Question

Setup untagged VLAN's on Cisco Catalyst switch running COS

Asked by: amear

I need to setup a couple of VLAN's on our network. I have created the VLAN's on the switches, but need to add a port to the DEFAULT VLAN as tagged but have it untagged in the other 3 VLAN's . The switches are all running the CATOS so the switchport command is not present. How can I go about making the configuration.

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Asked On
2009-06-05 at 12:56:59ID24468135
Tags

VLAN

,

TAGGEG

,

UNTAGGED

,

CISCO

Topics

Network Design & Methodology

,

Wireless Local Area Network

,

Network Switches & Hubs

Participating Experts
2
Points
500
Comments
12

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Answers

 

by: apd32123Posted on 2009-06-05 at 17:04:40ID: 24560911

A port can only be untagged in one vlan as the switch would not be able to differentiate packets received from different vlans without tags.

 

by: amearPosted on 2009-06-05 at 17:29:49ID: 24560999

I apologize u are correct I need to tag it in multiple vlans while leaving it untagged in our default vlan. How would I accomplish this with the COS?

 

by: donjohnstonPosted on 2009-06-06 at 02:56:09ID: 24562520

A port can either be a trunk port (tagged) or an access port (untagged). Are you referring to native vlans?

If so, the following commands will create a trunk on port 3/5 and make vlan 1 the native vlan.

set vlan 1 3/5
set trunk 3/5 on dot1q
                                              
1:
2:

Select allOpen in new window

 

by: amearPosted on 2009-06-08 at 05:49:58ID: 24571245

So how would I add that same port to 3 other vlans that are untagged? I need the port to be tagged in VLAN 1, while being untagged in VLAN's 10, 20 and 30

 

by: apd32123Posted on 2009-06-08 at 05:52:35ID: 24571266

That is not possible as I referenced in my above post.

 

by: amearPosted on 2009-06-08 at 06:09:58ID: 24571481

I apologize again. I need the exact opposite. I need it untagged in a single VLAN while being tagged in 10,20 and 30. Not enough MD this morning....

 

by: donjohnstonPosted on 2009-06-08 at 09:23:50ID: 24573737

>I need it untagged in a single VLAN while being tagged in 10,20 and 30.

That's an 802.1q trunk. The untagged traffic is the "Native VLAN" and everything else is tagged.

int g0/1
 switchport trunk encap dot1q
 switchport trunk native 5 ! vlan 5 will be untagged
 switchport mode trunk
                                              
1:
2:
3:
4:

Select allOpen in new window

 

by: amearPosted on 2009-06-08 at 11:28:39ID: 24574917

Don,


Since we are running the COS the switchport command is not available.

 

by: donjohnstonPosted on 2009-06-08 at 11:39:34ID: 24575033

set vlan 5 3/1
set trunk 3/1 on dot1q

 

by: amearPosted on 2009-06-08 at 11:50:46ID: 24575121

Thanks for your help and patience. So this means that by default the other vlan's on the switch will be "tagged" and VLAN 5 will be untagged?

 

by: amearPosted on 2009-06-08 at 12:51:40ID: 24575651

Don,

Sorry to be a pest. Maybe I am misunderstanding or am not explaining the right way.

Long story short we will be using some sonicwal Access points to run multiple SSID's off each access point. Each SSID will be a member of a seperate VLAN. In order for the to work, Sonicwall says the port that the ACCESS point is connected to must be untagged in VLAN 100, but tagged in our SSID VLAN's which are 10, 20, 30. Our default VLAN is 1. Does that make more since? I see what you are saying by setting  port 3/1 vlan 100, I am untagging the port in VLAN 100, so how to I also TAG it in the other VLANs? I was able to do this on some HP switch's without alot of hassle, but I am having issues getting it to work with our Cisco Switches.

 

by: donjohnstonPosted on 2009-06-08 at 13:25:10ID: 24575953

A trunk port will tag all VLANs except the native VLAN.

set vlan 5 3/1 ! Makes VLAN 5 the native VLAN (and will not tag it)
set trunk 3/1 on dot1q ! makes the port a trunk and tags all VLANs except the native vlan.
 

20120131-EE-VQP-002

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