[c-nsp] 2MBit leased line and dsl backup

[Kristofer Sigurdsson]

Florian Taeger, Wed, Mar 16, 2005 at 10:44:25AM +0100 :
> Hi,
> 
> Both lines go to the same isp (me :)
> 
> So i might do ospf over this two lines, but I want to avoide it as far as
> possible. I don't like to speek a routing protocol to a router owned by a
> customer - I don't like to think of what they might do with the ospf 
> digest ...

OSPF is not a very good idea, as it's not designed around including untrusted
routers.  However, you might want to consider using a different OSPF process,
different areas, expirament with stubby areas, perhaps?

Also, you could try another routing protocol.  BGP immediately comes to mind,
as that's designed for this kind of stuff (just use private AS's if your customer
doesn't have a real one).  If the CE equipment won't do BGP, RIPv2 might be
enough.  If you're using RIP you can control exactly which subnets you accept
advertisements for on which interfaces using "distribute-list <acl> (in|out) [interface]",
or something like that...

Then you can use a route-map or whatever to redistribute your client's BGP/RIPv2 
advertisements into your usual internal routing protocol.

-- 
Kristófer Sigurðsson         | Tel: +354 525 4103 / MSN: ks at rhi.hi.is
Netsérfr./Network specialist | Reiknistofnun HÍ/University of Iceland