Solved

Native Vlan Mismatch Impact

Posted on 2016-07-24
3
47 Views
Last Modified: 2016-08-08
Sometimes when you configure Native Vlan different than the default VLAN 1, you can see  the Vlan Mismatch error popping up on the terminal.
I wonder if this error is generated by CDP or STP. ?
I also would like to to know if it has any impact, seeing that the PING still work between hosts.?
is it something to worry about ?

Thanks
0
Comment
Question by:jskfan
3 Comments
 
LVL 27

Assisted Solution

by:Predrag Jovic
Predrag Jovic earned 250 total points
ID: 41726597
Native mismatch is notified by CDP(v2).
Effect is - if you use different native VLAN on trunks, you will forward traffic from one VLAN to another. Let's say on one side of trunk native VLAN is 10, and on the other side is 20 - broadcast on the VLAN 10 from the first switch will be propagated in VLAN 20 on the other switch.

You can also read this one regarding the effect that might happen.
0
 
LVL 9

Accepted Solution

by:
Ian Arakel earned 250 total points
ID: 41732385
Hi there,

The below link could be referred in context to the impact of vlan mismatch w.r.t SPANNING TREE

https://learningnetwork.cisco.com/docs/DOC-25797

May not be relevant:
In addition to above, you need to understand that tweaking the native vlan helps in mitigation vlan hopping attacks caused by double tagging.

https://www.nlogic.co/understanding-vlan-hopping-attacks/
0
 

Author Closing Comment

by:jskfan
ID: 41746985
Thank you
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
command "logging persistent size 100000000 filesize 200000" in ASR1K 5 30
High Density Switches 8 37
Switch Migration 8 43
Unifi AP 4 48
Tired of waiting for your show or movie to load?  Are buffering issues a constant problem with your internet connection?  Check this article out to see if these simple adjustments are the solution for you.
I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
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…

911 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now