From mboxrd@z Thu Jan 1 00:00:00 1970 From: yao zhao Subject: Re: VLAN 1 - Native Date: Wed, 1 Feb 2012 11:25:31 -0500 Message-ID: References: <1328095366.10975.YahooMailNeo@web29004.mail.ird.yahoo.com> <1328095449.75127.YahooMailNeo@web29014.mail.ird.yahoo.com> <1328101484.2595.17.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> <1328108723.2595.33.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Leonardo Uzcudun , "netdev@vger.kernel.org" To: Eric Dumazet Return-path: Received: from mail-tul01m020-f174.google.com ([209.85.214.174]:61270 "EHLO mail-tul01m020-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755862Ab2BAQZc convert rfc822-to-8bit (ORCPT ); Wed, 1 Feb 2012 11:25:32 -0500 Received: by obcva7 with SMTP id va7so1487274obc.19 for ; Wed, 01 Feb 2012 08:25:31 -0800 (PST) In-Reply-To: <1328108723.2595.33.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, Feb 1, 2012 at 10:05 AM, Eric Dumazet = wrote: > Le mercredi 01 f=E9vrier 2012 =E0 09:57 -0500, yao zhao a =E9crit : >> On Wed, Feb 1, 2012 at 9:50 AM, yao zhao = wrote: >> > >> > >> > On Wed, Feb 1, 2012 at 8:04 AM, Eric Dumazet wrote: >> >> >> >> Le mercredi 01 f=E9vrier 2012 =E0 11:24 +0000, Leonardo Uzcudun a= =E9crit : >> >> > ________________________________ >> >> > Da: Leonardo Uzcudun >> >> > A: "netdev@vger.kernel.org" >> >> > Inviato: Mercoled=EC 1 Febbraio 2012 12:22 >> >> > Oggetto: VLAN 1 - Native >> >> > >> >> > Hello: >> >> > >> >> > I'm connecting my Linux computer (debian 2.6.32-5) to a switch = to >> >> > implement vlans. >> >> > >> >> > All is working fine except for the VLAN 1. Of sure you are awar= e of >> >> > this situation and i would like to knoe if there is any paramet= er or >> >> > setting that i should set in the vlan (linux side, not switch) >> >> > configuration. Here's my configuration: >> >> > ip addr add 0.0.0.0 dev eth0 >> >> > ip link set eth0 up >> >> > ip link add link eth0 name eth0.1 type vlan id 1 >> >> > ip link add link eth0 name eth0.101 type vlan id 101 >> >> > ip addr add 0.0.0.0 dev eth0.1 >> >> > ip addr add 0.0.0.0 dev eth0.101 >> >> > ip link set eth0.101 up >> >> > ip link set eth0.1 up >> >> > brctl addbr br_vlan_1 >> >> > brctl addbr br_vlan_101 >> >> > brctl addif br_vlan_1 eth0.1 >> >> > brctl addif br_vlan_101 eth0.101 >> >> > ip addr add 0.0.0.0 dev br_vlan_1 >> >> > ip >> >> > addr add 0.0.0.0 dev br_vlan_101 >> >> > ip link set br_vlan_1 up >> >> > ip link set br_vlan_101 up >> >> > >> >> > Traffic on vlan 101 is working fine. Traffic on VLAN 1 is not w= orking >> >> > cause the packets are going out from eth0 like tagged. How coul= d i set >> >> > the VID 1 as untagged? >> >> >> >> What do you mean by "sending packets for VID 1, untagged " ? >> >> >> =A0on switch like Cisco: vlan 1 is the native vlan or default vlan s= o it is >> =A0untagged. untagged means packet has no vlan header. >> >> >> >> >> What is the difference between vlan 101 and vlan 1 ? >> >> =A0No other difference. Just because it is vlan 1 =A0which is specia= l in >> =A0switches(of course it can be changed on switch side but he doesn'= t want to) > > VID=3D1 is not the "known" native vlan at all, this is a vendor (stup= id ?) > extension. > That is true. But in IEEE standard it also said you can specify whether a vlan can be untagged or tagged on egress. > There is no ID reserved to untagged traffic in the 802.1Q specs, sinc= e > by definition, if traffic is untagged, there is _no_ VLAN tag in the > frame. > > Untagged traffic on linux is on eth0 itself (ingress or egress), not = on > eth0.xxx > If you want linux to do as a switch too, then you can have to make up something that what ERic said, use physical interface as the vlan 1, as it is untagged. When vlan 1 is not native vlan you have to change back to eth0.1. and change that new native vlan to physical interface. yao > > >