R5#sh ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.1.3.3          0   FULL/  -        00:00:36    10.0.35.3       Serial0/1
R5#sh ip ospf int s0/1 | i auth
  Message digest authentication enabled
R5#sh ppp int s0/1 | i Auth
Se0/1 LCP:    AuthProto CHAP (0x0305C22305)
Se0/1 LCP:    AuthProto CHAP (0x0305C22305)
R5#sh run int s0/1
Building configuration...

Current configuration : 228 bytes
!
interface Serial0/1
 ip address 10.0.35.35 255.255.255.0
 encapsulation ppp
 ip ospf authentication message-digest
 ip ospf message-digest-key 1 md5 blah
 ip ospf 1 area 0
 ppp authentication chap
 serial restart-delay 0
end