| 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 |
I have one port on a DECbridge 900MX V1.5 which keeps restarting
2-3 times per day. Frequently the bridge also records a forward
transition. However it is not one to one. The errorlog contains no
entries.
What causes the port to restart?
Scott
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2836.1 | Absence of traffic will result in a port restart | NETCAD::BATTERSBY | Thu Oct 05 1995 15:21 | 15 | |
Scott, Which port is it that is "restarting"? Is it one of the
UTP ports or one of the 2 AUI ports.
A flakey MAU could cause the port to leave the forwarding state
& restart as you call it, as well as a flakey cable.
Basically when a port sees no active traffic on the LAN it is/was
connected to, it will drop out of the forwarding state and then
restart the pre-forwarding, learning, and then back to forwarding
process.
Other possibilities are that the port that occasionally restarts
is detecting a loop that comes and goes (a parallel connection that
perhaps some user on another bridged LAN may use infrequently during
the day), by plugging & un-plugging a cable elswhere.
Bob
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| 2836.2 | KAOFS::S_HYNDMAN | Ride life's curves | Thu Oct 05 1995 16:34 | 16 | |
Bob,
Thanks for the quick reply. The port in question is port 7 which
is the bottom AUI port.
The port counters from Hubwatch are showing the port restarts
counter and forwarding transitions incrementing. I don't think I have a
bridging loop but a bad mau or cable is a possibility.
Is it possible to have a hardware problem on this one port on the
switch? Would a hardware problem on the switch have to be logged in
the error log?
Scott
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| 2836.3 | Some more suggestions to try..... | NETCAD::BATTERSBY | Thu Oct 05 1995 18:50 | 12 | |
Well there's always the possibility of a flakey solder connection
at the AUI connector, transformer, etch, LANCE Chip for the receive path
for port 7. One way to verify this would be to change your LAN
connection to the other AUI port (if it's currently unused), then on
port 7 put an AUI loopback. Then keep tabs on port 7 to see if
there are any restarts on port 7. Also now that you are using the
other AUI port (port 2), if the problem is in fact a flakey MAU,
the problem should move to port 2. So by doing the above steps
you should be able to pin down whether the problem is internal to
port 7 or whether it is related to a bad MAU or cable.
Bob
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