ISDN Dial Backup Bundled with Serial Interface

[gary00001]

Hi All

I have a problem where i have a 512k serial line from a branch Office into my core. I have applied for additional bandwidth but can only get it later in the year due to Telco problems.

I have a PRI used for dial backup and dialin users, can i get the isdn to dial up and bundle with my primary link when a threshold is reached.

[attrgautam]

Yes it is possible though performance wil be hit. You can use backup interface and backup load threshold which will trigger the backup when the threshold configured is reached.

HTH

[gary00001]

I have done that, it seems to acknowledge the fact that the interface needs to come up but it does not dial the interface up

[spremkumar]

hi

Can you post the config of your router here (with public ips and passwds masked )?

regds

[gary00001]

interface Serial1/0:1

description lancet-jhb

mtu 600

bandwidth 512

backup interface Dialer1

backup load 20 10

ip address (ip address)

encapsulation ppp

ip mroute-cache

load-interval 30

no fair-queue

down-when-looped

no cdp enable

ppp multilink

interface Dialer1

description ISDN Dialup/Backup

no ip address

encapsulation ppp

dialer in-band

dialer idle-timeout 900

dialer string 70113580980

dialer-group 1

no peer default ip address

no fair-queue

no cdp enable

ppp authentication chap

ppp chap hostname PILLMAC

ppp chap password 7 ##############

ppp multilink

[attrgautam]

1) Wonder why you need the multilink on the serial

2) Can you show the routes in the router ? The Route to Dialer should be of the same AD as the route to the Serial. THen it will dial out

[gary00001]

i accidently left it on i was going to put ppp multilink on the interface for Interleaving

ip route 172.16.0.0 255.255.0.0 192.168.2.5 100 - Serial

ip route 172.16.0.0 255.255.0.0 192.168.3.1 200 - Dialer

Should i have an ip address on my Dialer Interface or unnumbered

[attrgautam]

I would suggest using the ip unnumbered if you are getting a static IP on the dialer. That is the reason why i think it isnt dialing out.