Return-Path: william@bourbon.usc.edu Delivery-Date: Thu Oct 30 14:10:55 2008 X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on merlot.usc.edu X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.2.3 Received: from bourbon.usc.edu (bourbon.usc.edu [128.125.9.75]) by merlot.usc.edu (8.14.1/8.14.1) with ESMTP id m9ULAt22007277 for ; Thu, 30 Oct 2008 14:10:55 -0700 Received: from bourbon.usc.edu (localhost.localdomain [127.0.0.1]) by bourbon.usc.edu (8.14.2/8.14.1) with ESMTP id m9ULMZ3J014852 for ; Thu, 30 Oct 2008 14:22:35 -0700 Message-Id: <200810302122.m9ULMZ3J014852@bourbon.usc.edu> To: cs551@merlot.usc.edu Subject: Re: CS551 Final1 Date: Thu, 30 Oct 2008 14:22:35 -0700 From: Bill Cheng Someone wrote: > Does a beacon node need to send check message when it loses > connection from one of its neighbors? Yes. Remember, the rule is that if you have sent HELLO, you need to send GOOD-BYE (i.e., NOTIFY). > If a beacon node's NoCheck=1 and a non-beacon node's NoCheck = 0, > the beacon node will ignore the check message, so it means that > the non-beacon node will think itself is not part of the network, > is it right? This will never happen during grading. Either NoCheck=0 for all nodes, or NoCheck=1 for all nodes. This is done so that your part (2) does not depend on part (1) *completely* working properly. > For Error Code of notify message, which value does timeout (Auto > shutdown) use? Please see: http://merlot.usc.edu/cs551-f08/msgs/bill/341.txt -- Bill Cheng // bill.cheng@usc.edu