>-----Original Message----- >From: ietf-bounces@xxxxxxxx [mailto:ietf-bounces@xxxxxxxx] On Behalf Of Lars >Eggert >Sent: Tuesday, April 14, 2009 8:16 AM >To: Ole Jacobsen >Cc: IETF discussion list >Subject: Re: Your "favorite" network faults > >Daisy-chaining a small number of hubs also causes interesting issues. >Doesn't happen much anymore, now that switches have become prevalent. Exactly, was replaced with daisy-chaining large numbers of switches (where large == "more than 7 or so") :) >On 2009-4-13, at 4:49, Ole Jacobsen wrote: >> OK, I'll chime in: I got one of those key-chain sized Ethernet >> loopback connectors. The idea is that you attach one end to a patch >> cable and the other to the hub and if all is well the link light goes >> on on the hub. So, I am sitting there admiring this wonder when all my >> telnet sessions (OK, maybe SSH sessions) go away, webpages won't load >> and AIM/Jabber disconnects. Of course the loopback device is causing a >> broadcast storm and the hub isn't working well. >> >> This supposedly does not happen on a switch... I haven't bothered to >> try. Actually, I am not sure a switch would be immune ... broadcast (and multicast, sans snooping) still gets flooded ... (IIRC it also triggers bpdu-guard to disable the ports, if the config is just right (or just wrong)). /TJ _______________________________________________ Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf