From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from tuna.sandelman.ca (unknown [IPv6:2607:f0b0:f:3:216:3eff:fe7c:d1f3]) by huchra.bufferbloat.net (Postfix) with ESMTP id F226521F0FA for ; Thu, 21 Mar 2013 07:53:20 -0700 (PDT) Received: from sandelman.ca (unknown [IPv6:2607:f0b0:f:2::247]) by tuna.sandelman.ca (Postfix) with ESMTP id 415B82016D for ; Thu, 21 Mar 2013 11:01:49 -0400 (EDT) Received: by sandelman.ca (Postfix, from userid 179) id 6164B63860; Thu, 21 Mar 2013 10:53:12 -0400 (EDT) Received: from sandelman.ca (localhost [127.0.0.1]) by sandelman.ca (Postfix) with ESMTP id 5409F63827 for ; Thu, 21 Mar 2013 10:53:12 -0400 (EDT) From: Michael Richardson To: bloat@lists.bufferbloat.net X-Mailer: MH-E 8.3; nmh 1.3; XEmacs 21.4 (patch 22) X-Face: $\n1pF)h^`}$H>Hk{L"x@)JS7<%Az}5RyS@k9X%29-lHB$Ti.V>2bi.~ehC0; <'$9xN5Ub# z!G,p`nR&p7Fz@^UXIn156S8.~^@MJ*mMsD7=QFeq%AL4m Sender: mcr@sandelman.ca Subject: [Bloat] other people's VLAN congestion X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Mar 2013 14:53:21 -0000 --=-=-= Content-Transfer-Encoding: quoted-printable This is for the page where we list places that you may have bufferbloat and be unable to see it. I think that there is a place in the wiki, but I have to locate it, and I started writing this offline. Many owners of (managed) fiber sell NNI to Access Port "LAN Extension" services. Typically there is a 1GB/s ethernet NNI in the data center, and a VLAN is assigned to travel to a 10Mb/s or 100Mb/s port at each site. The consumer of this service is usually (Boutique) ISPs, but also larger enterprises. Without oversubscribing the NNI, the provider of the fiber may have oversubscribed the service, and this can cause queues to develop inside of this layer-2 network. Even without oversubscription in the provider network, instantaenous bursts can sometimes cause significant jitter and buffer consumption.=20=20 These buffers may have nothing to do with the consumer's traffic. Addition of buffers here reduces the drop probability therefore appears to the provider to be a good idea. =2D-=20 ] Never tell me the odds! | ipv6 mesh network= s [=20 ] Michael Richardson, Sandelman Software Works | network architect= [=20 ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails = [=20 =09 --=-=-= Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQCVAwUAUUse2IqHRg3pndX9AQLwIQP+LDyahE3vc9xXZiY4b+G8SGl/vLYcpBFk qNJ/yM7g8Fru5LnRtU+5l4Q2ykBPN1n5y1PezlGDscmFWQ0CTY1igGPVJGNDd4q2 t9losh9k3yUS4TVnZixzawdh7IB6NsbwuUx8ss3B8EW1YL7evXGZAcREym3f0HCN wa26N7QECJk= =3ZOy -----END PGP SIGNATURE----- --=-=-=--