Configure the ISDN interfaces on R2 and R3 as follows:
■ When R2's S0/0 goes down, R2 should place an outgoing call to R3.
■ R3 cannot call R2 under any circumstance.
■ Use PPP encapsulation and the strongest authentication available for the first B channel and HDLC on the second B channel.
■ To ensure that costs are kept to a minimum, never bring up more than one B channel unless traffic exceeds 59 percent.
■ When the Frame Relay link is restored, bring down the ISDN link after 25 minutes.
■ When the ISDN link is active, all routers must be able to ping and Telnet the local ISDN interfaces on R2 and R3.
■ You can use static or dynamic routing to complete this task.
BGP Routing Configuration (18 Points) 665
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