[c-nsp] Selecting an eBGP destination based on the sourcenetwork.

[Ray Burkholder]

> -----Original Message-----
> From: Jim Devane [mailto:jdevane at nevadanap.com] 

> 
> OER is cool, but I am not sure it will do what the poster is 
> looking for. Of course, I just may not be getting it at 
> all.... But it seems to me the fundamental problem ( and one 
> that OER will not solve) is that routing is done by the 
> destination of the packet, not the source. The only way I 
> know to steer packets based on source address is PBR. 
> 
> I hope I am not making a glaring idiot out of myself and if 
> OER can actually route by source, it becomes something I am 
> pretty interested in!
> 


I'm just guessing here with a bit of brainstorming, but perhaps it might
yield something useful.

Perhaps one customer class could be marked and/or placed in one VRF, another
customer class marked and/or placed in another VRF.  An IGP can be used to
cost links and send customer class 1 to one edge router with low-quality
links, and customer class 2 to another edge where high-quality links exists.
The edge routers are BGP meshed.  If BGP on one edge doesn't have the
destinations, then the traffic should then go over to the other link for
exit.

Theoretically, this provides two levels of failover:  
  * the IGP fails from edge to the other
  * the edge routers back each other up (with VRF and appropriate
redistribution, it may even be possible to have high/low quality on the the
same router)

Someone can tell me if I'm on crack or not.



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