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Dual WAN connection to the same remote office

Posted on 2004-04-16
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Last Modified: 2010-05-18
Here is my set-up:
2 2600 Cisco routers. Both have an available Smart Serial port.
WAN connection via a 56k circuit over X.25 on a 1T WIC w/ separate CSU

We will be upgrading the circuit to T1. Telco has installed the T1 and loop back from CSU to CSU is good.

I was wondering if we could go ahead and add the T1 to an available Smart Serial port on the 2T WIC. On Cisco’s website it looks like it will support that speed. I would like to add the T1 while the 56k is still running so that the planned cut-over goes smooth. Is there any downside of this? Besides setting the Bandwidth to 1544 and Encapsulation to PPP on both routers are there any other settings I need on the routers?
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Question by:RyanSuiso
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PennGwyn earned 125 total points
ID: 10844190
You'll likely want to assign the new ports IP addresses (although for a dedicated point-to-point link like this, you *can* get away with "ip unnumbered").

Then you'll want to adjust your routing so that the routers know to use the new line for traffic.  Static routing is probably what you're already doing, and it's pretty simple:

ip route <dest> <mask> <interface> (for point-to-point interfaces)
ip route <dest> <mask> <next-hop> (for router to select interface based on address, and send to a specific gateway on a subnet)

If you want to use both connections, or to fail over automatically to the 56K if the T1 breaks, then that's a bit trickier.  The easiest thing would be to run EIGRP or OSPF to share route information dynamically instead of statically.  OSPF will prefer the T1, but fail over to the 56K if that's all that's available.  EIGRP will distribute the load based on available bandwidth if you give it a big enough "variance" setting.
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