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Webcast-Catalyst9k
New Member

Seemless failover from wirless to ip_dsl vice versa

Hello Expert,

I have a hub and spoke environment.

I have two connections from hub to spoke via (1) ip dsl and (2) wireless

I am trying to simulate a seemless failover if either the ip_dsl link or the

wireless link fail.

Between the the hub and spoke I am using a vpn tunnel configure using

Dmvpn. ( see  hub configuration as per attactment)

When both ip dsl and wireless link is up I able to ping all interface

from the hub or vice versa spoke.

It should be mention I am using the ip dsl(interface GigabitEthernet0/1)

as my primary link.

When I simulate a drop on my ip dsl link and try pinging the respective

Interfaces no connection.

If I reconnect the ip dsl link and drop the wireless link I can ping all

Interface.

     

I suspect a route is missing from the configuration can anyone assist.

Regards

Jomo

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Blue

Re: Seemless failover from wirless to ip_dsl vice versa

rbglusers wrote:

hello Jon,

>> ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250

the above will be add to the hub.

.

what about the spoke  should any  routes be added?

It should be mention on the spoke i have a static route ( see below)

ip route 0.0.0.0 0.0.0.0 tunnel0

Is the above route neccessary to ensure  all packets use the tunnel?

Regards

Edit - actually just reread original post and it's more complicated than i thought.

If you are using DMVPN then if you want to switch between the 2 links you will need to use dynamic routing and not static routing. If you used something like EIGRP you could exchange routes down the DSL tunnel and then if the DSL conenction was lost at either end you could have a floating static pointing to the wireless link.

So basically you need to -

1) turn on EIGRP on your routers

2) exchange EIGRP routes via the DSL link

3) on hub and spoke add a floating static, as provided before, pointing to the wireless link

Jon

4 REPLIES
Hall of Fame Super Blue

Re: Seemless failover from wirless to ip_dsl vice versa

Jomo

Try adding this to your config -

ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250

this is a floating static and will only be used if your DSl interface drops. If the DSL interface comes back up then it shouldbe removed and the original default-route used again.

Jon

New Member

Re: Seemless failover from wirless to ip_dsl vice versa

hello Jon,

>> ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250

the above will be add to the hub.

.

what about the spoke  should any  routes be added?

It should be mention on the spoke i have a static route ( see below)

ip route 0.0.0.0 0.0.0.0 tunnel0

Is the above route neccessary to ensure  all packets use the tunnel?

Regards

Hall of Fame Super Blue

Re: Seemless failover from wirless to ip_dsl vice versa

rbglusers wrote:

hello Jon,

>> ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250

the above will be add to the hub.

.

what about the spoke  should any  routes be added?

It should be mention on the spoke i have a static route ( see below)

ip route 0.0.0.0 0.0.0.0 tunnel0

Is the above route neccessary to ensure  all packets use the tunnel?

Regards

Edit - actually just reread original post and it's more complicated than i thought.

If you are using DMVPN then if you want to switch between the 2 links you will need to use dynamic routing and not static routing. If you used something like EIGRP you could exchange routes down the DSL tunnel and then if the DSL conenction was lost at either end you could have a floating static pointing to the wireless link.

So basically you need to -

1) turn on EIGRP on your routers

2) exchange EIGRP routes via the DSL link

3) on hub and spoke add a floating static, as provided before, pointing to the wireless link

Jon

New Member

Re: Seemless failover from wirless to ip_dsl vice versa

Hello Jon,

Sorry for the late response holiday in my country.

I implemented the three steps as outlined in your post and the failover from dsl to

wireless worked.

I even configure and add three more spokes. And the failover work seemless.

I need clarification before I decide to drop this new configuration into production.

Currently in production I have a similar topology but I am only using dsl link

No wireless link.

On all of my spokes I have a default route ip route 0.0.0.0 0.0.0.0 tunnel0

which ensures that all traffic forward to the hub pass thru the tunnel

eigrp is also enabled on all routers both hub and spokes.

I am a bit confuse and need clarification—I notice that for the testing

I am only adding

>> ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250 hence the resp spoke and hub routes will be

spoke

ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/1

ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250

Hub

ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0 250

Will the traffic from hub to spoke vice versa be encrypted since none of the default routes points to a tunnel ?

Regards

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