Re: OSPF vs IS-IS vs PrivateAS eBGP

[Andy Davidson <andy () nosignal org>]

On 19 Aug 2009, at 16:12, Clue Store wrote:
> I would like to run an IGP (currently OSPF) to our customers that  
> are multi-homed in a non-mpls environment. They are multi-homed with  
> small prefixes that are swipped from my ARIN allocations.
[...]

Customers do, err, interesting and creative things, in unexpected  
ways.  Develop a standard filtering/protection layer from them and  
deploy it however they connect to you - ergo use one routing protocol.

Using bgp means you can transit people who aren't pinching your own  
arin space with the same filtering techniques.  The filtering methods  
and techniques for customer/provider edges are well understood and  
documented for bgp so if you need help, then help is out there.  With  
bgp you'd also leave less of a time bomb for whoever succeed you in  
the future.  This is before we even look at the technical reasons why  
bgp is more suitable than a flooding RP for this deployment.

Use BGP ;-)

A