Regarding source based outbound routing (with redundancy)

Sat Oct 5 18:56:25 UTC 2013

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.lists at gmail.com> wrote:

>On Sat, Oct 5, 2013 at 2:08 PM, joel jaeggli <joelja at bogus.com> wrote:
>>
>> On Oct 5, 2013, at 9:45 AM, Christopher Morrow
>><morrowc.lists at 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 <me at 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
>>>
>>
>