[c-nsp] Best Routing Protocol for Scenario

[Kristian Larsson]

There is something called multi-topology routing
which might suite your needs. Basically you build
different topologies for different subnets and
that would allow you to have lower cost over the
T1 for your voice nets and vice versa for the
data. This might or might not work depending on
what traffic you need to match as this is based
purely on IP adresses and not on some uppwer layer
protocol.

(And no, haven't looked at your visio drawing, so
I might be going on a limb here.).
 ;)

 Regards,
   Kristian.


On Thu, May 31, 2007 at 01:11:38PM -0400, Paul Stewart wrote:
> Hi folks...
> 
> A while back (month or so) I posed a few questions about Policy Based
> Routing - thinking that was best way to conquer a new challenge... now I'm
> not so sure so looking for input.
> 
> Here's the layout and what I want to accomplish....
> 
> Customer premise has a Cisco 3662 router.  From the 3662 we have 2 TI's
> leaving and 2 Ethernet connections leaving towards a 6509 back in our data
> center.  The 2 T1's go to a remote POP where they terminate on a Cisco 3640
> router.  The Cisco 3640 router connects to a Cisco 7206VXR which in turn
> connects via TLS back to the same 6509 in our data center.  The ethernet
> connections leaving the customer site from the Cisco 3662 connect directly
> back to the 6509 with speeds of 6 Mb/s X 800Kb/s each.  The T1's are full
> 1.544 Mb/s.
> 
> So, one router at customer premise that needs to connect back to one router
> in our data center using 4 paths.  The pair of T1's and the pair of ethernet
> ports should be "bonded" or load balanced.  Traditionally this has been done
> via OSPF/CEF on our side of things.
> 
> We want all VOIP traffic passing between the customer site and our data
> center to travel via the T1 circuits and all Internet traffic to go via the
> ethernet connections.
> 
> I'm looking for the best routing protocol in this scenario that will allow
> me to use route-maps (or other alternatives) to identify source IP and
> destination IP subnets and apply priority.  At the same time if the "far
> end" of each connection is unavailable then I want the traffic to "fallover"
> to the other connections as a backup automatically.
> 
> I had though at one point that OSPF would be ideal but I'm not aware of a
> way to apply a route-map to OSPF specifying only certain traffic prefers a
> certain path.  We do this all the time with BGP so I though maybe iBGP could
> be applied here but I have the feeling that there is a better solution....
> 
> Open to ideas and appreciate it...
> 
> Paul
> 
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-- 
Kristian Larsson                                   KLL-RIPE
Network Engineer                       SpriteLink [AS39525]
+46 704 910401			     kristian at spritelink.se