I would need to lab it up, but assuming a MPLS core, can't you do a TE tunnel from the source to the desired egress router?
On 10/5/13 2:43 PM, "Christopher Morrow" <morrowc.li...@gmail.com> wrote: >On Sat, Oct 5, 2013 at 2:08 PM, joel jaeggli <joe...@bogus.com> wrote: >> >> On Oct 5, 2013, at 9:45 AM, Christopher Morrow >><morrowc.li...@gmail.com> wrote: >> >>> you really don't want to do policy routing :( >>> >> >> PBR has this tendency to be brittle in the face of topology changes. > >yup, exactly my point :( > >> There are much better way to outbound load-balance between providers >>offering same or similar quality routes to the same destination. >> >> multi-AS multipath will do that if the peers are on the same router. >>BGPaddpath >> can do it for you if the peers are spread across routers. > >these both will require seeing the longer prefix from the right peer >though, right? and selecting that would just be like natural selection >anyway... > >yikes, I suppose you could: > 1) generate the longer prefix internally > 2) set it's next-hop to something reachable out both (all) peers > 3) metric the preferred peer's next-hop appropriately > 4) profit > >but that sounds also kind of messy and prone to odd failures when >changes are made :( >you'd be adding complexity that you'd have to track through the life >of your network :( (and explain to anyone 'not you' working on the >network) > >-chris > >> joel >> >>> On Sat, Oct 5, 2013 at 12:19 PM, Anurag Bhatia <m...@anuragbhatia.com> >>>wrote: >>>> Hello there! >>>> >>>> >>>> I am trying to do a source based outbound routing between multiple >>>> upstreams. Usually I picked outbound via localpref but here I wish to >>>>use >>>> Provider 1 for say 10.10.10.0/24 while provider 2 for small chunk of >>>>it say >>>> 10.10.10.0/28. I wish to keep failover support and thus so if >>>>provider 2 >>>> fails, I wish to push traffic again via Provider 1. >>>> >>>> Is this is possible only with VRF or I can push for some specific >>>>match >>>> rule in route maps? >>>> >>>> >>>> >>>> Thanks. >>>> >>>> -- >>>> >>>> >>>> >>>> Anurag Bhatia >>>> anuragbhatia.com >>>> >>>> Linkedin <http://in.linkedin.com/in/anuragbhatia21> | >>>> Twitter<https://twitter.com/anurag_bhatia> >>>> Skype: anuragbhatia.com >>> >> >
