Backup on Demand ISDN

[JH24]

I have a Cisco3660 which connects all the remote offices to the main office with a Primary Kilostream to each office. If this goes down then at the moment ISDN backup cuts in if the kilostream link goes down.

What i want to be able to set up is to make the ISDN only come up if their is Interesting Traffic on the remote office end (Thin Client is used so the request would always be from the remote office)then i want the ISDN to come up.

I dont want this to effect the primary link at all though and when the link comes backup i then want the Dialer to go back in a standby state so that no ISDN can come up as it does at the moment.

Any ideas??
Thanks
James

 

[jevansau99]

try something like this ..... - not this is a PRI ISDN line ....

interface Serial2/0.1 point-to-point
bandwidth 256
backup delay 5 0 (this waits for 5 secs before killing isdn)
backup interface Dialer1
ip address xx.xx.xx.xx 255.255.255.252
ip ospf message-digest-key 1 md5 7 ourospfpresharekey
frame-relay class thelimit
frame-relay interface-dlci 20 IETF

interface Group-Async1
ip unnumbered Loopback0
encapsulation ppp
ip tcp header-compression
no logging event link-status
async dynamic routing
async mode dedicated
peer default ip address pool Dial-In-Pool
ppp authentication pap
group-range 97 124
!
interface Async125
ip address negotiated
encapsulation ppp
no logging event link-status
dialer in-band
dialer hold-queue 50
dialer-group 1
async default routing
async mode interactive
no fair-queue
ppp authentication pap
!

!
interface Dialer1
ip address negotiated
encapsulation ppp
ip ospf demand-circuit
dialer in-band
dialer idle-timeout 300
dialer string 08819864
dialer string 08819863
dialer hold-queue 50
dialer load-threshold 20 either
dialer-group 1
no fair-queue
no cdp enable
ppp authentication pap callin
ppp pap sent-username user password 7 userpass
ppp multilink bap

dialer-list 1 protocol ip permit (this statement makes IP traffic the only interesting traffic)

line 125 126
modem InOut
autocommand ppp
transport preferred telnet
transport output telnet
autoselect during-login
autoselect ppp


.... let me know if this helps.

jason




"No hacker is worth missing a Dead concert for" - c.s.

 

[JH24]

Thanks for the information, however the setup that i have at the moment is with only one main 3660 router and the all the other routers in the remote offices are either 1600 or 2500 routers. The way i have set all these up is with Static routes as this seemed the simplest way of doing it and seems to work fine, so i am not sure if i can modify the above config to be able to work with Static routes.

Thanks
James

 

[jevansau99]

post your current config and i'll use what i posted to help you fill in the blanks. "No hacker is worth missing a Dead concert for" - c.s.