[j-nsp] Alternatives to floating static routes?

[Erdem Sener]

Hi,

 Unless you can replace your current switch with another Layer3 device
(c2948-GL3 for instance), it seems a dymanic routing (e.g BGP) seems
to be the only solution, your customer's routers eliminating BFD as an
option.

 If you decide to go with BGP, there are few things I personally think
worth considering such as:

* You'll probably use private-as and your 'peers' are going to
advertise prefixes smaller than /24, with no RIPE route-objects. You
might build your input filter to mark therse small prefixes with
'no-export' community so that any filter of yours having 'from
protocol bgp' statement won't process them. (which would not be a very
good filter anyways)

* For that group, you may decrease bgp timers so that if the link goes
down, you won't have to wait for default BGP timeout for switching
between connections.

 What I'm saying is basically that when configuring BGP, paranoia is
your best friend :)

HTH

On 10/3/06, Dario <dario.donsion at soporte.rediris.es> wrote:
> Dear all,
>
> The customer routers are Cisco 7200 and Cisco 7600, I don't know if they support
> BFD but I don't think so :(
>
> So we need other solutions, BGP or another one.
>
> Regards,
>
>        Dario D.
>
> El Martes, 3 de Octubre de 2006 13:50, George Yalamov escribió:
> > Hi all,
> >
> > What are Customer 1 and 2 routers?  If they are Juniper  will be great,
> > and your can use BFD and static route.
> >
> > As I know cisco series higher than 76xx support BFD but not with static
> > route.
> >
> >
> > Regards
> > George
> >
> >
> > Dario wrote:
> > > Hi all,
> > >
> > > We need to develop a solution to provide redundancy for two of our clientes, connected to us via our
> > > Cisco Catalyst 2950.
> > >
> > > This is the topology:
> > >                                   [FastEth]
> > >     Router Customer 1       ------------- |                   [GigaEth]
> > >                                              |  Cat 2950 --------------- Juniper M40e
> > >     Router Customer 2       ------------- |
> > >                                   [FastEth]
> > >
> > > Right now we have static routes in our Juniper to connect with each customer. The customers have the
> > > posibility to connect their routers. Each one request us to reroute its networks via the other customer when
> > > its link fails.
> > >
> > > We first think in floating static routes, two routes for each customer, the actual one and other via the
> > > other customer with more metric.
> > >
> > > But it'll no work because if for example the link between the Customer 1 and our CAT 2950 fails, our
> > > Juniper see the link with the CAT 2950 up (no possibility to configure keepalives), then the active route
> > > is the static route without metric, it never changes to the floating route.
> > >
> > > BGP (using prepends,...) is a solution but we prefer another one if possible. Any ideas?
> > >
> > > Many thanks and best regards,
> > >
> > >     Dario D.
> > > _______________________________________________
> > > juniper-nsp mailing list juniper-nsp at puck.nether.net
> > > https://puck.nether.net/mailman/listinfo/juniper-nsp
> > >
> > >
> >
> >
> >
>
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-- 
Erdem