[Info-vax] hub better than switch?!

[Albrecht Schlosser]

On 07.03.2012 08:36, Phillip Helbig---undress to reply wrote:

>> I've lost track of what box/interface is configured with what
>> settings.
>
> It's an XP1000 but I don't know the settings.

Again, time for LANCP:

$ lancp sho dev ewa0 /params

NODE Device Characteristics EWA0 (7-MAR-2012 09:57:41.66):
                   Value  Characteristic
                   -----  --------------
..look here:
                     Yes  Full duplex enable
                     Yes  Full duplex operational
..and here:
             TwistedPair  Line media type
                    1000  Line speed (mbps)
                 Enabled  Auto-negotiation
                 Enabled  Flow control

This is from an Itanium Server, but should be similar on Alpha.

Since you're working with a non-manageable switch, Auto-negotiation
should probably be enabled on the Alpha. Otherwise the switch might
try to negotiate communication params from time to time, and this
might well be the cause of your errors.

And, as someone else said already, there ought to be no Carrier
Check Failures and no collisions at all (at least in Full Duplex
mode, as I assume). Here's what I get from the same Itanium:

$ lancp sho dev ewa0 /count

NODE Device Counters EWA0 (7-MAR-2012 10:06:41.06):
                   Value  Counter
                   -----  -------
                   55461 Seconds since last zeroed
                19045171 Bytes received
               224211073 Bytes sent
                  170535 Packets received
                  211662 Packets sent
                 3124700 Multicast bytes received
                   29442 Multicast bytes sent
                   41477 Multicast packets received
                     205 Multicast packets sent
                       0 Unrecognized unicast destination packets
                   19256 Unrecognized multicast destination packets
                       0 Unavailable station buffers
                       0 Unavailable user buffers
                       0 Alignment errors
                       0 Frame check errors
                       0 Frame size errors
                       0 Frame status errors
                       0 Frame length errors
                       0 Frame too long errors
                       0 Data overruns
                       0 Send data length errors
                       0 Receive data length errors
                       0 Transmit underrun errors
                       0 Transmit failures
                       0 Carrier check failures
                       0 Station failures
                       0 Initially deferred packets sent
                       0 Single collision packets sent
                       0 Multiple collision packets sent
                       0 Excessive collisions
                       0 Late collisions
                       0 Collision detect check failures
                       0 Link up transitions
                       0 Link down transitions
     2-MAR-2012 10:00:03 Time of last generic transmit error
                    None Time of last generic receive error

Albrecht