Section 3.0: ISDN Configuration
3.1: Basic ISDN
Configure legacy BRI on R1 and R3. Configure OSPF demand circuit for redundancy on R3.
3.2: PPP Callback
Configure R1 as callback server and R3 as callback client. Do not configure dialer-map on R1, as it will retrieve the callback number from the AAA server.
Configure AAA server with username "r3" and its callback attributes. Refer to Figure 1-5 for PPP callback user profile settings on ACS.
As a fallback, configure PPP authentication to local and a username "r3" on R1 with callback string:
aaa new-model aaa authentication ppp default group tacacs+ local aaa authorization network default group tacacs+ local ! username r3 callback-dialstring 99281766 password 7 094F471A1A0A
Figure 1-5 PPP Callback Settings on CiscoSecure ACS