Operation of LDP over an Unnumbered IP Interface
Page 540 7450 ESS MPLS Guide
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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