Solved

Tag Native VLAN on Cisco 2801

Posted on 2012-04-02
9
789 Views
Last Modified: 2012-04-07
Hi

We have two Cisco 2801 that connects two offices.

We where running the traffic over serial interface but now we got a new provider of the comunication line. They could only deliver a line with TCP/IP so we had to change to fast ethernet on both routers.

They say that we have to tag the native VLAN 1 traffic over the line.
Must we use Trunks or Subinterfaces or what?

We have tried to change the configuration with no success.

How do we set this up correctly ?

The cisco 2801 is running 12.4(16a).
0
Comment
Question by:IntesyNordic
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
9 Comments
 
LVL 15

Expert Comment

by:Nayyar HH (CCIE RS)
ID: 37799694
If they say you should tag vlan 1 then use sub-interfaces

Check your device can support the configurations below; Its the latter config you need to support


Traffic sent across VLAN1 below is NOT tagged

interface FastEthernet0/0.1
 encapsulation dot1Q 1 native



Traffic sent across VLAN1 below is tagged

interface FastEthernet0/0.1
 encapsulation dot1Q 1
0
 

Author Comment

by:IntesyNordic
ID: 37805621
The router adds native by itself when we enter the command encapsulation dot1Q 1.
We can't see any other commands in the running-config that have any effect on this.

Any ideas?
0
 
LVL 15

Assisted Solution

by:Nayyar HH (CCIE RS)
Nayyar HH (CCIE RS) earned 500 total points
ID: 37805833
I thought you might get that behaviour - I'm afraid you may not be able to send tagged frames out on VLAN 1

However on a switch such as the 3550 you can achieve this by the command "vlan dot1q tag native"

So can you introduce a switch between the router and the service provider?

Before proceeding further I would ask the SP some questions?

Why do they require data on VLAN 1 to be sent tagged? Could they not present the service to you on any other VLAN such as VLAN2 (tagged)? [ Reason: your equipment doesn't support sending tagged frames on VLAN1]
0
Limited time offer using promo code EXPERTS25

Designed with a wealth of functionality and convenience, ATEN's new Thunderbolt™ 2 Sharing Switch takes your Thunderbolt setup to the next level. Now through August 31, 2017, Experts Exchange members get 25% off the US7220 on the ATEN USA eShop using promo code EXPERTS25.

 

Accepted Solution

by:
IntesyNordic earned 0 total points
ID: 37806271
The SP said that because of the hardware platform in one of the locations they had to have tagged traffic thru the line. We can't argue with them on that.
We will look into new routers or switches.

Thanks for the help.
0
 

Author Comment

by:IntesyNordic
ID: 37806346
I've requested that this question be closed as follows:

Accepted answer: 0 points for IntesyNordic's comment #37806271

for the following reason:

Feedback answer.
0
 
LVL 15

Expert Comment

by:Nayyar HH (CCIE RS)
ID: 37806347
Post ID: 37805833 provides a solution/workaround - some points should be awarded for this post at least
0
 

Author Comment

by:IntesyNordic
ID: 37806408
Sorry about that, I'am new to this. How do i set points.
0
 
LVL 15

Expert Comment

by:Nayyar HH (CCIE RS)
ID: 37806547
No problem - I think you should have the option of accepting a post as the solution and then awarding points
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Quality of Service (QoS) options are nearly endless when it comes to networks today. This article is merely one example of how it can be handled in a hub-n-spoke design using a 3-tier configuration.
How to set-up an On Demand, IPSec, Site to SIte, VPN from a Draytek Vigor Router to a Cyberoam UTM Appliance. A concise guide to the settings required on both devices
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Suggested Courses
Course of the Month3 days, 11 hours left to enroll

630 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question