[c-nsp] Conditional BGP

[Stephen Kratzer]

On Tuesday 23 September 2008 08:37:56 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

Paul,

Most providers offer three options: full routes, partial (customer) routes, 
and default route only. Allowing the customer to select from these options 
allows them to choose the option that they can best support. To implement 
these options, you can create as-path access list and prefix list templates 
and apply them outbound as needed.

Stephen Kratzer
Network Engineer
CTI Networks, Inc.