r2 r3 r4 r5 r6 FR Area 0 s0 s0/0 Ring 20 To0/0 e0 Backbone 2 BGP 254 VlanA Area 3 s0 s1 s0 To0/0 Ring 10 VlanB Area 5 ISDN Phone A Phone B e0/0 Backbone 1 r1