4 Port Switch module on Router

Unanswered Question
Oct 2nd, 2007


I have 4Port Switch Module installed on 3640 Router but cannot assign IP address to it...

Is there a way to assign IP address to these ports....

let me knwo the steps as well....

Thank You

I have this problem too.
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Kevin Dorrell Tue, 10/02/2007 - 05:03

I'm not sure whether the 4-port behaves in the same way as the 16-port, but on the 16-port version you assign the switchports to a VLAN, then you create an SVI interface to represent the VLAN at layer-3, and then put the IP address on that.

Kevin Dorrell


Edison Ortiz Tue, 10/02/2007 - 05:05

These are layer2 ports but you can create a Vlan, assign a Vlan membership to those ports and create a Switch Virtual interface.

For instance:

1) Create Vlan

vlan database

vlan 2 name Vlan2


2) Assign membership

interface f0/1

sw mode access

sw access vlan 2

3) Create SVI

interface vlan 2

ip address x.x.x.x x.x.x.x

Amin Shaikh Tue, 10/02/2007 - 09:58

Thanks for your reply....

I read some post and it as well narrates the same...


hoskuldurh Thu, 10/04/2007 - 07:23

Does entering "no switchport" before you do ip address etc... work? It works in dynamips :-)

Kevin Dorrell Thu, 10/04/2007 - 07:26

As far as I know, the 16-port NM supports layer-3 ports, but the 4-port WIC does not. Can anyone confirm that? Does the dynamips support it on both modules?

If the dynamips supports it but the real one doesn't that is very very interesting.

Kevin Dorrell


Edison Ortiz Thu, 10/04/2007 - 07:50

The 'no switchport' command works but you can't make that port a routed port.


interface FastEthernet1/1

description To R1 F0/0

no switchport

ip address

interface FastEthernet0/0

ip address

duplex auto

speed auto


*Mar 1 00:16:27.987: IP: tableid=0, s= (local), d= (FastEthernet1/1), routed via RIB

*Mar 1 00:16:27.991: IP: s= (local), d= (FastEthernet1/1), len 100, sending

*Mar 1 00:16:27.995: IP: s= (local), d= (FastEthernet1/1), len 100, encapsulation failed.

Success rate is 0 percent (0/5)

In short, it does not work :)


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