10-08-2001 10:16 PM - edited 03-01-2019 06:51 PM
Hi ,
I have a 1720 Router which is connected to a 3600 router vial leased line serial . I have also gone in for a ISDN on both the sides so that it can be configured as Backup.
But the backup does not seem to work.
When the serial goes down , the ISDN says ( spoofing ) and does not connnect to the other site at all.
The commands used are
interface serial 0
backup interface serial 1
backup delay 30 60
Dialer is also configured , but then it does not come up and when we ping the other site ... it gives request timed out.
Any suggestions.
Thanx ! in advance.
Tauseef
10-10-2001 09:52 AM
Spoofing is what you want your backup line to be doing while your leased line is down - until traffic of interest is presented to the DDR interface. That is, unless you just want the ISDN up 24X7 when the leased line is down.
You would need to list more of your config to find the problem. Remeber that there are several ways to go about it. The easiest way is to define a dialer-group on your DDR interface and have a matching access-list that defines your traffic of interest.
Don't forget your static routes (of higher cost than your routing protocol)!
10-15-2001 04:04 AM
Hi, in your backup command there is a mistake as your ISDN BRI interface will be the backup interface.
Use the command backup interface BRI0.
You can also configure a dialer hold queu, this will queu the packets while the connection will be setup by ISDN.
If it fails again email me the config so I can help you with it.
Good Luck !!
10-19-2001 10:34 AM
this should help -----
interface BRI1/0 (maybe S0)
description ISDN backup connection to PRIxxxx
bandwidth 1 <---- so not prefered while T1 is up
ip address x.x.x.0 n.n.n.h
encapsulation ppp
no ip route-cache
no ip split-horizon
no ip mroute-cache
no keepalive <--- don't want to run up your phone bill do you?
dialer idle-timeout 900 <--- don't want to run up your phone bill do you?
dialer string 1234567890 <------or dialer map
dialer map ip x.x.x.0 name
dialer load-threshold 1 outbound <-- for getting both channels up
dialer-group 1 <-------( see below)
isdn switch-type basic-ni <-- if internal CSU/DSU
isdn spid1 09876543210000 0987654321 <-- if internal CSU/DSU
isdn spid2 09876543220000 0987654321 <-- if internal CSU/DSU
no fair-queue
no cdp enable <------- don't need extra traffic or polling protocols
ppp authentication chap
ppp multilink
!
dialer-list 1 protocol ip permit <---------defines interesting traffic for group 1
dialer-list 1 protocol ipx permit <---------defines interesting traffic for group 1
set a default static route with a higher admin distance to recieving isdn router IE
ip route 0.0.0.0 0.0.0.0 n.n.n.h 200
link goes down
above route kicks in
ip traffic trigger dialup
==========
link comes up
above route becomes obsolete (router has better route)
timeout kicks in
isdn hangs up
See ya
10-25-2001 10:01 PM
Perhaps there is something wrong with:
1.Define which packets are interesting for dialer
2.Staic route for interesting packet
you can try following configure:
access-list 100 permit ip any any
dialer-list 1 list 100
ip route 0.0.0.0 0.0.0.0 x.x.x.x 1 150
interface dialer x
dialer in-band
dialer-group 1
then in Priv mode,try to ping peer ip address.
10-30-2001 08:26 AM
Hi,
You have the incorrect backup interface configured. Change the backup interface to BRI0 and this should do the trick.
If not, then begin looking into the individual layers. Try issuing the 'show isdn status' command and vreify that Layer1 is active. Layer2 should be established for both B-channels.
Good luck.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide