[c-nsp] Conditional BGP

[James Slepicka]

 >>they both wish to use us as a backup provider and wish to ONLY use 
our network if their primary provider (Cogent) is down.

I'm currently doing this with Cogent and another provider.  I get 
default routes from both and simply prepend my AS a few times on the 
backup connection.  In your situation this would mean that all of the 
config is on the customer side.  e.g.:

router bgp xxxx
 ...
 neighbor backup route-map prepend_outbound out
 neighbor x.x.x.x peer-group backup
 ...

route-map prepend_outbound permit 10
 set as-path prepend xxxx xxxx xxxx

James


Paul Stewart wrote:
> Hi folks..
>
>  
>
> We have a couple of customers that are looking to purchase an Internet
> connection from us - this will be a BGP feed to each customer as they are
> multihomed today etc.
>
>  
>
> Normally, we would just supply a full table and let them decide what to do
> with it.  In this scenario, they both wish to use us as a backup provider
> and wish to ONLY use our network if their primary provider (Cogent) is down.
>
>  
>
> What is common practice for this scenario?  We would still prefer to just
> send a full table and put the control into their hands but I'm also
> concerned if they will have the technical expertise to accomplish this..  On
> their side, what would be common practice?  I've been looking at conditional
> BGP advertisements using route-maps but don't believe that's the best
> solution..
>
>  
>
> Thanks for your input.
>
>  
>
> Paul
>
>  
>
>  
>
>  
>
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