ISDN & DDR

Key Commands Shows and Debugs

interface BRI0
no ip address
encapsulation ppp
no ip mroute-cache
dialer pool-member 1
isdn switch-type basic-dms100
isdn spid1 31787618460101 8761846
isdn spid2 31787618480101 8761848
ppp authentication chap
ppp multilink
interface Dialer1
ip address 146.84.131.241 255.255.255.0
no ip directed-broadcast
ip nat outside
encapsulation ppp
dialer remote-name indy-as5300
dialer idle-timeout 3600
dialer string 5547499
dialer load-threshold 25 either
dialer pool 1
dialer-group 1
ppp authentication chap
ppp multilink
Show isdn stat
Show dialer (for idle timers)
Show int dialer X
Show show int bri 0:1 or 0:2

Load is /255, can also use keywork “never”

Snapshot routing on client side:
Dialer map snapshot 60 5551212
Snapshot client 5 1200 spress-state-change dialer
Or Snapshot client 5 1200 dialer (active & quiet
time) Server:
Snapshot server <active time> dialer

Callback, server:
dialer callback-secure
dialer enable-timeout 2
ppp callback accept
dialer map ip 7.1.1.8 name atlanta class dial1 555..
map-class dialer dial1
dialer callback-server username

on client:
ppp callback request

Make sure you have BROADCAST in ALL your dialer
map statements. This goes for frame-relay too!

Remember “ip ospf demand-circuit” when dealing
with ospf

When using backup interface, activating the
backup only makes the dialer interface go from
standby to active. Something else (such as an
ospf hello or interesting traffic) has to