Extreme Networks ExtremeWare Version 7.8, Troubleshooting Manual

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34 Advanced System Diagnostics and Troubleshooting Guide
Packet Errors and Packet Error Detection
The intent of these messages is to alert the NOC that the health check error threshold is being exceeded.
Closer monitoring is required, but these errors do not necessarily point to a systematic problem.
These messages take the general format:
date time <level:from> Sys-health-check type checksum error cat data
Example:
<CRIT:SYST> Sys-health-check [EXT] checksum error (fast path)
on slot 2,prev=73 cur=82
where:
Checksum Error Messages:
This message appears in the log when packets received by the CPU are corrupted:
<Crit:KERN> Sys-health-check [CPU] checksum error (slow-path) on slot 7 701026-00-03
0003Y-00052
This message appears in the log when CPU Diagnostic packets received by the CPU are corrupted:
<Crit:SYST> Sys-health-check [DIAG] First 16 bytes of unknown pkt (slow-path) on
slot 7 701026-00-03 0003Y-00052
level The severity level, either CRIT or WARN.
• CRIT indicates a critical failure in the system that requires corrective action.
• WARN indicates that the error is most likely an isolated checksum occurrence and should
not be considered a critical failure to the system.
from The source of the message, from either SYST (system) or KERN (kernel).
type
The type of test packet involved, possibly pointing to the packet origin and the diagnostic
subsystem involved. Supported packet type descriptors are: CPU, DIAG, EDP, EXT, and INT.
• CPU, DIAG, and EDP refer to packets generated within the CPU health-checking
subsystem on the control (slow) path of the switch.
CPU packet types include DIAG and EDP packets, as well as data packets destined for
the CPU.
DIAG packet types refer to the CPU diagnostics packets generated by the health-checking
subsystem.
EDP packet types refer to the backplane health-checks used to test the communication
paths between the CPU and the I/O blades.
• EXT and INT packet types refer to a checksum that is appended to each and every packet
that enters (ingresses) and exits (egresses) the switch fabric MACs on the data (fast) path.
EXT refers to an external fabric checksum (external, user-facing MAC); INT refers to an
internal fabric checksum (internal, backplane-facing MAC).
(Extreme “ i” series switches pro-actively scan for fault conditions throughout the switch
architecture, and these packet types are all part of this effort. A checksum on one of these
packet types could have its root in packet memory, because all of these test packet types are
stored for a time in the packet memory. If the failure is within the packet memory and is
repeatable, run the packet memory scan to isolate and correct the failure.)
cat
The category—slow path counters vs. fast path counters—associated with the health check
error. This parameter indicates whether the window was marked bad due to fast-path reports
or slow-path reports.
data
Additional error information that summarizes the failure; content differs depending on the
associated type.