R2#sh run int f 0/1
Building configuration...

Current configuration : 225 bytes
!
interface FastEthernet0/1
 ip address 200.1.1.2 255.255.255.0
 no ip proxy-arp
 ip irdp
 ip irdp maxadvertinterval 10
 ip irdp minadvertinterval 10
 ip irdp holdtime 30
 ip irdp preference 100
 duplex auto
 speed auto
end

R2#
RACK18AS>4
[Resuming connection 4 to r4 ... ]

R4#sh run | b ip irdp
R4#sh run | b irdp
ip gdp irdp
!
!
!
!
call rsvp-sync
!
!
mgcp profile default
!
dial-peer cor custom
!
!
!
!
line con 0
 exec-timeout 0 0
 logging synchronous
line aux 0
line vty 0 4
 privilege level 15
 no login
!

R4#
RACK18AS>5
[Resuming connection 5 to r5 ... ]

S5(config)#^Z
S5#sh r
04:51:54: %SYS-5-CONFIG_I: Configured from console by console
S5#sh run | b ip default
ip default-gateway 17.57.100.22   <------------also on R7, could have been IRDP
ip classless
ip http server
!
!
!
line con 0
 exec-timeout 0 0
 logging synchronous
line vty 0 4
 login
line vty 5 15
 login
!
end

S5#