Hi John, Jeff, FYI - latest revision of this draft corrects the BW attribute to be transitive inline with Ali's explanation below: https://www.ietf.org/archive/id/draft-ietf-bess-evpn-unequal-lb-07.txt. Please do let us know if there are any further concerns.
4.2. EVPN Link Bandwidth Extended Community A new EVPN Link Bandwidth extended community is defined to signal local ES link bandwidth to remote PEs. This extended-community is defined of type 0x06 (EVPN). IANA is requested to assign a sub-type value of 0x10 for the EVPN Link bandwidth extended community, of type 0x06 (EVPN). EVPN Link Bandwidth extended community is defined as transitive. Link bandwidth extended community described in [BGP-LINK-BW] for layer 3 VPNs was considered for re-use here. This Link bandwidth extended community is however defined in [BGP-LINK-BW] as optional non-transitive. Since it is not possible to change deployed behavior of extended-community defined in [BGP-LINK-BW], it was decided to define a new one. In inter-AS scenarios, link-bandwidth needs to be signaled to eBGP neighbors. When signaled across AS boundary, this attribute can be used to achieve optimal load-balancing towards source PEs from a different AS. This is applicable both when next- hop is changed or unchanged across AS boundaries. Thanks, Neeraj On Thu, Jul 30, 2020 at 11:14 PM Ali Sajassi (sajassi) <sajassi= [email protected]> wrote: > John, Jeff: > > > > During the presentation of draft-ietf-bess-evpn-unequal-lb -03 at the BESS > WG meeting, you had a question/concern regarding why we are defining a new > EC if we are doing conditional transitive. First, I’d like to make a > correction to the preso by saying that the transitivity is not conditional > and we will correct this in the next rev of the draft. So, the EC is simply > transitive at all time. Given the EC defined in > draft-ietf-idr-link-bandwidth-07.txt is non-transitive, we cannot use this > EC for our application. That’s why we are defining a new one. > > > > Cheers, > > Ali > > > _______________________________________________ > BESS mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/bess >
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