Is it possible to assign IP addresses to ports on the HWIC-4ESW module?

Answered Question
Jun 26th, 2008


I ordered a HWIC-4ESW module for my 2821 and want to use the ports for L3 point to point connections to my other routers but i cannot assign an IP address although the commands are available.

I get a message that it canot be configured on L2 links.

When i try the NO SWITCHPORT command , i get the message : this is not a convertible port.

Can someone confirm to me that it is impossible to make this a L3 link?

Or is there some cammond to convert it.

Thank you all in advance

I have this problem too.
0 votes
Correct Answer by Nagendra Kumar ... about 8 years 4 months ago
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Overall Rating: 3.8 (5 ratings)
rskrzek Thu, 06/26/2008 - 22:44


set up Interface Vlan X with IP Address and bind interface to this vlan



dvangyzeghem Thu, 06/26/2008 - 23:07

Thanks Romek

I will try this , it seems to be a valid workaround.

Does any one foresee anby possible issues with this workaround?

Thank you

Sushil Kumar Katre Fri, 06/27/2008 - 10:00


The module you are referring to HWIC-4ESW is a layer 2 switching module which is equivalent to a 4 port layer 2 switch.

Consider it as a 2950 or a 2960 switch with just 4 ports which is connected to a router over trunk.

The interfaces on this module have the layer 2 functionality which you have already identified while configuring it.

Its not possible to convert it into a layer 3 module However if you want to terminate a layer 3 link on that module you need to use the SVIs.

I have seen this setup working using SVIs at few of my customers who orderd this module by mistake assuming it to be a layer 3.

-> Sushil

glen.grant Fri, 06/27/2008 - 14:15

It like any other layer 3 type setup , the hwic is layer 2 and you do have layer 3 functionality thru SVI configurations . It works fine we have a number of them and use it feed subnets off of it . Just create the vlans in the vlan database and then create the SVI for that vlan and put the port on hwic into the vlan you want it to be in . Any device hung off that vlan will have a default gateway address of the SVI.

dvangyzeghem Sun, 06/29/2008 - 22:44

Thanks all for the helpfull reply's.

I still have an issue , no i what to do if i want to use this card, but if i do not want to use SVI's, what WIC card should i order.

I have been looking on the Cisco site but i cannot find a layer 3 ethernet module for a Cisco 2821.

Can anyone help me please?


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