Hi Tulasi, I think the problem is, there is no standard way to numerically compare IPv4 with IPv6 addresses to form an ordered list. So, all the PEs multihomed to an ES may not always arrive at the same DF (or BFD in the case of single-active L-LINE service) with the default DF election algo. This is problematic (and may cause traffic loops). Hence, the default DF election algo works only when all PEs multihomed to an ES have Originating Router's IP Address of the same AF..
Regards, Muthu On Thu, Feb 4, 2021 at 7:58 PM TULASI RAM REDDY <[email protected]> wrote: > Hi All, > > As mentioned in the Problem Statement of RFC8584 Sec 1.3, Default DF > algorithm is expected to have > all multihomed PEs to have Originating IP of the same address family. > Do we see any interop issue if the different address families are > considered, i.e. ordering in > ascending order based on numerical value in Originating IP here? For IPv4 > read 4 octets as unsigned integer > and IPv6 is considered as 16 octet unsigned integer. > > 1.3 <https://tools.ietf.org/html/rfc8584#section-1.3>. Problem Statement > > Default DF election algorithm assumes > that all the PEs who are multihomed to the same ES (and interested in > the DF election by exchanging EVPN routes) use an Originating > Router's IP address [RFC7432 <https://tools.ietf.org/html/rfc7432>] of the > same family. > > > Thanks, > TULASI RAMI REDDY N > _______________________________________________ > BESS mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/bess >
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