Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Configuring multiple VLANs for a single port

I would like to configure a 3750 switch port to be able to use two vlans. I know you can do this with a voice and data vlan, but what about two data vlans ? Say I have two devices, one on a 10 subnet and the other on a 172 subnet, but i only have one wall jack for both devices to plug into. So I use a mini switch to connect both devices and connect the switch to the wall jack; and of course this all leads back to one switch port. When I go to enter the switchport access vlan 172 cmd, how would I also make it so the device on the 10 subnet could route out ?

Sent from Cisco Technical Support iPad App

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions
Purple

Re: Configuring multiple VLANs for a single port

  No you can have multiple trunk ports configured  but it won't help you if you are going to a unmanaged miniswitch that can't trunk .

9 REPLIES
New Member

Configuring multiple VLANs for a single port

if you want it to use multiple VLANs then I think you are going to have to make it a trunk port.

Therefore:

switchport trunk encap dot1q

switchport mode trunk

switchport trunk vlan allowed VL1,VL2

Dan

New Member

Re: Configuring multiple VLANs for a single port

Iwas hoping not to have to configure a users port as a trunk port. But that was what I was thinking I would have to do. Are there any consequences that could come with having multiple trunk ports on a switch in my scenario ? The only other port I have trunked are the two etherchannled uplink ports back to the distribution switch.

Sent from Cisco Technical Support iPad App

Purple

Re: Configuring multiple VLANs for a single port

  No you can have multiple trunk ports configured  but it won't help you if you are going to a unmanaged miniswitch that can't trunk .

Re: Configuring multiple VLANs for a single port

It a stupid idea, really supid, but I'm not sure what kind of device u want to connect to that wall jack. If it is just a testdevice for example you can devide the 4 pairs in 2 x 2 pairs, so you can use one cable and have to ports on every side...

just an idea, because I see no ather than a trunk if your small switch supports that..

regards,

Sebastian

New Member

Re: Configuring multiple VLANs for a single port

Yes, Sebastian, I agreed on you. I am thinking though what's the purpose of the question?

..but anyway, to answer the question, hmmm i don't think so.

New Member

Re: Configuring multiple VLANs for a single port

Glen your right. I think this is my problem.

Sent from Cisco Technical Support iPad App

Silver

Configuring multiple VLANs for a single port

We featured your question on our page. Check out the responses here: http://www.facebook.com/CiscoSupportCommunity/posts/263782097049793

---

Posted by WebUser Cisco NetPro from Cisco Support Community App

Silver

Configuring multiple VLANs for a single port

Create a trunk to transport data traffic from multiple vlans over a single link to another switch. If you want to send untagged data over that link, use native vlan command.

---

Posted by WebUser Neeraj Jagga from Cisco Support Community App

New Member

Re: Configuring multiple VLANs for a single port

This is a good idea. It's sort of the same thing I do for rspan traffic when doing port spanning.

Sent from Cisco Technical Support iPad App

5741
Views
0
Helpful
9
Replies