ISDN in back up mode.

[tushar47]

Dear all,

I want to install ISDN in back up mode. Now the problem is that the main link is terminated on Fast Ethernet interface.

And I want to know how will the ISDN will sense the link down, as the link in Fast Ethernet is always up.

Please guide me.

Regards,

tushar Garg.

[marinos_g]

Is your FastEthernet interface your main link?

What I can image out of this, is that you have a main link on a modem (DSL perhaps) and the modem is connected to the router with FastEthernet.

Please let me know what scenario you are dealing with

Regards

Marinos

[tushar47]

Dear sir,

The scenario at client end consists of the following.

RF modem, Switch(Non-cisco) RJ45 cable, Router with BRI port and client server. RF link, ISDN line.

So sir tell me the best set up that I can make at client premises.

So sir I want to make a set up at client that as soon as the main RF link is down, the traffic automatically is diverted to ISDN link.

The RF link is over Ethernet based modems.

Tushar Garg,

[marinos_g]

Did you try the link I sent you?

[marinos_g]

Cisco has a new feature called "object tracking"

http://www.cisco.com/en/US/products/sw/iosswrel/ps5413/products_feature_guide09186a00801d862d.html

In that you need to track the object(ip address) on the internet via primary link, if it fails, router will activate backup link..that way the dependency over interface status has been eliminated

[marinos_g]

Hi Tushar,

So, did you make it work or the link I sent you wasn't much of a help for you?

This is how your conf should be:

interface FastEthernet 0/0

description primary_link

ip address 10.1.1.1 255.0.0.0

!

interface Dialer 0

description backup_link

ip address 10.2.2.2 255.0.0.0

!

rtr 1

type echo protocol ipIcmpEcho 172.16.23.7

timeout 1000

frequency 3

threshold 2

!

rtr schedule 1 life forever start-time now

!

track 123 rtr 1 reachability

!

access list 101 permit icmp any host 172.16.23.7 echo

!

route map MY_LOCAL_POLICY permit 10

match ip address 101

set interface dialer 0 null 0

!

ip local policy route-map MY_LOCAL_POLICY

ip route 0.0.0.0 0.0.0.0 10.1.1.242 track 123

ip route 0.0.0.0 0.0.0.0 10.2.2.125 254