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isdn backup and static routing

I have two routers linked via a 56k circuit. I have installed ISDN as a backup line and can successfully make manual calls to the remote end. However I can't seem to route traffic over the ISDN line. The serial (56k) is not running unnumbered and is network 192.168.121.0 255.255.255.0 The near end has a static route for this 192.168.121.0 network pointing to the remote ends serial ports IP address (192.168.121.2). On the remote end, no ethernet ports are enabled as I connect to an x25 network via a serial port. So TCP to X25 translation is taking place on this remote router.

I have tried using a floating static route with no success. Would the remote end having no active ethernet port be a issue? If so I was thinking about creating a loopback interface on that end and using the command "ip unnumbered loopback1" for the BRI0/0 port.

What else can I try on this scenario?

  • Other Network Infrastructure Subjects
1 REPLY
Anonymous
N/A

Re: isdn backup and static routing

You don't need an ethernet port to get

this to work. Without seeing your

entire config, it's difficult to comment,

but in general something like this

should work:

int ser 0

ip addr 10.1.1.1 255.255.255.0

!

int br 0

ip addre 10.1.2.1 255.255.255.0

encap ppp

ppp authen chap

dialer-group 1

dialer map ip 10.1.2.2 name remote 123456

ppp mult

!

ip route 0.0.0.0 0.0.0.0 10.1.2.2 200

! OR

ip route 10.1.3.0 255.255.255.0 10.1.2.2 200

! where 10.1.3.0 is a reachable network

! address at the remote, used for translation

!

dialer-list 1 prot ip permit

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