Cisco 837 configurazione con ip subnet-zero e ip classless

[paolo1977]

Ciao a tutti,
Ho un problema con il mio Cisco 837 che non mi permette di salvare nella run-config i comandi di "ip subnet-zero" e "ip classless".

L'IOS e' il Version 12.4(5b).

dopo che scrivo:
"ip subnet-zero" o "ip classless" e faccio ctrl-Z e sh ru non vedo questi comandi.

Qualcuno sa spiegarmi il perche'?

Ciao

Di seguito il sh ru:

Current configuration : 973 bytes
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname RTRSSS
!
boot-start-marker
boot-end-marker
!
no logging buffered
!
no aaa new-model
!
resource policy
!
no ip source-route
!
!
no ip cef
ip name-server 151.99.125.2
ip name-server 151.99.250.2
!
!
!
!
interface Ethernet0
ip address X.Y.Z.K 255.255.255.248
no ip mroute-cache
hold-queue 100 out
!
interface ATM0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
ip address X.X.X.X 255.255.255.254
no snmp trap link-status
pvc 8/35
protocol ip X.X.X.X
!
!
ip route 0.0.0.0 0.0.0.0 ATM0.1
ip route X.Y.Z.K 255.255.255.248 ATM0.1
no ip http server
no ip http secure-server
!
!
access-list 23 permit 10.30.0.0 0.0.255.255
no cdp run
!
control-plane
!
!
line con 0
no modem enable
line aux 0
line vty 0 4
login
!
scheduler max-task-time 5000
end

[Wizard]

Ci saranno di default...