| 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 |
I can't find any problems with these fault tolerant fddi configurations
for an important Korean tender. Maybe some gurus can look these over.
The Lans are mixed DECnet (IV i think) and TCP with the VAXclusters as
shown
fig 1.
=====DC500===========DC500======= FDDI DUAL RING/6-PORT CARD
|| \\ // ||
p || \\ s s // || p FDDI SAS CONFIGURATION
|| ===========|| || for AUTO BACKUP LINK
|| ==========// || || & LOAD BALANCING by
|| || || || H/W or S/W
|| || || ||
VAX7610 VAX7610 VAX CLUSTER SYSTEM
| |
-------S008-------
/ \
p:primary link
s:secondary link
fig 2.
=====NIS600==========NIS600======= FDDI DUAL RING/LAN CTRL 602
| \ / |
p | \ s s / | p AUI CABLE & H4005
| ------------ | for LOAD BALANCING
| ---------/ | | & AUTO BACKUP LINK
| | | | by H/W or S/W
| | | |
++++++++++ ++++++++++ ETHERNET THICK CABLE
(PRIMARY SEGMENT) (SECONDARY SEGMENT)
p:primary link
s:secondary link
fig 3.
========== ++++++++++++++++++++++ ETHERNET THICK CABLE
F || p | | p p | (PRIMARY SEGMENT)
D || | | |
D || ------- | |
I || | VAX VAX VAX CLUSTER SYSTEM
NIS600 7610 7610
R || | | \ | \
I || -------| | --------S008--
N || | | | \
G || s | | s s |
========== ++++++++++++++++++++++ ETHERNET THICK CABLE
(SECONDARY SEGMENT)
AUTO BACKUP LINK & LOAD BALANCING
by H/W or S/W
p:primary link
s:secondary link
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1176.1 | KONING::KONING | Paul Koning, B-16504 | Thu Dec 09 1993 11:18 | 16 | |
From the FDDI point of view those configurations look fine. For the higher layer protocols, you need to confirm that either (a) you can have multiple adapters active on the same extended LAN, or (b) only one adapter is being used for that protocol. For example, with DECnet Phase IV (or Phase V when using Phase IV compatible addressing) you can only use one adapter per extended LAN. If you want to use multiple adapters, the node has to be a router and the adapters have to connect to separate LANs that are NOT bridged. They can be connected via a router. For example, figure 3 would work. With Phase V when Phase IV compatibility is NOT turned on for the LANs, you can have multiple adapters on the same extended LAN with no restrictions. paul | |||||