| Title: | DEChub/HUBwatch/PROBEwatch CONFERENCE |
| Notice: | Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7 |
| Moderator: | NETCAD::COLELLA DT |
| Created: | Wed Nov 13 1991 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 4455 |
| Total number of notes: | 16761 |
A simple question. Can we dual home across two dechubs Regards John
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3198.1 | NPSS::WADE | Network Systems Support | Wed Jan 24 1996 08:41 | 22 | |
Yes, if this is what you're asking -
HUB1 HUB2
DEF6X ------ ... ------ DEF6X (Could be a DEFHU)
M M
\ /
\ /
\ /
\ /
\ /
\ /
\ /
A B
DEFBA (Could be DEF6X or DEFHU)
Bill
| |||||
| 3198.2 | Thats the question | STROP::LAYLAND | Iligitami nil Carborundum | Wed Jan 24 1996 09:58 | 9 |
Hi Bill Yes that is correct. Although it looks simple somewhere in the past I believed that it was not supported. John | |||||
| 3198.3 | Dual hub design, home off each hub | PTOJJD::DANZAK | Pittsburgher � | Sun Jan 28 1996 10:41 | 35 |
I usually do something the the diagram below:
- Put an FDDI module in slot 8 (usually a DECswitch 900EF)
- Put an FDDI module in slot 7 (usually a concentrator)
- Connect the two FDDI modules across the backplane
- Ring them
- Dual home devices off of Hub 1 and Hub 2
Hub 1 Hub 2
Slot Slot
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
+----------------+--+--+ +----------------+--+--+
| -BP-FDDI-------++-+-A+-+ | -BP-FDDI-------++-+-A+--+
| || | B| | | || | B| |
| | | | | | | | | |
| || | | | | || | | |
| | | | | | | | | |
| || | | | | || | | |
| | | | | | | | | |
| || | | | | || | | |
| |B | | | | |B | | |
+----------------++-+--+ | +----------------++-+--+ |
| +----------------------------+ |
+-------------------------------------------+
The above can tolerate:
- Total failure of any hub
- Failure of any one hub module (and rest of hub modules are still
on ring/connected etc.
Hope that helps,
j
| |||||