| 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 |
We upgraded the firmware of a production DEChub 900. The hub did a
reset/reboot and came up with the new FIRMWARE. The hub had
DECrepeater 900TMs in it and DECswitch 900EFs going to an FDDI
backbone.
ALL ETHERNET SNA TRAFFIC was dropped at the reboot.
SNA traffic over Ethernet is VERY time sensitive (worse than LAT) and
at the SLIGHTEST burp dies.
I understood that hub manager reboots would NOT drop/effect modules. Am
I wrong? What'd the deal?
Thank!
j
^--who rebooted CompUserve's production hubs with no bad FDDI stuff
apparently....(grin)
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 2630.1 | NETCAD::DOODY | Michael Doody | Fri Aug 11 1995 18:32 | 11 | |
I'm not sure why you thought that. I think you got lucky with the
Compuserve FDDI...
The MAM will optimize the channel assignments at boot-time. If they
were optimal already it won't go disconnecting things. But sometimes it
will make the backplane ports go through a disconnect/reconnect cycle,
should be around 1.5 seconds duration max. We'll be looking at this in
the coming months to see if we can be more connection-friendly... this
would be for V5 MAM.
-Mike
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| 2630.2 | Please quantify ...? | PTOJJD::DANZAK | Pittsburgher � | Sat Aug 12 1995 01:26 | 21 |
Why I thought that.....?
Because we were told that the MAM was not actively engaged in
connection management and, that if it died, the hub would continue in
operation without any interruption. Only new modules could not be
inserted and power management could not be done (i.e. if things died
etc.)
The analogy that I used to describe this to customers is that it's like
a switchboard operator, establishing a connection and then remaining
passive during the conversation...and if the operator goes out for a
bio break - the connections remain.
So, exactly what is the failure mode of the MAM and how can we
accurately describe it to customers? I've upgraded MANY customers hubs
while in operation with no ill effects.....we need to understand the
parameters to describe/sell it accurately.
Regards,
j
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