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Cisco 1841 Router with HWIC 3G CDMA card

Posted on 2010-08-24
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Last Modified: 2013-12-09
I have a Cisco 1841 configured with serial WAN card and a HWIC 3G CDMA card.

Attachement one shows how we were operating.  The T1 line was down and the HWIC ran as a "fail-over".  Life was good.  You will notice that we had the ip route as "0.0.0.0 0.0.0.0 Cellular0/1/0.

Once the T1 line came back up - we were shut down.  Nothing in or out.  We changed the the ip route to "0.0.0.0 0.0.0.0 Serial0/0/0" (see attachement two).  We are up and running.

My concern, the HWIC is supposed to be a fail-over if the T1 goes down so my end-users can still get on the internet.  As it sits now, if the T1 goes down, the card will kick in, but since the ip route is set to the Serial, no internet - I'm stuck.

Any help would be appreciated.

Config-1.txt Config-2.txt
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Question by:IGHQIT
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7 Comments
 
LVL 24

Expert Comment

by:rfc1180
ID: 33516892
>Attachement one shows how we were operating.  The T1 line was down and the HWIC ran as a "fail-over".  Life was good.  You will notice that we had the ip route as "0.0.0.0 0.0.0.0 Cellular0/1/0.
Once the T1 line came back up - we were shut down.  Nothing in or out.  We changed the the ip route to "0.0.0.0 0.0.0.0 Serial0/0/0" (see attachement two).  We are up and running.

Correct, this is the expected behavior without some type of policy based routing using some form of SLA monitoring to track when an interface goes down and comes back up.

Frankly, I am not sure how your configuration is working with the static route out via the T1 as your fast0/0 has a private IP address and nat inside with a public address on the T1, so that right there does not make much sense to me.

I believe what you are looking for is automatic failover and recovery of links?

Billy


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Author Comment

by:IGHQIT
ID: 33516906
Network topography ---
Me = 10.1.1.X
Store 1 = 10.1.2.X
Store 2 =.....
Store 6 = 10.1.7.X
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Author Comment

by:IGHQIT
ID: 33516939
Sorry - Fat fingered that...

All stores come back to me through the MPLS to my router.  From me they receive their access to the internet and phones.

Yes - looking for automatic fail-over for each node below me.  The router is placed at the location with the HWIC.  If the MPLS leg to the "store" goes down, I would like the HWIC to kick in and they obtain internet access through DHCP from Verizon.  Since we utilize terminal services for  production applications, I'm just concerned that they can stil get out - connecting to my network is secondary.  The T1 will come back online at sometime.  At which point, I would like for HWIC to "drop off" and we are back to "me" handing out internet access.

The network has worked fine up until this point as the config shows.  The HWIC is a new addition to keep my "stores" working.

Does that make sense?
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LVL 24

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by:
rfc1180 earned 500 total points
ID: 33517157
>Does that make sense?

it does now:

Try this:

backup your config

enable
conf t

no ip nat inside source list 100 interface Cellular0/1/0 overload
no ip route 0.0.0.0 0.0.0.0 Serial0/0/0
no ip route 0.0.0.0 0.0.0.0 Cellular0/1/0

ip sla 1
 icmp-echco 198.18.33.229 source-interface Serial0/0/0
 timeout 1000
 frequency 2
ip sla schedule 1 life forever start-time now

track 1 rtr 1 reachability
 delay down 15 up 10


ip nat inside source route-map cdma interface Cellular0/1/0 overload

ip route 0.0.0.0 0.0.0.0 Serial0/0/0 track 1
ip route 0.0.0.0 0.0.0.0 Cellular0/1/0  254
!
route-map cdma permit 10
  match ip address 100
  match interface Cellular0/1/0
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Expert Comment

by:rfc1180
ID: 33517160
take note, that 198.18.33.229 will be different for each store (you will want to replace 198.18.33.229 with the next hop address for the T1)

Billy
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Author Comment

by:IGHQIT
ID: 33560807
Billy,

Thanks for the input.  I haven't been able to completely test yet.

From config t, whenever i enter...

ip sla schedule 1 life forever start-time now

track 1 rtr 1 reachability
 delay down 15 up 10


Router comes back with invalid character...

Thoughts?

Randall
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LVL 24

Expert Comment

by:rfc1180
ID: 33562194
You probably need an IOS that supports IP SLA

Billy
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