We are trying to establish a backup solution using ISDN for an ISP failure at our remote sites. At our remote sites, we currently have several flavors of Netscreen firewalls. According to Juniper, they support failover on the serial interface using ISDN to dial into an ISP. We have set up a Cisco 2600 with a PRI at our main location that will simulate an ISP router. Upon failure of the primary Untrusted connection on the Netscreen, it forces the ISDN TA (MultiTech MTA128NT) to dial the appropriate number and begin PPP negotiations. LCP never completes and the connection gets dropped. I have included the debug ppp negotiations output. Any ideas.
Problem seems with the authentication, you need to chaeck once again username and password on both end router. then give a test call. as per your debug test result every time it is stuck in authentication phase. please remove the earlier username or try to find out the password configured in both side, it should be same on both end.
pls try below one.
On ROUTER A
username ROUTERB password cisco
on ROUTER B
username ROUTERA password cisco
if it helps, otherwise please paste both end config.
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