netdev - Re: set vlan CFI and TPID

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Message-ID: <AANLkTimRZezo4WYZiXfsra83AojMubrZap1d1r5KUst1@mail.gmail.com>
Date:	Mon, 13 Dec 2010 10:20:58 +0800
From:	hong zhiyi <zhiyi.hong@...il.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	netdev@...r.kernel.org
Subject: Re: set vlan CFI and TPID

On Mon, Dec 13, 2010 at 8:20 AM, Jesse Gross <jesse@...ira.com> wrote:
> On Tue, Dec 7, 2010 at 8:04 PM, hong zhiyi <zhiyi.hong@...il.com> wrote:
>> Hi All,
>>
>> May I ask how to set the 1 bit CFI and 2 bytesTPID in the VLAN header
>> by vconfig?
>
> You can't change them using vconfig.  For 802.1q/Ethernet, the TPID is
> 0x8100 and the CFI is 0.
>
>> and what is the meaning of the egress map and ingress map?
>
> These convert between the PCP bits found in the vlan header and the
> priority field that is used internally for QoS, which you access
> through tc.
>

Hi Jesse,

Thank you for your reply.

Then how can it set the value of the TPID and the CFI? Also, I do not
understand you mentioned the *tc* means, what is the tc?

Best Regards
Hong Zhiyi
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