RA#show running-config Building configuration... Current configuration : 1185 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname RA ! ! ! ! ! ! ! ! ip cef no ipv6 cef ! ! ! ! license udi pid CISCO2911/K9 sn FTX1524VC8D ! ! ! ! ! ! ! ! ! ! ! spanning-tree mode pvst ! ! ! ! ! ! interface GigabitEthernet0/0 ip address 172.31.0.1 255.255.254.0 duplex auto speed auto ! interface GigabitEthernet0/1 no ip address duplex auto speed auto shutdown ! interface GigabitEthernet0/2 no ip address duplex auto speed auto shutdown ! interface Serial0/0/0 ip address 172.31.4.1 255.255.255.252 clock rate 2000000 ! interface Serial0/0/1 no ip address clock rate 2000000 shutdown ! interface Serial0/1/0 no ip address clock rate 2000000 shutdown ! interface Serial0/1/1 no ip address clock rate 2000000 shutdown ! interface Vlan1 no ip address shutdown ! router ospf 1 router-id 1.1.1.1 log-adjacency-changes passive-interface GigabitEthernet0/0 network 172.31.0.0 0.0.1.255 area 0 network 172.31.4.0 0.0.0.3 area 0 ! router rip ! ip classless ! ip flow-export version 9 ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 ! line aux 0 ! line vty 0 4 login ! ! ! end RA# ****************************************************** RB#show running-config Building configuration... Current configuration : 1363 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname RB ! ! ! ! ! ! ! ! ip cef ipv6 unicast-routing ! no ipv6 cef ! ! ! ! license udi pid CISCO2911/K9 sn FTX1524VLXS ! ! ! ! ! ! ! ! ! ! ! spanning-tree mode pvst ! ! ! ! ! ! interface GigabitEthernet0/0 ip address 172.31.2.1 255.255.254.0 duplex auto speed auto ipv6 address FE80::1 link-local ipv6 address 2001:DB8:1::1/64 ipv6 ospf 1 area 0 ! interface GigabitEthernet0/1 no ip address duplex auto speed auto shutdown ! interface GigabitEthernet0/2 no ip address duplex auto speed auto shutdown ! interface Serial0/0/0 ip address 172.31.4.2 255.255.255.252 ! interface Serial0/0/1 no ip address ipv6 address 2001:DB8:2::1/64 ipv6 ospf 1 area 0 clock rate 2000000 ! interface Serial0/1/0 no ip address clock rate 2000000 shutdown ! interface Serial0/1/1 no ip address clock rate 2000000 shutdown ! interface Vlan1 no ip address shutdown ! router ospf 1 router-id 2.2.2.2 log-adjacency-changes passive-interface GigabitEthernet0/0 network 172.31.2.0 0.0.1.255 area 0 network 172.31.4.0 0.0.0.3 area 0 ! ipv6 router ospf 1 router-id 2.2.2.2 log-adjacency-changes ! ip classless ! ip flow-export version 9 ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 ! line aux 0 ! line vty 0 4 login ! ! ! end RB# ******************************************************* RC#show running-config Building configuration... Current configuration : 1021 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname RC ! ! ! ! ! ! ! ! ip cef ipv6 unicast-routing ! no ipv6 cef ! ! ! ! license udi pid CISCO2911/K9 sn FTX15248GJT ! ! ! ! ! ! ! ! ! ! ! spanning-tree mode pvst ! ! ! ! ! ! interface GigabitEthernet0/0 no ip address duplex auto speed auto ipv6 address FE80::3 link-local ipv6 address 2001:DB8:3::1/64 ipv6 ospf 1 area 0 ! interface GigabitEthernet0/1 no ip address duplex auto speed auto shutdown ! interface GigabitEthernet0/2 no ip address duplex auto speed auto shutdown ! interface Serial0/0/0 no ip address ipv6 address 2001:DB8:2::2/64 ipv6 ospf 1 area 0 ! interface Serial0/0/1 no ip address clock rate 2000000 shutdown ! interface Vlan1 no ip address shutdown ! ipv6 router ospf 1 router-id 3.3.3.3 log-adjacency-changes ! ip classless ! ip flow-export version 9 ! ! ! ! ! ! ! line con 0 exec-timeout 0 0 ! line aux 0 ! line vty 0 4 login ! ! ! end RC# ******************************************************** SA#show running-config Building configuration... Current configuration : 1039 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname SA ! ! ! ! ! spanning-tree mode pvst ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 no ip address shutdown ! ! ! ! line con 0 ! line vty 0 4 login line vty 5 15 login ! ! end SA# ******************************************************** SB>enable SB#show running-config Building configuration... Current configuration : 1039 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname SB ! ! ! ! ! spanning-tree mode pvst ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 no ip address shutdown ! ! ! ! line con 0 ! line vty 0 4 login line vty 5 15 login ! ! end SB# ******************************************************** SC#show running-config Building configuration... Current configuration : 1039 bytes ! version 12.2 no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption ! hostname SC ! ! ! ! ! spanning-tree mode pvst ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 no ip address shutdown ! ! ! ! line con 0 ! line vty 0 4 login line vty 5 15 login ! ! end SC# ******************************************************** PCA: PC>ipconfig FastEthernet0 Connection:(default port) Link-local IPv6 Address.........: FE80::203:E4FF:FE54:1CA9 IP Address......................: 172.31.1.254 Subnet Mask.....................: 255.255.254.0 Default Gateway.................: 172.31.0.1 ******************************************************** PCB: PC>ipconfig FastEthernet0 Connection:(default port) Link-local IPv6 Address.........: FE80::1 IP Address......................: 172.31.3.254 Subnet Mask.....................: 255.255.254.0 Default Gateway.................: 172.31.2.1 PC>ipv6config FastEthernet0 Connection:(default port) Link-local IPv6 Address.........: FE80::1 IPv6 Address....................: 2001:DB8:1::2/64 Default Gateway.................: 2001:DB8:1::1 DHCPv6 Client DUID..............: 00-01-00-01-E8-23-A1-0D-00-01-63-21-05-A3 ******************************************************** PCC: PC>ipv6config FastEthernet0 Connection:(default port) Link-local IPv6 Address.........: FE80::3 IPv6 Address....................: 2001:DB8:3::2/64 Default Gateway.................: 2001:DB8:3::1 DHCPv6 Client DUID..............: 00-01-00-01-70-E7-53-18-00-0D-BD-B9-29-A9 PC>