From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen@networkplumber.org>
Subject: Re: network interfaces called "all", "default" or "config"
Date: Thu, 14 Aug 2014 11:28:58 -0700
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Cc: Randy Dunlap <rdunlap@infradead.org>, linux-kernel@vger.kernel.org,
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To: Stephane Chazelas <stephane.chazelas@gmail.com>
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On Thu, 14 Aug 2014 10:41:39 +0100
Stephane Chazelas <stephane.chazelas@gmail.com> wrote:

> $ ip link add link eth0 eth0:123 type vlan id 123
> $ ip link del link eth0 eth0:123
> RTNETLINK answers: Operation not supported

eth0:123 is one of the old style interface names.
Kernel and iproute treat these specially.
Don't use them. They exist only for compatibility with the
dark ages.

You should use period (ie eth0.123) for VLAN's