HWIC-1GE-SFP "Switchport Trunk"

Unanswered Question
Aug 14th, 2007

I am trying to configure a HWIC-1GE-SFP on a 2821 as a 802.1q trunk to connect to a 3508 switch.

If i try a show int gig x/x/x I get "gig x/x/x is not a switchable port"

I read the documentation that these modules do support dot1q VLAN's so what am I missing?

SW version is c2800nm-ipvoicek9-mz.124-16.bin

I have this problem too.
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davecisco Tue, 08/14/2007 - 13:12

Are you trying to make this a trunk port and create sub-interfaces? If so try the no switchport command, then create your sub's.

Not sure if you can do this with the HWIC's though.

sundar.palaniappan Tue, 08/14/2007 - 13:13

Is the gig interface configured as a router port (no switchport). Can you try configuring the command 'switchport' under the interface?

sundar.palaniappan Tue, 08/14/2007 - 15:22

It appears HWIC-1GE-SFP is purely a layer 3 (router) interface. That makes sense as it doesn't support the 'switchport' command and the 'show int' command reveals it's not a switchable port. Moreover the product documentation shows 802.1q trunking is supported on this card.

In that case you should configure 802.1q subinterfaces on the router. This feature is called router-on-a-stick. The router can route all inter-vlan traffic with this feature. Configure the port on the switch that's connected to the 2800's router interface as 802.1q trunk.

Here's a sample configuration.

int g0/1.1

encapsulation dot1q 1 --> where 1 is the vlan #

int g0/1.2

encapsulation dot1q 2




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