From owner-freebsd-atm Wed Mar 1 12: 6:45 2000 Delivered-To: freebsd-atm@freebsd.org Received: from marcos.networkcs.com (marcos.networkcs.com [137.66.16.1]) by hub.freebsd.org (Postfix) with ESMTP id 4179B37B7DB for ; Wed, 1 Mar 2000 12:06:34 -0800 (PST) (envelope-from mks@us.networkcs.com) Received: from us.networkcs.com (us.networkcs.com [137.66.11.15]) by marcos.networkcs.com (8.9.3/8.9.3) with ESMTP id OAA23760; Wed, 1 Mar 2000 14:06:29 -0600 (CST) (envelope-from mks@us.networkcs.com) Received: (from mks@localhost) by us.networkcs.com (8.9.2/8.9.2) id OAA95134; Wed, 1 Mar 2000 14:06:28 -0600 (CST) (envelope-from mks) From: Mike Spengler Message-Id: <200003012006.OAA95134@us.networkcs.com> Subject: Re: Traffic shaping on HARP To: lamaster@nren.nasa.gov (Hugh LaMaster) Date: Wed, 1 Mar 2000 14:06:28 -0600 (CST) Cc: abe.hirofumi@lab.ntt.co.jp (Hirofumi ABE), kjc@csl.sony.co.jp (Kenjiro Cho), freebsd-atm@FreeBSD.ORG In-Reply-To: from "Hugh LaMaster" at Feb 29, 2000 06:13:17 PM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-atm@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Hugh LaMaster claims: > > > I can't decide which box is wrong BSD or cisco, but the MTU size of 9180 > > seems to have some problems. > > Cisco ATM MTU is 4470 by default; if you want 9180 you have > to state it explicitly. I believe that setting it to 9180 > can exacerbate problems with fast SRAM buffer exhaustion on > some configurations with lots of subinterfaces. POS also > defaults to 4470, though I believe that it can be set higher, > also to 9180, and the Cisco GigabitEthernet max MTU on some > new interfaces is 4470 (1500 on others), so, it seems that 4470 > is kind of a Cisco "standard". Do you need 9180 for a particular > reason or would 4470 do? (I think 9180 might be the Fore ATM > default? Does 9180 show up in an RFC somewhere?) > Yes. See RFC 2225, Section 7. -- Mike Spengler Network Computing Services, Inc. Email: mks@networkcs.com 1200 Washington Ave. So. Phone: +1 612 337 3557 Minneapolis MN 55415 FAX: +1 612 337 3400 (aka Minnesota Supercomputer Center) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-atm" in the body of the message