Configuring ISDN Backup connectivity

[net buzz]

Hi!

I have configured Cisco 2811 and 3825 routers to connect the main and remote sites as per the attached topology.

At the main site, the Cisco 3825 router is equipped with SFP ports (HWIC-1GE-SFP with GLC-LH-SM=) for fiber optic connectivity and also has a HWIC-1CE1T1-PRI installed

The Cisco 2811 routers at the remote sites are each equipped with a WIC-1SHDSL-V3 module for SHDSL connectivity and with a WIC-1B-S/T-V3 for backup ISDN connectitivty.

In normal time the routers are using the SHDSL to Fiber optic connectitivty for communication. This has already been configured and is working.

Now, there is a need to implement a backup connection between these sites such that in case the SHDSL or fiber optic connectivity fails, the routers should automatically dial up the backup ISDN connectivity so as to ensure business continuity.

Can you please help about this configuration?

Please see the attached actual routers configurations.

Thanks you,

Alvin

[mavespig]

Hi, do you need help setting up the ISDN link, or you want to implement the backup config?

Regarding the backup mechanism, you basically have three alternatives, you can choose the one the suits you best:

- Floating static routes:

www.cisco.com/en/US/partner/tech/tk801/tk133/technologies_configuration_example09186a0080093f7e

.shtml

- Dialer watch

www.cisco.com/en/US/partner/tech/tk801/tk133/technologies_configuration_example09186a0080094a6c

.shtml

- Backup interface

http://www.cisco.com/en/US/partner/tech/tk801/tk133/technologies_configuration_example09186a008009455d.shtml

You can refer to the following document to choose the right feature for you:

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

Hope this helps

Marco

[net buzz]

Hi Marco!

Actually I needed some help to implement the backup config.

I will check into the links that you have provided.

Thanks,

Alvin

[net buzz]

Dear Marco,

I have configured the main and remote sites routers but I am having an issue about how to make the setup work properly.

Actually  when the primary line goes down (SHDSL/Fiber) the remote site routers  should automatically dial up the backup BRI ISDN connection to connect  to the ISDN PRI line configured on the main router so as to ensure  business continuity.

Please see the attached configs and topology.

Regards,

Alvin