Configure IP Address on NM-16

Unanswered Question
May 23rd, 2009


I have a Cisco 3725 with Etherswitch NM-16ESW. I was able to configure an IP address on one of the Etherswitch's port before but now:

C3725(config)#int f1/2

C3725(config-if)#ip add

C3725(config-if)#ip address

% IP addresses may not be configured on L2 links.

C3725(config-if)#no swi

C3725(config-if)#no switchport

% Incomplete command.

C3725(config-if)#ip address

% IP addresses may not be configured on L2 links.

When I do a show inventory - I can't see the Etherswitch - whereas before I can:

C3725_NETFLOW#sh inventory

NAME: "3725 chassis", DESCR: "3725 chassis

I was thinking of a hardware failure of the Etherswitch - but when I show its status - its is ok:

Fa1/2 DESC connected 1 a-full a-100 unknown

When I enabled CDP - I can see the directly connected switch to f1/2?

Any ideas?




I have this problem too.
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Richard Burts Sun, 05/24/2009 - 13:41


Instead of show inventory I would suggest that you check the output of show version or the output of show diag. I believe that either of these is a better way to verify what hardware is recognized and functional.

Also I believe that your error is in attempting to put an IP address on the FastEthernet1/2 interface. As the error indicates the switch is treating this as a layer 2 only interface. And in contrast to most layer 3 switches which support the no switchport command to enable layer 3 processing on the interface, this kind of Etherswitch does not support it. What it does support are SVIs (interface vlan n). So put the FastEthernet1/2 interface into a different VLAN, configure the VLAN interface for that VLAN, and configure the IP address on that VLAN interface.



Leo Laohoo Sun, 05/24/2009 - 14:30

As the error message shows, NM-16ESW is a Layer 2-only switch. The only port you can configure an IP Address would have to be the VLAN interface. I think you need the NME-16ES-1G.

Sam Smiley Thu, 05/28/2009 - 14:54

Hi Tony,

You almost have it, the command is...

no switchport fa1/7

This will configure NM-16ESW in NM slot 1 interface #7 to a L3 port. Once this is done you can assign an IP address to the interface.



Sam Smiley Thu, 05/28/2009 - 18:11

It could depend on the IOS installed, I'm running 12.4-19 advent on a 2620XM that this does work on. The original poster didn't say what IOS image was on the machine.


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