[Softwires] MAP-E 1:1 for HA

["Lee, Yiu" <[e-mail]>]

I have a question for the HA design concept of MAP-E 1:1. The central theme
of MAP-E is to make BR as stateless as possible and use Anycast address to
identify the MAP-E BR. However, if we use MAP-E 1:1 mode, the operator must
have to pre-provision all the subscribe rules to all the BRs sharing the
same Anycast address for reliable HA. This requires operators to carefully
plan out which BRs support which subscribers. It is because BR is
"per-subscriber stateful" in MAP-E 1:1 mode. Compared to the MAP-E design,
HA in MAP-E only requires the operators to use the same set of rules to
cover the entire domain. IMHO, this contradicts  the original spirit of
stateless solution and always puzzles me why MAP-E 1:1 bears the MAP-E name.
MAP-E and 1:1 MAP-E are two completely different solutions and target to
different deployment scenarios. I would love to hear others to comment in
the ML how to resolve this issue.

Thanks,
Yiu