520 CHAPTER 27: DYNAMIC ROUTE B ACKUP CONFIGURATION[RouterB-Dialer0] ip address 20.0.0.2 24[RouterB-Dialer0] dialer user usera[RouterB-Dialer0] dialer-group 1[RouterB-Dialer0] dialer bundle 1[RouterB-Dialer0] dialer number 8810010[RouterB-Dialer0] ppp authentication-mode pap[RouterB-Dialer0] ppp pap local-user userb password simple userb[RouterB-Dialer0] quit# Configure dialup parameters for BRI 3/0.[RouterB] interface bri 3/0[RouterB-Bri3/0] dialer bundle-member 1[RouterB-Bri3/0] ppp authentication-mode pap[RouterB-Bri3/0] ppp pap local-user userb password simple userb[RouterB-Bri3/0] quit# Configure Serial 2/0 and enable X.25 on it.[RouterB] interface serial 2/0[RouterB-Serial2/0] link-protocol x25 dte ietf[RouterB-Serial2/0] x25 x121-address 20[RouterB-Serial2/0] x25 map ip 10.0.0.1 x121-address 10 broadcast[RouterB-Serial2/0] ip address 10.0.0.2 8[RouterB-Serial2/0] quit# Configure the interface loopback 1.[RouterB] interface loopback 1[RouterB-Loopback1] ip address 30.0.0.1 32[RouterB-Loopback1] quit# Configure the dynamic routing protocol RIP.[RouterB] rip[RouterB-rip-1] network 10.0.0.0[RouterB-rip-1] network 20.0.0.0[RouterB-rip-1] network 30.0.0.0[RouterB-rip-1] import-route directUsing One DynamicRoute Group to MonitorMultiple NetworkSegmentsNetwork requirements■ Router A and Router B are connected through a FR network, and they areconnected to each other through an ISDN switched network at the same time.Router A and Router B can dial each other. The telephone number of Router Ais 660330, and that of Router B is 660220.■ As the master device of the dynamic route backup function, Router A monitorsthe three network segments 10.0.0.1/8, 11.0.0.1/8, and 12.0.0.1/8 on RouterB.■ Normally, the FR link functions as the primary link between Router A andRouter B. When there is no valid route to any of the three network segments(that is, the logical relationship among the three network segments is "AND"),Router A will activate the backup link.
