Specifications

284 ExtremeWare XOS 10.1 Command Reference Guide
Commands for Status Monitoring and Statistics
Usage Guidelines
Switch configuration and fault information is filtered and saved to target logs, in a memory buffer, and
in NVRAM. Each entry in the log contains the following information:
• Timestamp—records the month and day of the event, along with the time (hours, minutes, seconds,
and hundredths).
• Severity Level—indicates the urgency of a condition reported in the log. Table 10 describes the
severity levels assigned to events.
• Component, Subcomponent, and Condition Name—describes the subsystem in the software that
generates the event. This provides a good indication of where a fault might lie.
• Message—a description of the event occurrence. If the event was caused by a user, the user name is
also provided.
This command displays the messages stored in either the internal memory buffer or in NVRAM. The
messages shown can be limited by specifying a severity level, a time range, or a match expression.
Messages stored in the target have already been filtered as events occurred, and specifying a severity or
match expression on the
show log command can only further limit the messages shown.
If the messages keyword is not present, the messages stored in the memory-buffer target are displayed.
Otherwise, the messages stored in the specified target are displayed.
If the only keyword is present following the severity value, then only the events at that exact severity
are included. Without the
only keyword, events at that severity or more urgent are displayed. For
example, severity
warning implies critical, error, or warning, whereas severity warning only implies
only warning.
Messages whose timestamps are equal or later than the starting time and are equal or earlier than the
specified ending time will be shown if they also pass the severity requirements and match expression, if
specified.
If a match phrase is specified, the formatted message must match the simple regular expression
specified by
match-expression for it to be shown.
A simple regular expression is a string of single characters including the dot character (.), which are
optionally combined with quantifiers and constraints. A dot matches any single character while other
characters match only themselves (case is significant). Quantifiers include the star character (*) that
matches zero or more occurrences of the immediately preceding character or dot. Constraints include
the caret character (^) that matches at the beginning of a message, and the currency character ($) that
matches at the end of a message. Bracket expressions are not supported. There are a number of sources
available on the Internet and in various language references describing the operation of regular
expressions.
If the chronological keyword is specified, messages are shown from oldest to newest; otherwise,
messages are displayed newest to oldest.
Severity Level. The severity levels are critical, error, warning, notice, and info, plus three
severity levels for extended debugging,
debug-summary, debug-verbose, and debug-data. In log
messages, the severity levels are shown by four letter abbreviations. The abbreviated forms are:
• Critical—Crit
• Error—Erro
• Warning—Warn