[c-nsp] Conditional BGP

[Fawcett Simon]

My choice would be full routing tables from both ISP's, the customer to
change his local pref on the backup link.  if done correctly his own
address space will not be advertised to the backup ISP as it would be
advertised from the the backup ISP to the client.

When the primary link fails the backup BGP link would see  its own
prefix's disappear and start advertising its own prefix's out the backup
link with a 60 sec delay of course.

Thus avoiding problems with private peering arrangements, where
asymetric routing happens.

Good luck have fun

Simon

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of a. rahman
isnaini r.sutan
Sent: 23 September 2008 14:19
To: Paul Stewart
Cc: 'cisco-nsp'
Subject: Re: [c-nsp] Conditional BGP

Hi,


My choice : Inject them a default route & ask them to prepend their
prefixes to you

rgs
a. rahman isnaini rangkayo sutan

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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> 
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