Stack failure due incorrect port connection

Publication Date:  2014-09-12 Views:  1257 Downloads:  0
Issue Description
Customer is trying to set up stack with 2XS57LI V200R001  using service interfaces. Unfortunately stack doesn't go up. 
Alarm Information
i was checking the logs:

Quidway ECM/3/LOGICAL_STACK_PORT_ILLEGAL:OID 1.3.6.1.4.1.2011.5.25.183.1.22.9 stack port GigabitEthernet1/0/27 connects with GigabitEthernet0/0/27, there are port member of the same logic stack port ID.
Handling Process
according to documentation the correct set up is this:
stackport1 (sw1) --- stackport2 (sw2), stackport2(sw1) --- stackport1 (sw2)

He should make cross connection.
Stack port1 of sw1 should connect to stack port 2of sw2, then stackport2 of sw1 should connect to port1 of sw2.
Stackport id should not be the same.
 
Root Cause
i've asked the customer about the cable connection, and he confirmed that he was using this:
stackport1 (sw1) --- stackport1 (sw2), stackport2(sw1) --- stackport2 (sw2)
Suggestions
He should make cross connection.
Stack port1 of sw1 should connect to stack port 2of sw2, then stackport2 of sw1 should connect to port1 of sw2.
Stackport id should not be the same.

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