaled LSPs, this triggers activation of FRR bypass/detour backup (PLR role), global revertive
(head-end role), and switchover to secondary if any (head-end role) for affected LSPs with FRR
enabled. It triggers switchover to secondary if any and scheduling of re-tries 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 protocol adjacency.
Default no bfd-enable
Page 302 7450 ESS MPLS Guide