Discovering IP address to use for uBFD sessions

["Bhatia, Manav (Manav)" <[e-mail]>]

Hi,

draft-ietf-bfd-on-lags is silent on how the IP address used for micro BFD sessions is derived/learnt/discovered.

It wisely assumes that an out-of-band mechanism exists which arms the routers with the knowledge about the remote IP address that it must use to establish the micro BFD session.

Some time back few of us wrote a short draft - draft-mmsn-bfd-on-lags-address-00, that describes how routers can obtain/discover remote IP addresses required for establishing uBFD sessions.

I would like the WG members to go through the above draft and discuss whether we need a draft that describes alternate ways to discover remote IP addresses or can we all assume that the remote IP addresses MUST be statically configured. 

The problem with implicitly assuming that the remote IP addresses MUST be configured is that as more folks start implementing this, they would stumble upon this issue and would be left clueless on how the IP addresses have to be derived. In case the WG decides that its premature to work on an autodiscovery mechanism, I would still like us to publish a draft that says that addresses MUST be statically configured and an Appendix where alternate mechanisms are listed along with their pros and cons (mostly for the sake of posterity).

Cheers, Manav