04-07-2010 09:21 PM - edited 03-06-2019 10:30 AM
hi experts,
i've got a cisco 1720 router. would like to know what is the default duplex setting for FE port?
cisco 1720 (MPC860) processor (revision 0x501) with 12288K/4096K bytes of memory.
Processor board ID JAD041306KV (1507224326), with hardware revision 0000
M860 processor: part number 0, mask 32
Bridging software.
X.25 software, Version 3.0.0.
1 FastEthernet/IEEE 802.3 interface(s)
1 Serial(sync/async) network interface(s)
32K bytes of non-volatile configuration memory.
4096K bytes of processor board System flash (Read/Write)
----------
1720#sh run int f0
Building configuration...
Current configuration:
!
interface FastEthernet0
description Customer Network
ip address X.X.X.X 255.255.255.224
no ip route-cache
no keepalive
speed auto
no cdp enable
end
Solved! Go to Solution.
04-07-2010 11:32 PM
How about "no full-duplex"? Make sure you set your speed to auto.
04-07-2010 09:30 PM
Hi,
The default duplex setting is to auto-negotiate.
You can check doing a ''sh int fas 0'' instead than ''sh run int fas0''
Federico.
04-07-2010 10:01 PM
thanks federico! i've configured this port for full-duplex and now want to revert back to auto-negotiate (default). could you assist how to revert back?
1720#sh run int f0
Building configuration...
Current configuration:
!
interface FastEthernet0
description Customer Network
ip address X.X.X.X 255.255.255.224
no ip route-cache
no keepalive
speed 100
full-duplex -->
no cdp enable
end
04-07-2010 10:42 PM
Try "speed auto" and then "duplex auto". I believe this IOS is one of those "if it's default, it won't appear" concept.
04-07-2010 10:59 PM
thanks federico! i've configured this port for full-duplex and now want to revert back to auto-negotiate (default). could you assist how to revert back?
1720#sh run int f0
Building configuration...Current configuration:
!
interface FastEthernet0
description Customer Network
ip address X.X.X.X 255.255.255.224
no ip route-cache
no keepalive
speed 100
full-duplex -->
no cdp enable
end
Hi,
Configure with below mentioned steps for auto configuration
Step 1 Router# configure terminal
Step 2 Router(Config)# interface ethernet 0/11
Step 3 Router(Config-if)# speed auto
Step 4 Router(Config-if)# duplex auto
Hope to Help !!
Ganesh.H
Remember to rate the helpful post
04-07-2010 11:24 PM
hi ganesh,
thanks for your inputs! however, this router doesn't support the command you've mentioned. is there a workaround to set the interface to "duplex auto"?
1720(config)#int f0
1720(config-if)#dup?
% Unrecognized command
1720(config-if)#full-duplex ?
1720(config-if)#half-duplex ?
04-07-2010 11:32 PM
How about "no full-duplex"? Make sure you set your speed to auto.
04-07-2010 11:38 PM
awesome! it worked! thank you!
1720(config-if)#no full-duplex ?
04-08-2010 12:41 AM
Thanks for the rating.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: