ISDN

=Basic Configuration=

config# interface bri 0 config-if# ip address .... .... config-if# isdn switch-type basic-5ess config-if# isdn spid1 111 config# dialer-list 1 protocol ip permit (specified interesting traffic) config# interface bri 0 config-if# dialer-group 1 config-if# encapsulation ppp config-if# ppp multilink config-if# dialer load-threshold 1...255 [either|inbound|outbound] (before another B channel is loaded) config-if# dialer map ip 172.20.1.1 broadcast 4802222222 config-if# dialer map idle-timeout 120

=Demand Dialing=

Floating Static Routes
config# ip route 192.168.2.0 255.255.255.0 172.20.1.2 **250** config# ip route 172.16.0.0 255.255.0.0 172.20.1.2 **250**

Backup Interface
config# interface s0/0 config-if# backup interface bri 0 config-if# backup delay 3 15 (activate and deactivate timers)

OSPF
config# router ospf 1 config-router# network 172.20.1.1 0.0.0.0 area 0 config# interface bri 0 config-if# ip ospf demand-circuit (suppresses hello messages)

NOTE: Put ISDN into own area (stub/totally stub) to avoid routes from ASBR that keep the connection alive.

Dialer Watch
config# dialer watch-list 1 ip 172.16.4.0 255.255.255.0 (specific network, not summarized) config# interface bri 0 config-if# dialer watch-group 1 config-if# dialer map ip 172.16.4.0 4801111111