Setting up ISDN and ADSL on same router for resilience
Am struggling to provide redundancy between an ADSL and an ISDN lin I am setting up for one of my clients. The scenario is that I have a Cisco 2811 router with ISDN and ADSL links on Site A. These connect to another Cisco router with ISDN (p2p) on site B and another router with ADSL terminated on site C. I have connectivity up and running between sites A and site C using ADSL. I am trying to setup the network such that if I lose connectivity via the ADSL (primary), I would like the ISDN (backup) to take over. However, I am still not able to get the traffic to go via the ISDN connection (site A to B).
I configured NAT outside on dialer interface on router on site A. Am not too sure if it is permissible to configured another NAT outside on the BRI interface of router on site A.
Can anyone advise how I can get traffic to go through the ISDN connection if I lose the ADSl link. Can I configure multiple NAT outside commands on the router on site A?
Find below sample config of the setup on the 3 routers.
ip add 10.94.81.1 255.255.255.55
ip add 10.247.x.x 255.255.255.0
ip nat inside
(usual config for ADSL)
ip add 10.94.82.1 255.25.255.0
(usual config for ISDN)
ip add negotiated
ip access-group WORD in
ip nat outside
ip nat pool TRAFFIC 10.94.81.129 10.94.81.254 prefix-length 25
ip nat inside source list ABA_NAT pool TRAFFIC overload
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