From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1AB54C2BA17 for ; Sun, 5 Apr 2020 13:50:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEB8520672 for ; Sun, 5 Apr 2020 13:50:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Rz+6lVjT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726949AbgDENuI (ORCPT ); Sun, 5 Apr 2020 09:50:08 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:38407 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726636AbgDENuG (ORCPT ); Sun, 5 Apr 2020 09:50:06 -0400 Received: by mail-wm1-f67.google.com with SMTP id f20so3902393wmh.3 for ; Sun, 05 Apr 2020 06:50:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references:reply-to :mime-version:content-transfer-encoding; bh=aBPW0ikbvridXXEyZFzXqY5ifC1XaKtdSC74aEjA+go=; b=Rz+6lVjT71sn/yFlmE5QJc2xkxIys4L1C2rba3kkfkWd5m39D95p5YGxDO8UPjIUam ZG9+UYKyhNPG9jP/QrzhhNyGd57vnIbHDuTtOq5+HvV0R3nhszBMYVT41NI//iC0CvkP ePM2YOTnPTxp/i360+egSXzOdXAmdEJc7mOw9YWG5phKCWfdsH8dYjK2jkf2JDI6Hsfj jtztv3p/WHf7pmNkl6PS9UcyPe5LvstexgugPutxhJxPyUMaxr/6Ladlq7UkG9Or6+VJ FAiaJN4/ikDKPd0oRGQdXc31aBwGJ7w4mSZDhnWm0RQNfjPvZxoNuwugOXxMuwna5hfd CUug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:reply-to:mime-version:content-transfer-encoding; bh=aBPW0ikbvridXXEyZFzXqY5ifC1XaKtdSC74aEjA+go=; b=iZF8ALxsTPAlJyGz3uNhro1EnimAWZzF0TmmTZTqYiiCTxxPhet8654eojN7JgvGIL 2eqv/MKIe9XN2z/WSvwLDM/JBggmrY8JdEDQxUM3YqwbIk9O4VNwumk/2ZWlCef0vSZ1 jZzqZ91ttcFmIxmSEEkbR5oh1IxV0Yh+Cb6p0Utnqdsb3E/rMGdJHldMlJ4jnra9vG/L sWkpJkjsbn0E3qUHZKY0+eriIIydWinlaepDQuQRrlpBASpgs6aiPBIWISzjmTkh9yG4 mvAPQsDiBfm+gYWMAitnaf2epVjEyIvygMtQOqHUxZNAr3tm8Wkv0MajbPNw+VM5hQ1j eObw== X-Gm-Message-State: AGi0PubU/wtil6c6vrIbhi3x8HQSO4l+ynsz1hwzzNO6Whb92BnhxX19 3kIH0ddUmXGQn4ZnIlIjOSxY/XBy X-Google-Smtp-Source: APiQypKRssPVM5sfrLU2cAVCYqu7B4Nr7mTmH//+Q0WvwgYbdoxQYuY0gonDJmf5U5uc6aBVudgZ8Q== X-Received: by 2002:a1c:b144:: with SMTP id a65mr19059263wmf.54.1586094603810; Sun, 05 Apr 2020 06:50:03 -0700 (PDT) Received: from localhost ([2a01:e35:2f01:a61:fc49:14b:88c:2a9c]) by smtp.gmail.com with ESMTPSA id o9sm21056126wrx.48.2020.04.05.06.50.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Apr 2020 06:50:02 -0700 (PDT) From: "=?UTF-8?q?Bastien=20Roucari=C3=A8s?=" X-Google-Original-From: =?UTF-8?q?Bastien=20Roucari=C3=A8s?= To: netdev@vger.kernel.org Cc: =?UTF-8?q?Bastien=20Roucari=C3=A8s?= Subject: [PATCH iproute2 4/6] Better documentation of BDPU guard Date: Sun, 5 Apr 2020 15:48:56 +0200 Message-Id: <20200405134859.57232-5-rouca@debian.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200405134859.57232-1-rouca@debian.org> References: <20200405134859.57232-1-rouca@debian.org> Reply-To: rouca@debian.org MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Document that guard disable the port and how to reenable it Signed-off-by: Bastien Roucariès --- man/man8/bridge.8 | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/man/man8/bridge.8 b/man/man8/bridge.8 index c8e15416..53aebb60 100644 --- a/man/man8/bridge.8 +++ b/man/man8/bridge.8 @@ -340,7 +340,18 @@ STP BPDUs. .BR "guard on " or " guard off " Controls whether STP BPDUs will be processed by the bridge port. By default, the flag is turned off allowed BPDU processing. Turning this flag on will -cause the port to stop processing STP BPDUs. +disables +the bridge port if a STP BPDU packet is received. + +If running Spanning Tree on bridge, hostile devices on the network +may send BPDU on a port and cause network failure. Setting +.B guard on +will detect and stop this by disabling the port. +The port will be restarted if link is brought down, or +removed and reattached. For example if guard is enable on +eth0: + +.B ip link set dev eth0 down; ip link set dev eth0 up .TP .BR "hairpin on " or " hairpin off " -- 2.25.1