From: Victor Cappuccio (vcappuccio@gmail.com)
Date: Wed Sep 17 2008 - 17:29:46 ART
Amin,
Besides the Ideas of Shaughn, and if I understand clearly your question, you
just need to have a routing protocol like EIGRP, or (OSPF|ISIS), to have in
their topology table a backup route (or a feasible successor) to each of
this sites routes if those routers are the PEs.
Now, for the configuration of the WIC-1T and the main link, you can
probably enable PPP, and take advantage of the quality feature, and other
features of this protocol, also you can probably use routing protocol
features like OSPF Fast Hellos
http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fasthelo.html
Continuing with the idea that those routers are just PE Routers,
Frame-Mode (per platform label space) MPLS LDP Neighbours maintain the
neighbour relationship using the LDP (or TDP) Router Identifier, (if the TLV
was not modified), and that interface should be reliable interface (like
loopback), so this LDP would have a relationship via it peer using a TCP
(646) http://www.faqs.org/rfcs/rfc3036.html, maintaining a per platform
label space allocation
RFC 3031
When these conditions hold, an LSR may use labels that have "per
interface" scope, i.e., which are only unique per interface. We may
say that the LSR is using a "per-interface label space". When these
conditions do not hold, the labels must be unique over the LSR which
has assigned them, and we may say that the LSR is using a "per-
platform label space."
Note here, that in per-platform label space only one label is assigned to a
destination network and announce to all neighbours, the label is unique and
valid.
So no matter what link the MPLS frame is traveling it would have the same
label carried in the frame as like the main link is up, in the packet
assigned by the neighbors LIB
Now if you are talking about a connection with CE via a backdoor link, then
I can probably recommend you to call your ISP to see if they can configure a
Sham Links if running you are running OSPF there, and try to adjust
(assuming that you prefer the traffic going to the ISP) the cost of those
backup routes. (again just a routing protocol having the route in the
topology table as stated before).
Just my 2 cents
Victor.-
On Wed, Sep 17, 2008 at 9:29 PM, Shaughn Smith <
Shaughn.Smith@za.verizonbusiness.com> wrote:
> This is possible but you would need access to the Provider routers or
> ask them to do the configs.
>
> The more advanced way of doing this is to run HSRP between the two
> routers so the lan machines always have one "gateway ip" (virtual ip for
> HSRP)
>
> I would then run some sort of routing protocol between the 2 CPE's with
> floating statics so they are aware if one or the other's link goes down.
>
>
> You can also do this on the CPE by tracking an interface with HSRP/VRRP
>
> This is a very brief explanation but it's the way I would do it.
> Obviously it gets more complex if your are peering with the provider via
> BGP etc
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie
> Sent: Wednesday, September 17, 2008 8:59 PM
> To: ccielab@groupstudy.com
> Subject: Back up an MPLS VPN with another two router connected through
> leased line link
>
> Hi Experts.
>
> I have two site A and B, each with 878 router to provide MPL VPN I have
> no
> access one these two router. I want to implement a leased line back up
> for
> this VPN link. I installed 1841 with WIC-1T in each of these two site.
> How I
> could configured my two router with their TDM link to be an automated
> backup
> for the provider router?
>
> Regards,
>
> Amin
>
>
> Blogs and organic groups at http://www.ccie.net
>
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