You could set the local preference to be higher on the routes comming in via
the prefered provider and prepend your own AS onto the aggrigate route you
send out to the non-prefered provider.

For the one /24 that you want  to go in/out via the backup provider you
could use a route-map to "source-route" to the backup provider and prepend
your AS onto that specific route going to the "main" provider while at the
same time announcing it without the prepend to the "backup"provider.

I think you may have problems announcing a route for a network as specific
as a /24 as many providers will not propogate this via BGP.

Anthony Pace


""Kim Seng""  wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> My network has an Internet Border router. The router
> has two ISPs connection: UUNET(T3) and SPRINT(T1). We
> have a supernet class B: 18x.18x.0.0/16. Can I
> configure the router so that only one of the class C
> subnet of this supernet for example 18x.18x.1.0/24 to
> use the SPRINT link for both inbound and outbound
> traffic. The rest of the supernet will use the UUNET
> link. But they need to backup each other when one of
> them fails.
>
> Thanks in advance.
>
> Kim.
>
> __________________________________________________
> Do You Yahoo!?
> Yahoo! Tax Center - online filing with TurboTax
> http://taxes.yahoo.com/




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