Robert Here are a few examples of UCMP drafts below used in core and data center use cases.
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-unequal-lb-15 https://datatracker.ietf.org/doc/html/draft-mohanty-bess-weighted-hrw-02 https://datatracker.ietf.org/doc/html/draft-ietf-idr-link-bandwidth https://datatracker.ietf.org/doc/html/draft-mohanty-bess-ebgp-dmz There are many use cases in routing for unequal cost load balancing capabilities. Kind Regards Gyan On Wed, Jan 12, 2022 at 2:23 PM Robert Raszuk <[email protected]> wrote: > Linda, > > > IGP has been used for the Multi-path computation for a long time > > IGP can and does ECMP well. Moreover, injecting metric of anycast server > destination plays no role in it as all paths would inherit that external to > the IGP cost. > > Unequal cost load balancing or intelligent traffic spread has always been > done at the application layer *for example MPLS* > > Thx a lot, > R. > > On Wed, Jan 12, 2022 at 8:18 PM Linda Dunbar <[email protected]> > wrote: > >> Robert, >> >> >> >> Please see inline in green: >> >> >> >> *From:* Robert Raszuk <[email protected]> >> *Sent:* Wednesday, January 12, 2022 1:00 PM >> *To:* Linda Dunbar <[email protected]> >> *Cc:* Les Ginsberg (ginsberg) <[email protected]>; [email protected] >> *Subject:* Re: [Lsr] Seeking feedback to the revised >> draft-dunbar-lsr-5g-edge-compute >> >> >> >> Hi Linda, >> >> >> >> *[LES:] It is my opinion that what you propose will not achieve your >> goals – in part because IGPs only influence forwarding on a per packet >> basis – not a per flow/connection basis.* >> >> *[Linda] Most vendors do support flow based ECMP, with Shortest Path >> computed by attributes advertised by IGP.* >> >> >> >> I am with Les here. ECMP has nothing to do with his point. >> >> >> >> [Linda] Les said that “IGP only influence forwarding on a per packet >> basis”. I am saying that vendors supporting “forwarding per flow” with >> equal cost computed by IGP implies that forwarding on modern routers are >> no longer purely per packet basis. >> >> >> >> >> >> Draft says: >> >> >> >> *When those multiple server instances share one IP address (ANYCAST), the >> transient network and load conditions can be incorporated in selecting an >> optimal path among server instances for UEs.* >> >> >> >> So if we apply any new metric to indicate load of a single anycast >> address how is this going to help anything ? >> >> >> >> [Linda] The “Load” or “Aggregated Site Cost” is to differentiate multiple >> paths with the same routing distance. >> >> >> >> >> >> You would need a mechanism where the network is smart and say per src-dst >> tuple or more spreads the traffic. IGP does not play that game today I am >> afraid. >> >> [Linda] There is one SRC and multiple paths to one DST. IGP has been used >> for the Multi-path computation for a long time. >> >> >> >> Thank you, Linda >> >> >> >> Thx a lot, >> R. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> > _______________________________________________ > Lsr mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/lsr > -- <http://www.verizon.com/> *Gyan Mishra* *Network Solutions A**rchitect * *Email [email protected] <[email protected]>* *M 301 502-1347*
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