Re:[isp-bgp] Route advertisement problem

[mmostafa@nile-online.net]

Dear Craig , 
Unfortunately , there is nothing that will solve ur problem completely , u 
can only  guarantee connectivity to the major part of ur network when 
wireless link # 2 fail via conditional advertisement or advertising AT&T /24 
prefix  from intermediate router to RA via IBGP 
My advise , u should reconsider ur network toplogy providing some redundancy 
i thing itsn't acceptable anyway to be served by 4 diff providers and just a 
single link failure disconnects part of ur network from the internet . 
Regards
Mostafa 
> Craig Baird wrote: 
> > Now here's the dilemma: If Wireless link 1 goes down, things will be fine.  
> > Edge router A will stop announcing 1.1.1.0/24 to AT&T because it will no 
> > longer have a route to any 1.1.1.x networks.  However, in the event that 
> > Wireless link 2 goes down, Edge router A will continue to announce the 
> > 1.1.1.0/24 route to AT&T because it can still see the 1.1.1.0/26 network.  
> > Even though it cannot see 1.1.1.64/26 or 1.1.1.128/25.  So basically, half of 
> > my network will be down if Wireless link 2 dies.  Instead, what I would like 
> > to see is traffic to 1.1.1.64/26 and 1.1.1.128/25 come in via MCI, Qwest or 
> > Sprint, while still having traffic to 1.1.1.0/26 come in through AT&T.  But 
> > the only way I can think of for that to happen would be to announce networks 
> > smaller than /24 to my upstreams (which obviously cannot and would not be 
> > allowed).
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