| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
We have a DEMFA on a FDDI ring connected to a Proteon Router. There
are messages on the FDDI ring and Proteon has requested the customer
to check with us regarding void frames. They would like to know how
our viod frame are formatted, and any other information on how we
utilize the void frames.
We sincrerely hope someone will be able to update us, or give us a
pointer in the documentations.
Thank You,
eng soon
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1251.1 | CSC32::B_GOODWIN | MCI Mission Critical Support Team | Tue Mar 01 1994 08:56 | 3 | |
You should search this conference. There are many notes talking about
void frames.
| |||||
| 1251.2 | Some info on void frames | LEVERS::B_CRONIN | Wed Mar 02 1994 08:51 | 17 | |
First, void frames are 17 bytes long, which includes FC, DA, SA and FCS
fields. They can be thought of as frames with no information (i.e. a
zero length information field).
Digital uses voids when the MAC is in "bridge strip" mode, and also
when running the ring purging algorithm. If you hook up an FDDI
monitor and see one void at the end of a series of frames, its from
a station utilizing bridge stripping. If you see two back to back voids,
then they are from the elected purger.
Proteon's CNX500 also uses void frames when it's MAC chip is in a
bridging mode, and also for a latency measuring algorithm (if my
memory serves me correctly). So, don't assume that all void frames
come from Digital FDDI boxes if you see them on the ring.
At the risk of opening a can of worms, is there a problem here, or are
people just looking for info on void frames?
| |||||