| 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 a cutomer who has a number of 900MX bridges. Recently he has started seeing a large number (5000 per million packets) of short packets (9-10 bytes) appearing on a segment attached to a 900MX. The short packets have part of the destination address and either F's or 5's. The customer idn't blaming the 900MX yet but I said I would follow it up. Has anyone seen this behaviour from the 900MX. Any help or suggestions appreciated. Murray
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1440.1 | Looks like "Remote Failure to Defer" | MSDOA::REED | John Reed @CBO, DTN:367-6463, KB4FFE, SouthEast | Mon Sep 19 1994 11:26 | 18 |
I have found, that Packets that get their destination address stepped
on are typically "late collisions", which is the result of a
mis-configured network.
You might check the distance of all the media in that collision domain,
and how many repeaters are between the two furthest points in the
collision domain (5-4-3 rule).
In your base note, you comment that the customer has a number of bridges,
and only recently has he seen this change occur on one port. Then I
would check to see what device was last added to that segment. It may
be a PC that is having trouble detecting carrier presence, or a cable
that got caught under a desk, or rolled over by a chair once too many
times.
Late Collisions are really hard to find. Good Luck.
JR
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| 1440.2 | NETCAD::ANIL | Mon Sep 19 1994 23:22 | 7 | ||
Check the Ethernet port screen (new on the currently released
HUBwatch version). You get to it by double-clicking on the icon
of the port on the summary window. I would look for Ethernet errors
on the port connected to the problematic LAN, and also the
port-restarts counter.
Anil
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