[HECnet] FDDI advice

[Paul_Koning at Dell.com]

No, that would not be legal (and in fact the DEC FDDI chips contain specific machinery to detect and remove duplicate tokens should any show up).   Sridhar was talking about a switch (bridge), so each port is a separate LAN and as such has its own circulating token.

paul

On Oct 11, 2013, at 2:04 PM, Hans Vlems <hvlems at zonnet.nl<mailto:hvlems at zonnet.nl>> wrote:

Wouldn't that mean more than one token on a ring?

Van: Sridhar Ayengar
Verzonden: vrijdag 11 oktober 2013 19:55
Aan: hecnet at Update.UU.SE<mailto:hecnet at Update.UU.SE>
Beantwoorden: hecnet at Update.UU.SE<mailto:hecnet at Update.UU.SE>
Onderwerp: Re: [HECnet] FDDI advice


Paul_Koning at Dell.com<mailto:Paul_Koning at Dell.com> wrote:
Half duplex Ethernet slows down when there are collisions, but there
is no wait to transmit whenever the link is idle. With FDDI, there
is (you wait for the token). So at high load, half duplex Ethernet
might be a little slower than FDDI, but at modest load, it will
definitely be faster (lower latency).

But, doesn't the GIGAswitch get around that by generating a token for
each port? Isn't that how switched-FDDI works?

Peace... Sridhar