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Conference azur::mcc

Title:DECmcc user notes file. Does not replace IPMT.
Notice:Use IPMT for problems. Newsletter location in note 6187
Moderator:TAEC::BEROUD
Created:Mon Aug 21 1989
Last Modified:Wed Jun 04 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6497
Total number of notes:27359

2987.0. "Unable to use station for DEBNT controllers." by STRASB::EBLE () Wed May 13 1992 10:01

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2987.1QAR number 404.STRASB::EBLETue May 19 1992 13:481
    
2987.2DEBNT vs Ethernet AM.CHRISB::BRIENENDECmcc LAN and SNMP Stuff...Thu May 21 1992 19:3731
When the user issues a SHOW STATION command to a station of type DEC_ENETV2,
the Ethernet AM uses the following MOP (wire) commands:

  SHOW ALL IDENT ---> MOPV3 Request ID (to verify existence)
  SHOW ALL CHAR ----> MOPV3 Request ID
  SHOW ALL STATUS --> MOPV3 Request ID *and* Request Counters
  SHOW ALL COUNT ---> MOPV3 Request Counters	

The DEBNTs we have on our local LAN appear to be responding to MOPV3
Request Counters with a packet 2-bytes larger than expected.

The Ethernet AM *should* be responding to this condition by:

1. Returning "Management Protocol Error" for SHOW ALL COUNTERS and
2. Returning the Request ID derived Status attributes for SHOW ALL STATUS
    (ignoring the bogus Counters packet).

The difference between what *should* be returned and what *is* returned
(also described in MCC_INTERNAL QAR #2996) was fixed in a later version
of X1.2.21 (a baselevel *after* T1.2.7).

We have not been able to duplicate the %MCC-E-INVPROTOCOL error for
the DEBNT (at least not without ALARM RULES enabled to the same
address as the SHOW request), but consistently get some other error
for the commands documented in this QAR.

We are currently analyzing exactly WHAT the DEBNT is returning in this
too-long packet and will post additional data when available (they may
be attempting to use the non-CSMA/CD form of MOP Counters response)...

						Chris Brienen