| 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 |
A customer has just take delivery of DEFTA's, DEChub900's and concentrators. If port A of each DEFTA is connected to concentrator in HUB A. Works OK If port B of each DEFTA is connected to concentrator in HUB B. Works OK. But... with both A and B connected *red light flashes* on DEFTA indicating invalid topology. However, it continues to work OK. Any idea what's wrong? Thanks, Stuart.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1422.1 | Dual homing? | NPSS::MDLYONS | Michael D. Lyons - Young enough and dumb enough | Fri Aug 12 1994 11:51 | 4 |
It sounds like normal dual homing operation. If you connect a DAS
device to two M ports, the "A" port goes into standby, which is
indicated by alternating green/amber PHY LED. Is this what you are
doing/seeing?
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| 1422.2 | Documentation problem | NPSS::MDLYONS | Michael D. Lyons - Young enough and dumb enough | Fri Sep 02 1994 11:36 | 2 |
It has been pointed out to me that the DEFTA installation guide does
not document this LED behavior. This needs to be corrected.
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| 1422.3 | Dual homing requires connecting to a single ring | 40222::PETTENGILL | mulp | Fri Oct 28 1994 23:51 | 8 |
Unless the FDDI rings in hub A and B are connected together, the behavior described in .0 is expected. Dual homing is not dual path like CI. It is assumed that two concentrators are connected together via DAS ports providing a dual ring which will tolerate at least one failure. By connecting the DAS ports on an adapter to two different concentrators, the adapter will turn on port B and use it, but it expects to see itself on port A. If the ring connected to port B is not functioning, then it will activate port A and join the ring there. | |||||