CCIE Security Exam Certification Guide

Basic ISDN Configuration (0.5 Hours)

ISDN switch information:

• ISDN switch type: basic-5ess.

• ISDN numbering:

  - R1: 0298017705

  - R4: 0296307050

• SPIDs are not required.

Configure the ISDN interfaces on R1 and R4 as follows:

• When R1's S0 goes down, R1 should place an outgoing call to R4.

• R4 cannot call R1 under any circumstance.

• Use PPP encapsulation and the strongest authentication available.

• Never bring up more than one B channel to ensure that costs are kept to a minimum.

• When the Frame Relay link is restored, bring down the ISDN link after 25 minutes.

• When the ISDN is active, all routers must be able to ping and telnet the local ISDN interfaces on R1 and R4.