Jeff, > In the presence of a BGP extention that can advertise both paths > rather than just a single best path, the above *might* be a valid > ECMP path. That's still under discussion.
Yes, and about time too. > > > I can think of a scenario when you MUST tell others if you have more > > than one advertisement for a prefix. If a prefix has been learnt from > > two different sources (ASes) AND if you want to distribute the flows > > across these ASes then you *need* to tell othes about these two paths, > > for them to run their loop detection algorithm. > > Exactly. This is one of the reasons why BGP ECMP as practiced today > requires identical AS PATHs. This is a very uninteresting case, i.e., doing ECMP when with exactly the same AS PATHs. The interesting and the more challenging one is when the AS PATHs are similar (same length) but different. > It is also one of the possible uses for > advertising multiple paths inter-domain. Yes. Toms. > -- > Jeff Haas > NextHop Technologies > > > _________________________________________________________________ web user interface: http://darkwing.uoregon.edu/~llynch/grow.html web archive: http://darkwing.uoregon.edu/~llynch/grow/
