| 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 customer reports that on 2 of his 5 dh900s, some flex channels appear
to quit working if the hub is powered off and on.
dh900ms - 4.1.0
ds900ef - 1.5.2
dr900tm - 2.0.0 ! each repeater is on a separate lan segment
dr900tm - 2.0.0 ! and not the backplane thinwire
dr900tm - 2.0.0
dr900tm - 2.0.0
dr900tm - 2.0.0
If hub is power cycled, the port counters on the 900ef show
bytes sent, but 0 bytes received. This usually happens on one
or two of the flex channels, but NOT all of them and not always
the same ones. (Side point - I can't find any way to look at
the counters on the dr900tm flex channel port??)
The customer had not done a "reset w/ current" on either the hub
or the 900ef, so I asked him to try that tonight. He won't be a
happy camper if he has to do this after every power failure.
Any thoughts, ideas, workarounds? Is the problem more likely with
the 900ef than the flex channels?
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3655.1 | NETCAD::DOODY | Michael Doody | Wed Jun 26 1996 10:57 | 32 | |
I think you mean it happens on one or two of the LANs. You can't see
the flex channels. Also, by "flexchannels quit working" I take that to
mean that some of the repeaters don't see traffic from the switch. I
think this will help readers understand the problem statement.
I assume the LEDs on the switch show that all ports are forwarding
packets and that you have no loops causing switch ports to go into
standby. Also, I assume when you do a "refresh" on the Lan Interconnect
window in Hubwatch that all the connections are still shown to exist
correctly.
It could be a hardware problem. One or more of the modules may have a
bad backplane driver that is affecting communication between the switch
and a repeater. Or possibly the backplane is bad.
Look for errors on the affected ports (though its not always necessary).
My guess is that it is a bad module, rather than the backplane.
Maybe a LAN gets assigned a different flexchannel each time the hub
reboots (this can certainly happen), so the problem seems to move from
one LAN to another, whichever LAN happens to get the problem channel.
> (Side point - I can't find any way to look at
> the counters on the dr900tm flex channel port??)
Double-click the repeater. Scroll down the port list to the bottom
where there is a port labelled "BP" (backplane). Click the picture
of the BNC connector.
-Mike
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