WAN port and vLan

[amh4y0001]

Hi,

I have a CISCO 871 router and WAN interface is FastEthernet4.

I cant make it member of a vLan , or in other words, Switchport mode access is not available when I try to configure this interface.

Any ideas?

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

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Posting

An 871's F4 is most like other ISR routed ports.  F0..3 are like switch ports.  Their, F0..3 vs. F4, feature support is different, by design.

What kind of "idea" are you looking for?  I.e. what is it you want to do that you believe you cannot?

[amh4y0001]

Well, F4 is wan interface and I asked if can create a vlan, lets say Vlan2 and then make this F4 interface member of vlan2.

That's why Switchport mode access wasn't working for interface F4.

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Correct, you cannot assign F4 as a VLAN access port.  Why can you not use ports F0..3 for such a need?

Understand, an 871 is a router, that supports a few switchports, so you might be able to avoid the need to connect an external switch.

BTW, F4 might support VLAN tagging, if it supports subinterfaces.

[amh4y0001]

Hello,

No, there is no such need that WAN /outside interface must be in vLan.

I was assuming if outside interface should be member of vlan as inside interfaces does F0..F3 (in vlan 1).