Alcatel-Lucent 7450 Manual page 666

Ethernet service switch

Hide thumbs Also See for 7450:

Table of Contents

config>router>ldp>interface parameters>interface

This command enables the context to configure IPv6 LDP parameters applied to the interface.

bfd-enable [ipv4][ipv6]

no bfd-enable

config>router>ldp>if-params>if

This command enables tracking of the Hello adjacency to an LDP peer using BFD.

When this command is enabled on an LDP interface, LDP registers with BFD and starts tracking the

LSR-id of all peers it formed Hello adjacencies with over that LDP interface. The LDP hello

mechanism is used to determine the remote address to be used for the BFD session. The parameters

used for the BFD session, that is, transmit-interval, receive-interval, and multiplier are those

configured under the IP interface in existing implementation: config>router>interface>bfd

The operation of BFD over an LDP interface tracks the next-hop of the IPv4 and IPv6 prefixes in

addition to tracking the LDP peer address of the Hello adjacency over that link. This is required since

LDP can resolve both IPv4 and IPv6 prefix FECs over a single IPv4 or IPv6 LDP session and as such

the next-hop of a prefix will not necessarily match the LDP peer source address of the Hello

The failure of either or both of the BFD session tracking the FEC next-hop and the one tracking the

Hello adjacency will cause the LFA backup NHLFE for the FEC to be activated or the FEC to be re-

resolved if there is no FRR backup.

When multiple links exist to the same LDP peer, a Hello adjacency is established over each link and

a separate BFD session is enabled on each LDP interface. If a BFD session times out on a specific

link, LDP will immediately associate the LDP session with one of the remaining Hello adjacencies

and trigger the LDP FRR procedures. As soon as the last Hello adjacency goes down due to BFD

timing out, the LDP session goes down and the LDP FRR procedures will be triggered.

The no form of this command disables BFD on the LDP interface.

no bfd-enable

7450 ESS MPLS Guide