| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2687.1 | | NETCAD::DOODY | Michael Doody | Mon Aug 28 1995 21:12 | 12 |
| You're using v4.0 of the MAM and Hubwatch, right?
When you say "result is no connection", do you mean the front-panel
S port or the internal M port? Any error message? what are you
connecting?
If internal, are you connecting the 900EF to another module that is
configured to have (at least) an internl S port?
It should work.
-Mike
|
| 2687.2 | Need more information on your FDDI config... | NETCAD::BATTERSBY | | Mon Aug 28 1995 21:16 | 9 |
| Can you be more specific and tell us what you are trying to connect
the M port to and what you are trying to connect the S port to?
IE: what kind of devices are you tring to establish a connection to
on both the M & S ports respectively?
What does the backplane ring consist of that you are trying to
connect the M port to?
What external device are you trying to connect the S port to?
Bob
|
| 2687.3 | No connection if there is no other device | GIDDAY::STANISLAUS | | Mon Aug 28 1995 23:30 | 9 |
|
Re .0, I have noticed that if you create an FDDI LAN on the backplane
and connect only one device to it, (for example an M port of a DEcswitch 900EF)
and there is no counterpart (i.e. S port of another device) connection to the
same FDDI flexi-channel, then when you come back into LANINTERCONNECT window you
do not see the connection to the FDDI channel you just made. I think that is
normal.
Alphonse
|
| 2687.4 | multpile DECh | DIVRDN::GELOTTI | Rick | Tue Aug 29 1995 12:17 | 31 |
|
OK, what I am trying to accomplish is an
external/internal FDDI connection utilizing the
DECswitch 900.
My scenario is such that I have multiple DEChub
900's each with DECswitch 900EF's and
DECconcentrator 900MX's. I need to connect all
(5) hubs together in a star topology with
single fiber runs originating from a central
Hub900. In order to do this and keep both
internal (backplane) and external connections,
I was hoping to use the new capabilities of the
DECswitch (firmware v1.5) where the ports can
be configured as M/S, as opposed to just A/B.
That way I could connect the external "S" port
of the Central hub switch to the "M" port of
one of the end point hub's concentrator. And,
the internal "M" port of the central hub switch
could connect to the internal ring on the
backplane (with the coexisting concentrator).
What's wrong with my config?
re: .1 - "no connection" is defined as no
visual lights on to indicate a connection.
Also, when I attempt to configure in this
manner, HUBwatch does not allow me to connect
the internal port ("M") of the DECswitch to the
backplane LAN.
|
| 2687.5 | | NETCAD::DOODY | Michael Doody | Tue Aug 29 1995 13:54 | 82 |
| It's easier to describe with a picture, I think. You have described
an arrangement with a central hub and remote hubs. You need a star
configuration because of the geography. You are proposing to configure
the central hub with S ports out the front which will connect to a
front panel M port on each remote hub.
Here is a LIGO building block picture of the central hub. Note that
I have left off the concentrator front panel M ports (because
they cannot be changed). Since you have 4 remote hubs you need 4
front panel S ports:
front panel ports
S S S S
| | | |
+--------+ +------+-+ +-+---+-+ +-+------+
| slot 1 | | slot 2 | | slot 3| | slot 4 |
| switch?| | switch?| | conc ?| | conc ? |
+-+----+-+ +-+------+ +-------+ +------+-+
| | | |
M M M M
Backplane Ports
There are 2 problems. The only backplane ports you have are M ports.
M ports cannot be connected to each other. Even if Hubwatch did not
enforce the rules, the FDDI connection policy would not allow it.
Also, to connect modules together on the backplane, the middle
modules need 2 ports on the backplane - 1 port to connect upstream and
1 port to connect downstream.
I suggest that you use front panel M ports in the central hub to
connect to the remote hubs. That's what they are there for in the
concentrators. This is what the building blocks could look like
as an example for the central hub:
Front Panel Ports
M M M M M M
| | | | | |
+-+-+-+-+-+-+-+ +-------------+ +-------------+
| CON #1 | | SWITCH #1 | | SWITCH #2 |
+-+---------+-+ +-+---------+-+ +-+---------+-+
| | | | | |
| +-------------+ +-------------+ |
| B A B A |
+---------------------------------------------------------+
A Backplane Ports B
This is from diagram #25 in the FDDI configuration note #2340.
In this example, there is an internal dual ring in the central hub
and the remote hubs will connect to the M ports on the concentrator.
This will work if you are not connecting the central hub to some
other ring etc. (There are other configurations that will work).
For this example, here is what the remote hubs would look like:
S M M M M M
| | | | | |
+-+-+-+-+-+-+-+ +-------------+ +-------------+
| CON #1 | | SWITCH #1 | | SWITCH #2 |
+-+---------+-+ +-+---------+-+ +-+-----------+
| | | | |
+-------------+ +-------------+ |
M S M S M (n/c)
The two switches in this example have no front panel FDDI ports
enabled. They are both configured M,S out the back. The concentrator
is configured as S out the front, M out the back. Alternately, you
could configure a switch with S out the front, M out the back, then
the concentrator would have to be M,S both out the back. You'd get
an extra front panel M port that way.
You should read the FDDI configuration guide in note #2340 if you
haven't already. Hope this helps.
-Mike
|
| 2687.6 | RE .3: single FDDI connections are lost | NETCAD::MOWER | | Tue Aug 29 1995 15:28 | 17 |
|
RE .3
> ...I have noticed that if you create an FDDI LAN on the backplane
> and connect only one device to it ... when you come back into
> LANINTERCONNECT window you do not see the connection to the FDDI
> channel you just made. I think that is normal.
Correct, that is normal behavior.
Since FDDI is point-to-point, and since neither HUBwatch nor the MAM
remembers "single", ("virtual"), FDDI connections, those connections
are lost when the LAN interconnect view is exited.
Carl Mower
HUBwatch LAN interconnect
|
| 2687.7 | Got it... | DIVRDN::GELOTTI | Rick | Wed Aug 30 1995 14:53 | 42 |
|
Thanks for all the inputs. I got a copy of the
FDDI config rules and came up with a solution. I will
try to verbalize rather than draw figures since it
takes less time.
All 5 hubs contain following:
DECcontrator 900MX
DECswitch 900EF
For each hub, I config'd as follows:
EXTERNAL connects +----------+ BACKPLANE connects
----------------------| |---------------------
CENTRAL Hub: | |
none DECswitch 900EF "A/B"
all "M's" DECconcentrator 900MX "A/B"
| |
4 REMOTE Hubs: | |
"S" DECswitch 900EF "M"
all "M's" DECconcentrator 900MX "M/S"
| |
| |
+----------+
So, my Central hub has a DUAL Ring config in
the backplane. And, my Remote hubs are configured as
trees in the backplane with "M" "S" connections
between Concentrator and Switch.
My connections to the remote hubs are from the
"M" ports of the Central concentrator to the "S" ports
of the Remote Hub Switches. So the remote hubs are
trees off the Central hub.
BTW, all this required the latest firmware for
the Switches (v1.5.0) and Concentrators (v3.0.1).
Thanks again,
Rick
|
| 2687.8 | one change to your proposed configuration | NETCAD::MOWER | | Wed Aug 30 1995 15:48 | 60 |
|
I have translated your proposed configuration into a diagram.
I see only one necessary change: the backplane ports of the two
modules in the central hub should each be set to "-/AB" (both A & B
on the backplane), so the two modules will be connected via a dual
ring on the backplane.
.----------------------.
FOR THE CENTRAL HUB: | |
| |
M M M M |
---+--------------------+--------------------+--- |
| switch 900EF | conc. 900MX | |
... | | | ... |
| (ligo= F:-, BP:AB) | (ligo: F:-, BP:AB) | |
---+--------------------+--------------------+--- |
AB AB |
|| || |
++===================++ |
|
|
|
.-----------------------------------'
REPEAT FOR EACH |
OF THE 4 REMOTE |
HUBS: |
|
M S M M M M
---+--------------------+--------------------+---
| switch 900EF | conc. 900MX |
... | | | ...
| (ligo: F:M, BP:S) | (ligo: F:S, BP:M) |
---+--------------------+--------------------+---
S M
| |
+-----------+
|
|
OR, ALTERNATIVELY: .-----------------------------------------------'
REPEAT FOR EACH |
OF THE 4 REMOTE |
HUBS: |
|
S M M M M M
---+--------------------+--------------------+---
| switch 900EF | conc. 900MX |
... | | | ...
| (ligo: F:S, BP:M) | (ligo: F:M, BP:S) |
---+--------------------+--------------------+---
M S
| |
+-----------+
|
| 2687.9 | Yes, colapsed dual and "S" ports on switch | DIVRDN::GELOTTI | Rick | Wed Sep 06 1995 12:30 | 7 |
|
Thanks for the info. I have implemented the
dual ring in the backplane as well as the
"S" port connect to the remote switch. This
leaves me all concentrator ports available.
Rick
|