wan redundancy routing

[network770]

I have 2 sites and 2 wan providers interconnecting the two of them, so far I have all the traffic going over the wan1 and I would like like to dynamically route hte traffic to wan2 in case wan1 goes down.

I tried to create a second route with a higher cost but that doesn't seem to work.

So for example:

                          - 192.168.1.1 ------WAN1-------192.168.1.2 -

  1.1.1.0-->SITE1---                                                           ---SITE2<--2.2.2.0

                          -192.168.2.1 ------WAN2-------192.168.2.2 -

I have setup on site2:

ip route 1.1.1.0 255.255.255.0 192.168.1.1

ip route 1.1.1.0 255.255.255.0 192.168.2.1 100

(note that my default route on site 2 is 192.168.1.1 but that too i want to reroute through wan2 if wan2 goes down)

and on site1:

ip route 2.2.2.0 255.255.255.0 192.168.1.2

ip route 2.2.2.0 255.255.255.0 192.168.2.2 100

but when I remove the primary route on site2 the traffic does not get reouted to wan2

any idea why?

Also, would ip sla be a better option?

what is the easiest and least traffic impacting?

[milan.kulik]

Hi,

what kind of WAN service are you buying from your providers?

It seems like L1/L2 only?

Wouln't be easier to run some dynamic routing protocol between your sites?

BR,

Milan

[network770]

we control the ip schema on both, so it is our layer 3 devices facing the wan.

but how do we reroute traffic to the 2nd wan circuit if the first one fails?

is ipsla the answer?

tried creating another route with a different cost but that didn't work

[David Salazar]

Hi, Ronni.

My opinion is: if you have 2 service provider that represent recurrent cost (mensual), may be is necessary to use both. (This is only a personal opinion)

What bandwidth have every link?

the simple form to have redundancy is:

One primary route's and one secondary route's with worse administrative distance (floating route); with this if the primary route's fail then the second can enter on routing table.

It is so important know the kind of your WAN connection; because if for example its frame relay you need track de DLCI state, but according to the service type you can choose a type of configuration with multiples tools to go to your target.

This link can help you http://www.cisco.com/en/US/docs/ios/12_3/12_3x/12_3xe/feature/guide/dbackupx.html; but I need more information to study the scenario.

I hope it help you

you