Configuration of ADSL backup to T1

[rrevuru]

Hello:

I have T-1 from SBC coming to Serial 0/0 of 2611XM. I have the ADSL from speakeasy to FastEthernet 0/1 of 2611XM.
I wanted to use ADSL as a backup connection to T-1,i mean in case we T-1 goes down,ADSL should be up and running.

This is what i did, i added the following command at serial interface mode

Serial0/0#backup interface fa0/1

Also i added ip address given by Speakeasy to fa0/1
FastEthernet0/1#ip address x.x.x.x 255.255.255.0


When i did the command "sh ip int brief". this is what it shows


FastEthernet0/0 192.168.2.1 YES manual up up

Serial0/0 x.x.x.x YES manual up up

FastEthernet0/1 x.x.x.x YES manual standby mode down


When i manually shut down Serial0/0.. i was hoping the Fa0/1 should come up and provide seamless internet connection. But it is not. Please let me know any changes i need to make.

 

[webnetwiz]

hmmm, you don't need the backup command on the serial because your're not using dialer profiles. You could set up a route map to send traffic to the FastE interface when the primary is down, or you could set up a floating static route, for example, you probably have something like:

ip route 0.0.0.0 0.0.0.0 Serial0/0 (default route out of the T1)

You could add the following:

ip route 0.0.0.0 0.0.0.0 FastEthernet0/1 254 (the 254 makes this route less desirable then the primary, but if the primary is down, taffic will flow out of the FastE interface).

Hope this helps.

 

[limejudo]

Do you need to have an adsl wic? Also are you using and external dsl modem provide by the isp?

wiz is correct about the floating routes also.

do a show int f0/1
if you have input packets your communicating with the isp, if you have output packets your sending a signal out. If you dont have any input packet check the settings w/ isp.

Make sure the vpi/vci setting are correct 0/35 or 8/35 get this from the isp. Check to see if they are using pppoe or pppoa. some isp will want username and password, chap or pap.
Let me know what happens..

Eric - A+, Net+, INet+ CCNA next week.
Network Admin/Helpdesk II

http://www.usunwired.com