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Re: [1904.2 TF] VLAN tags

Here is one place. You can see complaint frame formats on the left and right of that picture.

 

 

-Glen

 

From: Kevin Noll [mailto:kevin.noll@xxxxxxxxxxxx]
Sent: Wednesday, August 19, 2020 10:36 AM
To: Glen Kramer <glen.kramer@xxxxxxxxxxxx>; STDS-1904-2-TF@xxxxxxxxxxxxxxxxx
Subject: Re: [1904.2 TF] VLAN tags

 

As I understand 802.1Q, the framework in 802.1Q allows an arbitrary number of tags to be in a frame.

 

Can you point me to specific text in 802.1Q that prohibits or limits support to 2 tags?

 

--

Kevin A. Noll

 

From: Glen Kramer <glen.kramer@xxxxxxxxxxxx>
Date: Wednesday, August 19, 2020 at 11:32 AM
To: Kevin Noll <kevin.noll@xxxxxxxxxxxx>, "STDS-1904-2-TF@xxxxxxxxxxxxxxxxx" <STDS-1904-2-TF@xxxxxxxxxxxxxxxxx>
Subject: RE: [1904.2 TF] VLAN tags

 

Kevin,

 

This was not an arbitrary decision. Both 802.1Q and 1904.1 define frame formats and operations on double-tagged frames. There is no specification defining the format or processing operations for triple- or quadruple-tagged frames.

 

So, if a user classifies and manipulates the 3rd and 4th tag, what existing standard defines that processing? In 802.1, the ISS interface shows that frames can have just two tags S-TAG and C-TAG (I am not taking about I-tagged frames, which are very different).

 

 

-Glen

 

From: Kevin Noll [mailto:kevin.noll@xxxxxxxxxxxx]
Sent: Tuesday, August 18, 2020 10:14 AM
To: STDS-1904-2-TF@xxxxxxxxxxxxxxxxx
Subject: [1904.2 TF] VLAN tags

 

Currently the draft allows classification and manipulation on up to 2 VLAN tags. Recalling the discussion that settled on 2 tags, this was a somewhat arbitrary decision that was made to allow the discussion to move on.

 

It is common to have more than 2 tags.

 

How would a user classify on or manipulate a 3rd or 4th tag, or an arbitrary tag depth?

 

--kan--

--

Kevin A. Noll

 

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