Fec Resolution - Alcatel-Lucent 7450 Manual

Ethernet service switch

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Operation of LDP over an Unnumbered IP Interface

FEC Resolution

LDP will advertise/withdraw unnumbered interfaces using the Address/Address-Withdraw

message. The borrowed IP address of the interface is used.

A FEC can be resolved to an unnumbered interface in the same way as it is resolved to a numbered

interface. The outgoing interface and next-hop are looked up in RTM cache. The next-hop consists

of the router-id and link identifier of the interface at the peer LSR.

LDP FEC ECMP next-hops over a mix of unnumbered and numbered interfaces is supported.

All LDP FEC types are supported.

The fec-originate command is supported when the next-hop is over an unnumbered interface.

All LDP features are supported except for the following:

BFD cannot be enabled on an unnumbered LDP interface. This is a consequence of the

fact that BFD is not supported on unnumbered IP interface on the 7x50 system.

As a consequence of (1), LDP FRR procedures will not be triggered via a BFD session

timeout but only by physical failures and local interface down events.

Unnumbered IP interfaces cannot be added into LDP global and peer prefix policies.

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