Cisco ADSL with ISDN backup 1

[HV007]

Hi
Can anyone help me with a adsl with isdn problem. I am trying to set up a 1721 router with an adsl wic and an isdn wic. So i want to do isdn backup if the adsl line goes down. This is a vpn setup to a concentrator. So i cant use gre to tunnell and no routing protocol I think.
Will the backup cmd work with adsl VC's?. Any ideas?

Regards
HV007

 

[KiscoKid]

There are a number of ways of configuring this solution. The 1st link below explains 3 of the more traditional ways using floating static routes, dialer watch and backup interface. Which on you use depends on your environment and/or ability level.

http://www.cisco.com/en/US/tech/tk801/tk133/technologies_tech_note09186a008009457d.shtml

However since IOS 12.3, you can use enhanced object tracking and reliable static routing. I[ve been predominantly using this on a lot of ISDN backup solutions I've been configuring recently. Here's a link to URL on Cisco that explains how this works and more importantly how to configure it.

http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/products_feature_guide09186a00801d862d.html

HTH

 

[HV007]

Hi

I have configured the adsl with isdn backup but when I add the default (ip route ............. dialer 1) the track goes down and does not kick over to the isdn, but when I ad the next hop router/forwarinf routers ip it works!!!!!
I cant add the next hop ip cause it keeps on changeing. We are with BT business adsl. How can I get around this.

Regards
HV007

 

[rtfmdude]

hv007,

routing out the dialer interface will fail if you're using a legacy dialer(dialer rotary-group) & dialer map. If you configure a dialer profile(dialer pool-member/dialer pool) then you can route using the interface.

Post your config and run a debug dialer & debug dialer packet if that doesn't work for whatever reason.

 

[HV007]

Hi
Thanks for the advice.
I am useing dialer pools on my adsl atm0 and dialer 1 interface and dialer-group on my bri0 interface. From what I understand of "Reliable Static Routing Backup Using Object Tracking" you either need to specify a next hop or as there example have the default route pointing to the forwaring routers address. ANY IDEA'S!!! I wil change the bti to a dialer and if that does not work I will post my config.

Thanks again.
Regards
HV007

 

[rtfmdude]

Ah - don't worry about making the changes - I didn't realize that you were pointing your SAA object to the next hop over the DSL. Just ping something else that's fairly reliable, like a core router in your provider's network.

 

[HV007]

Hi

I spoke to bt and they said I have to order 5 ip and not just 1. Then they can give me a static gateway, so this will solve the problem. From my test it looked like I had to specify a next hop route.

Thanks all for the help.

Regards
HV007