| 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 |
Hello, again.
Two more questions:
1. Regarding a ring of "bounded" SAS to SAS configuration (for
example, DECcontroller 400 to another DECcontroller 400 without
DAC), Paul Koning answered "yes" in the Note 107.1.
My question is:
a. Is this a standard FDDI configuration?
b. Does Digital support this?
In this scenario, I will assume that the receiving wire (fiber) of one
node goes to the sending wire (fiber) line of another node. In other
words, wire crossing.
2. My customer is thinking about configuration DECbridges 500/600
A/B ports to support totally two different rings (not for
counter rotating redundant rings).
Do we support 2 MACs on the the FDDI A/B card?
Thanks.
John
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 766.1 | KONING::KONING | Paul Koning, A-13683 | Fri Oct 30 1992 18:50 | 19 | |
1. This has been answered already, but in any case... a. yes b. yes (except on copper, due to physical layer limitations) 2. It's not entirely clear what the configuration is. "Totally separate rings" is not possible; the FDDI standard doesn't permit that. The fiber pair for a port always has to go to another port, it can't be split. The A and B port are always part of the same LAN, though the data may not flow from one to the other all the time. If you're referring to the ability to carry data on the secondary ring of the FDDI dual ring trunk, that's a valid FDDI feature, but we do not support it. (I think there may be one or two products in the industry that do, but it's quite unusual. Judging by what's actually implemented, the industry consensus is that there is no point in doing a Dual MAC DAS. Never mind that there was an enourmous amount of fuss about it in the past...) paul | |||||