Understanding the native Vlan and 802 1Q tagged frame

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802.1Q is a standard protocol used by switches to multiplex vlan traffic
What's in the 802.1Q tag?
TPID Tag protocol identifier
TCI Tag control information
Priority code point (PCP) used for quality of service
Drop eligible indicator (DEI) used in conjunction with PCP
VLAN identifier (VID) specify the vlan number

[timnachname]

This is really the best Explanation of the most important differences between vlan tagging and native vlan out there! I was so impressed that i made a Google account only to write you that!
It also gives you a brief insight of how traffic can jump across VLAN boundaries without a router, funny thing...
I´m looking for your next presentation!

[MEANASSJAMSTER]

use everything BUT vlan 1 ....put native as 555 if you want... - connect only honeypots and so on vlan 1....

[TheAmazeer]

it s clear although you have bad labelled your pc's switches and vlans . but i know now why native vlan are not tagged as it is default vlan mode of any cisco switch.. merci.. Sometimes it s hard to follow you as you make mistakes and correct them right away ...

[richdavis]

Good video. Thanks for breaking it down and explained in an easy to understand way.

[VitorEngRN]

Great lesson! Congratulations. Did you already try with 3 switches and a different native VLAN on the second LAN segment? In my project, first segment is configured with VLAN1 as native and the second one using VLAN10 as native. VLAN1 frames behaves perfectly on both (as native and non-native VLAN) segments but VLAN 10 frames don't. They cross the native 1 VLAN segment using 802.1Q but keep using the tag even on native VLAN 10 segment. Do you have any ideas of what maybe's happening?

[dharamdevsharma]

Well this video is very work Moustapha.

[jaideepsarkar]

a briliant  explanation ever of the Native VLAN mismatching scenario.Wating 4 ur more videos .

[gusmcknight]

Great explanation of how switches handle the native vlan. I did not know CPT would do this level of detail. Excellent for learning. I think the final packet was flooded out all VLAN 10 ports (only one in this case) since the destination MAC address was unknown on VLAN 10.

[bradleyjosephs]

I appreciate the video. I learned a lot.

[Ashish-wkfw]

Hi this is verry nice video...one question 1) when packet reaches switch1 how it will know destination mac address when switch is brought up for the first time.How switch1 decides destination mac address lies via trunk and switch2? can u please explain

[phabyamardy]

up until this point i was confused about the native vlan. Now the quest I have is, how do we determine what traffic (PC) to put in the native vlan?

[ruchiryou]

Its good explanation about Q tagging. I am looking forward to see group addressing scheme in Vlan aware bridge (Q tag).

[deepoce]

May i know what software is that u use for this simulation?