06-19-2002 12:10 PM - edited 03-01-2019 10:17 PM
I have a 1721 router with a WIC1DSU connected to a T1 for Internet. I would like to install a WIC1ENET in the other WIC slot and connect this to our ADSL providers router and configure that link as a backup for the Internet. I am having trouble locating info on how to configure this.
A collegue mentioned that if the ADSL and T1 are both provided by the same ISP that I can use OSPF. Otherwise I must use BGP, but first be sure that both providers support BGP protocol.
Is this true? Any sample configs or additional info would be appreciated as I've never configured a backup link.
Thanks.
06-20-2002 12:40 PM
Note in this case, if the DSL goes down, the router won't know it - as far as it is concerned, its ethernet connection to the DSL modem is up. If you want the router to detect if the DSL is down, then put a WIC-ADSL in the router.
If you actually want to load balance, i would give BGP a shot. It is actually somewhat difficult to set up with different outside ip addresses on each interface - the routing and mapping issues are pretty nasty.
I just set up a configuration like this, with T1 and DSL on a 2620 router. I used route-maps for the NAT translation as well as policy based routing to direct traffic either over the T1 or the DSL
I can send you a cleaned up config file if that would be useful
06-20-2002 01:01 PM
That would be great and much appreciated!!! echrisman@hufftech.com So i realize the router won't know if the DSL goes down... but could I still configure the DSL connection as a backup rather than load balancing? Thanks.
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