Monitoring I2C Failures On Management Modules - Brocade Communications Systems MLX Series Installation Manual

Managing the device
NOTE
There is a 10 second delay between the power-off lp command and the power-on lp command. Wait 10 seconds between
commands.

Monitoring I2C failures on management modules

The management module accesses temperature sensors, fan controllers, power supplies, serial PROMs, and other devices are all
accessed through the I2C serial bus. When I2C devices are inaccessible, generic (and uninformative) error messages are displayed on the
management module console interface. If you do not keep a record of the console messages before the management module resets or
reloads, these error messages will be lost.
At the first occurrence of an I2C failure, the Global I2C Error Indicator (GIEI) flag severity is set to major. The GIEI flag is cleared only when
the management module is able to access the same physical device successfully. The GIEI severity flag is set to minor only if other I2C
devices are accessible. A set of static and dynamic Syslog messages are generated when any or all of the following events occur:
•
When an I2C failure is first detected
•
When the GIEI severity is changed from major to minor
•
When the GIEI flag is cleared
These Syslog messages are generated in both the static and dynamic sections of the show logging command output. A Syslog message
is also sent to the SNMP log server.
When the GIEI is set to major, the first Syslog message displayed is an Alert. The following example shows an Alert Syslog message
where the GIEI is set to major:
Brocade# show logging
Sysloglogging: enabled (0 messages dropped, 0 flushes, 1 overruns)
Buffer logging: level ACDMEINW, 50 messages logged
level code: A=alert C=critical D=debugging M=emergency E=error
I=informational N=notification W=warning
Static Log Buffer:
Apr 16 18:21:25:A:System: Power Supply 2 , middle, Not Installed (FAILED)
Apr 16 18:21:25:A:System: Power Supply 3 , top, Not Installed (FAILED)
Apr 16 18:21:25:A:System: bad i2c access (GIEI = set), Severity Major, Mux
index 0, Muxtap 4, ID 0x4, Addr0x5, (FANTRAY4)
Apr 16 18:21:25:I:System: last good i2c access, Muxindex 0, Muxtap 1, ID
0x9, Addr0x1, (SNM1TEMP)
Dynamic Log Buffer (50 lines):
Apr 16 18:21:25:A:System: bad i2c access (GIEI = set), Severity Major, Mux
index 0, Mux tap 4, ID 0x4, Addr 0x5, (FANTRAY4)
Apr 16 18:21:25:I:System: last good i2c access, Mux index 0, Mux tap 1, ID
0x9, Addr 0x1, (SNM1TEMP)
Mar 28 12:36:47:A:System: Set fan speed to MED (75%)
Mar 25 21:40:47:A:System: Set fan speed to MED-HI (90%)
The Syslog message shows the last successful I2C access by the management module and also contains the following information about
the failed device:
•
Current state of the GIEI flag
•
Severity of the failure: major or minor
•
MUX index number:
-
0-1 - there are total of 2 MUX indexes in NetIron XMR 32000 and Brocade MLX-32 devices.
-
The MUX index is always zero in 4-, 8-, and 16-slot NetIron XMR or Brocade MLX devices
212 Brocade MLX Series and Brocade NetIron XMR Installation Guide
53-1004195-02