R2#sh run int s 1/2
Building configuration...

Current configuration : 172 bytes
!
interface Serial1/2
 ip address 180.40.7.2 255.255.255.224
 ip rip triggered
 ip rip authentication mode md5
 ip rip authentication key-chain xxxx
 clock rate 64000



R3#sh run int s 1/2
Building configuration...

Current configuration : 154 bytes
!
interface Serial1/2
 ip address 180.40.7.3 255.255.255.224
 ip rip triggered
 ip rip authentication mode md5
 ip rip authentication key-chain xxxx