Router R1 Configuration

Router R14 Configuration

R14(config)#username <remote name> password <isdnpassword>

R14(config)#isdn switch-type <switch type>

R14(config)#int bri 0/0

R14(config-if)#encapsulation ppp

R14(config-if)#ppp authentication [chap | pap]

R14(config-if)#ip address <ip addr> <subnet mask>

If Not using DDR

R14(config-if)#isdn spid1 <spid number> <dial number>

R14(config-if)#isdn spid2 <spid number> <dial number>

Or if using DDR

R14(config-if)#dialer-group 1 (Refers to dialer-list below)

R14(config-if)#dialer map ip <next hop ip addr> [ name <remote name> ] [speed 56 | 64 ] [ broadcast ] <dial number>

Or minimum configuration with no authentication would be:

R14(config-if)#dialer map ip <next hop ip addr> <dial number>

If simple profile

R14(config)#dialer-list 1 protocol ip permit (define interesting traffic)

Or if more complex

R14(config)#dialer-list 1 protocol ip list <access list number>

R14(config)#access-list <access list number> deny <protocol> any any eq <protocol to block>

R14(config)#access-list <access list number> permit ip any any (to allow ip)

R14(config)#Router RIP

R14(config-router)#network <ip addr> (IP of ISDN network)

Important, when using DDR, to install a static route, so that interesting traffic isn’t generated by routing updates

R14(config)#ip route <dest ip addr> <subnet mask> <ip of next hop, R15> (Ie to prevent flapping)

Router show and debug commands

show run

show isdn status (displays active/status information about layers 1, 2 and 3)

show isdn active (displays information about current active calls)

show interfaces bri 0/0

show dialer [int [bri]] (displays information about statistics, dialer state, bound to profile dialer)

debug isdn [ q921 | q931 ]

debug dialer events (tells you when a dialer is connected and what generated connection)

debug dialer packet (useful for troubleshooting flapping)

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