Troubleshooting guide

Automatic Packet Memory Scan (via sys-health-check)
Advanced System Diagnostics and Troubleshooting Guide 61
Automatic mode status is listed in the “sys-health-check” field of the display for the show switch
command.
When auto-recovery is configured, an automated background polling task checks every 20 seconds to
determine whether any fabric checksums have occurred. Three consecutive samples must be corrupted
for any module to invoke autoscan.
CAUTION
If automatic packet memory scanning is invoked—regardless of ‘i” series platform type or number of
errors—there is an initial period where the device is taken offline so that the scan can be run.
Memory Scanning and Memory Mapping Behavior
Memory scanning and memory mapping behavior differs depending on the “i” series switch platform,
whether you run the diagnostics manually or configure the auto-recovery option of the system health
checker, and the mode you configure (online or offline).
For BlackDiamond systems, once the test is initiated (either automatically or by manual control), the
memory scanning feature takes the selected module offline and initiates a thorough memory write/read
operation to detect any permanent single-bit errors in the memory of the module. This scan takes
approximately 90
seconds and the module remains offline for the duration of the scan.
For Summit “i” series and Alpine systems, the test is initiated by manual command, the entire switch is
taken offline during the time test is running and is then rebooted.
Table 6 describes the behavior of the switch if you configure auto-recovery using the
configure sys-health-check CLI command. The scan behavior differs based on the hardware
configuration, the mode selected (online or offline), and the number of errors to be detected.
Table 6: Auto-recovery memory scanning and memory mapping behavior
Platform
Online
Mode
Offline
Mode
New
Errors
Detected
Behavior
Alpine •
•
•
•
•
•
0
1-7
>7
0
1-7
>7
Switch kept online.
Errors mapped; switch kept online.
Errors not mapped; switch kept online.
Switch enters limited commands mode.
Errors mapped; switch kept online.
Errors not mapped; switch enters limited commands mode.
Summit “ i ” series •
•
•
•
•
•
0
1-7
>7
0
1-7
>7
Switch kept online.
Errors not mapped; switch kept online.
Errors not mapped; switch kept online.
Switch enters limited commands mode.
Errors mapped; switch kept online.
Errors not mapped; switch enters limited commands mode.
BlackDiamond with
one MSM64i (or
slave MSM64i is
offline)
•
•
•
•
•
•
0
1-7
>7
0
1-7
>7
Switch kept online.
Errors not mapped; switch kept online.
Errors not mapped; switch kept online.
Switch enters limited commands mode.
Errors mapped; switch kept online.
Errors not mapped; switch enters limited commands mode.