I CANT ENABLE THE INTERFACE ON CISCO 1841 ROUTER 1

[faithful4u]

I backup startup config and earsed on router. Then i restart and copy the configuration but the problem is i cant enable the atm interface. i did goto global configurationa and then i enter into interface and i type NO SHUT but still i when i use command "ip interface brief" still its administratively down. what to do

 

[baddos]

Can you post the configuration for that interface?

 

[faithful4u]

Router#sh start
Using 1270 out of 196600 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Las-Vegas
!
boot-start-marker
boot-end-marker
!
enable secret 5 $1$dKX7$57lD4kZQDDbK0AJJPLLUw.
!
no aaa new-model
ip cef
!
!
!
!
multilink bundle-name authenticated
!
!
archive
log config
hidekeys
!
!
!
!
!
interface FastEthernet0/0
ip address 62.150.76.65 255.255.255.192 secondary
ip address 62.150.215.1 255.255.255.128
duplex auto
speed auto
!
interface FastEthernet0/1
no ip address
duplex auto
speed auto
!
interface ATM0/0/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0/0/0.1 point-to-point
ip address 172.16.87.102 255.255.255.252
pvc 8/80
encapsulation aal5snap
!
!
interface ATM0/1/0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0/1/0.1 poi
ip address 172.16.87.138 255.255.255.252
pvc 8/80
encapsulation aal5snap
!
!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 172.16.87.101
ip route 0.0.0.0 0.0.0.0 172.16.87.137
!
!
ip http server
!
snmp-server community lasvegas RO
snmp-server community LAS RO
!
!
control-plane
!
!
line con 0
line aux 0
line vty 0 4
password
login
!
scheduler allocate 20000 1000
end


This router was working obsolutely fine, i crack the router password through rommon then i did pasted the original router running config which i pasted here. All the interfaces were down i did enable the fastethernet through NO SHUT command. but i cant enable ATM interfaces, Even though i gave NO Shut at each interface still they are "Administratively Down". I did practice on my router 1841 at home still the same. Then i called technical suport he came in 2 mins he enabled but i dont know what he did exactly.

Thanks.

 

[jedi1337]

Its probably just missing a carrier signal

 

[faithful4u]

may be you are true about carrier signal. But the router was working, wht i did was i enter to rommon mode change the register setting so tht i can boot router without configuration so that i can get the enable password from "startup config" then i copied back the startup config to the router. but the problem is i cant enable the router interface, even though i gave NO SHUT command still the same its administratively down.

Then i inform to technical support the engineer visited the site and he did something in the configuration then it starts working, that time i was away from the site.

 

[faithful4u]

Even though if there is no carrier signal when i apply NO SHUT command then the interfaec should be

Status : UP

Protocol : Down

but its alwys "Administratively down"

when i use "ip interface brief" after NO SHUT command

 

[baddos]

Post the following:

show interface ATM0/0/0
show interface ATM0/1/0
show dsl interface atm0
show dsl interface atm1

 

[faithful4u]

HCC-MD(config)#do sh ip interface brief
Interface IP-Address OK? Method Status Prot
ocol
FastEthernet0/0 192.168.1.1 YES NVRAM up down

FastEthernet0/1 unassigned YES NVRAM administratively down down

ATM0/1/0 unassigned YES NVRAM administratively down down

ATM0/1/0.1 10.250.7.2 YES NVRAM administratively down dow


HCC-MD(config)#interface atm0/1/0.1
HCC-MD(config-subif)#no shut
HCC-MD(config-subif)#do sh ip interface brief
Interface IP-Address OK? Method Status Prot
ocol
FastEthernet0/0 192.168.1.1 YES NVRAM up down

FastEthernet0/1 unassigned YES NVRAM administratively down down

ATM0/1/0 unassigned YES NVRAM administratively down down

ATM0/1/0.1 10.250.7.2 YES NVRAM administratively down down


THIS IS MY ROUTER AT HOME, WHERE THERE IS NO DSL CONNECTION. AT WORK I DID THE SAME WHERE THERE IS DSL CONNECTION BUT INTERFACE CANT BE UP.

 

[brianinms]

You need to no shut int atm 0/1/0 , not the subinterface. Are you sure the pvc is correct?

 

[faithful4u]

Thanks boss.... thats work for me fine. Can you please tel me what is the difference between interface and subinterface.....

 

[EmuDan]

The interface is a physical port, such as ATM 0/0/0 while a subinterface is a logical port (ATM 0/0/0.#) You are limited by the number of physical interfaces depending on the number of slots your router supports, but the logical subinterfaces, I believe are nearly unlimited.

Dan