Re: Multipath (Re: draft-coene-sctp-multihome-03.txt)

[Randy Bush <randy@psg.com>]

pekke savola, the ops-dir reviewer, thought your comments good.

> seems to me that we need to branch briefly into architecture here.
> 
> in the Internet architecture:
> 
> - an address does not determine a path. The path can change, and will often 
> change in response to failures.
> 
> - the sharing or non-sharing of paths between two destination addresses 
> that "end up in the same place" is unknown and unknowable to the sender for 
> all hops beyond the first hop.
> 
> - nevertheless, sometimes some legs of the path can be different for two 
> destination addresses, and there is presumed to be some set of failures 
> that will affect one path and not the other
> 
> - given that set of failures, and the presumption that it is significant, 
> the approach of SCTP's multiaddress feature makes sense
> 
> - one can do operational things that increases the count of possible 
> failures that affect one path and not the other
> 
> - and that's what this document should say