Path: utzoo!dciem!nrcaer!scs!spl1!laidbak!att!pacbell!ames!pasteur!ucbvax!GNOME.CS.CMU.EDU!Ravinder.Chandhok From: Ravinder.Chandhok@GNOME.CS.CMU.EDU (Rob Chandhok) Newsgroups: comp.protocols.appletalk Subject: Re: Do FastPaths isolate broadcasts? Message-ID: <849.581266019@GNOME.CS.CMU.EDU> Date: 2 Jun 88 14:46:59 GMT Article-I.D.: GNOME.849.581266019 References: <6139@well.UUCP> Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 21 >Jeff Meyer at Fluke asked whether K-boxes pass throught the burst >of packets that occur at startup time, thereby clogging up ethernet. The >burst of packets comes from the need to do a node address bid. These are >3-byte LAP packets that seek to ensure that no other device has the node >address that the newly-booted device intends to use. The node address >only has to be unique within the zone (defined by the K-box usually). >The Kinetics box does not need to pass on the packets and does not. >-- >Kurt VanderSluis Voice: (415) 849-2331 One more time, with feeling. The broadcast burst is LOCAL TO THE CABLE. It has nothing to do with zones, or nets, just node numbers. It is a LAP level braodcast, which does not get forwarded by the gateway (KBox). LAP only knows about node numbers, you need DDP to use a net number. In general, the "node address bid" is a local cable hardware broadcast, which is why there is a problem on Ethernet if you use something like a LanBridge and EtherTalk. Rob