| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 487.1 | | QUIVER::SLAWRENCE | | Wed Nov 10 1993 15:31 | 22 |
| 1) You _can_ connect two hubs with a repeater-repeater cable, but if
you are going to create 6 LAN segments in each hub then you've only
connected the segments that those repeaters are on. At the risk of
repeating myself:
The DEChub 900 _does_not_ provide any interconnect between LANs on
the backplane.
2) Right now, if you create independant LANs on the backplane you must
do any interconnect between them outside the hub (we don't yet have a
bridge or router that can connect to anything on the backplane except
the DEChub90 Thinwire). The only benefit (without an external
bridge/router) of using the flexible Ethernet channels is that they
don't count as repeater hops.
As for bridging to the main backbone, what is the backbone? If you are
bridging each hub to the backbone anyway, why connect them directly?
Note: If you use the DECbridge 90 (any flavor) to connect the hubs to
the backbone, you _MAY_NOT_ connect the two hubs directly to each other
(doing so would violate the restrictions on DECbridge90 configuration).
|
| 487.2 | An example... | QUIVER::SLAWRENCE | | Wed Nov 10 1993 15:37 | 2 |
| See also 457.1 for an example configuration with many repeaters and 1
bridge.
|
| 487.3 | thanks so far | VAXRIO::ROLF | Vaporware Design Specialist | Wed Nov 10 1993 16:23 | 8 |
| Thanks -.1
Item 1 OK,
Item 2: I will have to re-think and re-formulate my question.
Thanks so far!
Rolf
|
| 487.4 | rethinking: | VAXRIO::ROLF | Vaporware Design Specialist | Thu Nov 11 1993 06:55 | 17 |
| Based on -.2/-.3 response, what I'd like to do is have say
three R900TMs and three B90FLs and somehow make each R900TM a separate
LAN, each connected via its own B90FL to a backbone to which all
B90FLs are connected.
I think this is not possible with the B90FL as it can only connect to
the ONE Thinwire on the backplane. Correct?
The multiport bridge which is somewhere in the future would be able to
do just that. Correct?
Or is there any other way to do it with presently available components
other than using a separate HUB900 for each LAN, of course?
Your help is greatly appreciated!
Rolf
|
| 487.5 | The modular solution... | QUIVER::SLAWRENCE | | Fri Nov 12 1993 08:35 | 41 |
| Much as it pains me as a hub person, the only way I can think of to
accomplish what you describe is to build it from standalone modules,
not hubs. Replicate the following as many times as you need:
+-----------+-----+ thinwire
|DEChub ONE |DECXM|------------T-
+-----------+-----+ |
| | +----------+
| Rptr900TM | |Bridge90FL|
+-----------+ +----------+
| | | | | | |
10baseT fiber to backbone
to systems
This isn't nearly as kludgy as it looks in ascii :-)
The DECrepeater900TM mounted in a DEChub ONE rack mounts nicely; the
back of the DEChub ONE has a notch in it like this:
+-----------------+
| AUI=
| +----+
| |
+----------------------+
| (900 module) |
The notch exactly fits the DECXM (I think I have that name right; I
mean the replacement for a DESTA that converts AUI to Thinwire).
The thinwire connection to the DECbridge90FL is on the flat upper
surface (and may be used _only_ when _not_ in a hub). This way the
repeater is on the Workgroup side of the bridge.
Note that you'll need a DECagent90 somewhere on the net in order to
manage the bridges; the DECrepeater900TM has its own agent.
--------
Yes, a configuration like you wanted to do is exactly what the
multiport bridge is meant to do... so when it comes out you could
replace all three 90 bridges and do all this in one 900 hub.
|