To do what you are describing you will need to use BGP4. What you described
is what we call multi-homing.
The two ISP's will have different Autonomous System Numbers and you will
need to advertise you routes to each with BGP4.
Of course with anything in networking there is more than one way to solve
the problem. One solution would be to subnet your users based on say
application. The address space for subnet #1 will be advertised to ISP #1
with a primary local preference (ask the ISP their policy on local pref),
likewise the address space for subnet #2 will be advertised to the same ISP
#1 with a "lower" local pref. Moreover, the address space for subnet #2
will be advertised to ISP #2 with primary local preference and subnet #1
with a lower local pref.
This way if one link should fail, the operational link will pick up all the
traffic when re-convergence completes.
Regarding ISP owned IP addresses - you will have to work that out with the
respective ISPs.
cwgator
----- Original Message -----
From: "Atul Kumar Udupi"
To:
Sent: Saturday, March 03, 2001 1:38 AM
Subject: Re: 2 ISP's terminate on Same ROUTER [1:2290]
> Dear Paulo,
> See this i have thought of and works in normal condition. In case any
ISP
> goes down what will happen ?
> In my network there are hosts having valid ip addresses belonging to both
> ISP's . My problem is when any one ISP goes down how will the ROUTING with
> respect to downed ISP takes place ? how to achieve this..... ?
>
>
> Thanks
> Atul
>
>
>
> Paulo Roque wrote in message
> news:200103021503.KAA18327@xxxxxxxxxxxxxxxxx
> > You can use static routes with different administrative distance. Link
> this:
> >
> > ip route UPLOAD MASK X1
> > ip route UPLOAD MASK X2 10
> >
> > ip route 0.0.0.0 0.0.0.0 X2
> > ip route 0.0.0.0 0.0.0.0 X1 10
> >
> > where
> > UPLOAD MASK is the destination address for upload traffic
> > X1 is the IPS x1 address
> > X2 is the IPS x2 address
> >
> >
> > Paulo Roque
> >
> >
> >
> >
> >
> > "Atul Kumar Udupi" escreveu na mensagem
> > news:200103021043.FAA19771@xxxxxxxxxxxxxxxxx
> > > Greetings,
> > > Hello all,
> > > I would like to know whether its possible to terminate internet
> link
> > > from 2 ISP's on a same cisco router.
> > > I will give more input. Assume that x1 and x2 are 2 isp's to
> which
> > i
> > > want to connect. I will be using one perticular link for browsing
> and
> > > another i want to use it only for uploading some application to
another
> > > network located some other place. This i am able to do it by simple
> static
> > > routes. But my problem is if one isp link fails i want to route all
the
> > data
> > > as usual.
> > > anyone can help ?
> > >
> > > Thanks in advance. If u need more input please ask me.
> > >
> > >
> > >
> > > Atul
> > >
> > >
> > >
> > >
> > > Message Posted at:
> > > http://www.groupstudy.com/form/read.php?f=1&i=2290&t=2290
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> >
> >
> >
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