Installation Guide

TABLE 39 Syslog buffer configuration (continued)
Field Description
level The message levels that are enabled. Each letter represents a message
type and is identified by the key (level code) below the value. If you disable
logging of a message level, the code for that level is not listed.
messages logged The total number of messages that have been logged since the software
was loaded.
level code The message levels represented by the one-letter codes.
Static and dynamic buffers
The software provides a static buffer and a dynamic buffer:
∙ Static - logs power supply failures, fan failures, and temperature warning or shutdown messages
∙ Dynamic - logs all other message types. In previous releases, power supply messages were displayed in static logs only, with
only the last event logged. Beginning with release 03.8.00, power supply messages are displayed in both static and dynamic
logs.
In the static log, new messages replace older ones, so only the most recent message is displayed. For example, only the most recent
temperature warning message will be present in the log. If multiple temperature warning messages are sent to the log, the latest one
replaces the previous one. The static buffer is not configurable.
The message types that appear in the static buffer do not appear in the dynamic buffer. The dynamic buffer contains up to the
maximum number of messages configured for the buffer (50 by default), then begins removing the oldest messages (at the bottom of
the log) to make room for new ones.
The static and dynamic buffers are both displayed when you enter the show logging command.
device(config)# show logging
...
Static Log Buffer:
Aug 27 12:42:42:A:Power Supply 6, 1st right, failed
Dynamic Log Buffer (50 lines):
Aug 27 12:19:04:I:Interface ethernet3/4, state up
Aug 27 12:19:04:I:Interface ethernet6/3, state up
Aug 27 12:19:04:I:Interface ethernet3/2, state up
Aug 27 12:19:04:I:Interface ethernet6/1, state up
Aug 27 12:19:00:N:Module up in slot 6
Aug 27 12:19:00:N:Module up in slot 3
Aug 27 12:18:43:I:Warm start
When you clear log entries, you can selectively clear the either buffer, or you can clear both. For example, to clear only the dynamic
buffer, enter the clear logging command at the Privileged EXEC level.
device# clear logging dynamic-buffer
Syntax: clear logging [ dynamic-buffer | static-buffer]
Specify the dynamic-buffer keyword to clear the dynamic buffer, or the static-buffer keyword to clear the static buffer. If you do not
specify a buffer, both buffers are cleared.
Router Headless State by MP Presence from LP
A router chassis is considered headless on entering a state where the MPs go down. When the chassis enters a router headless state, the
LPs are unaware of the MP’s state and continue to perform.
When there is a headless router condition, hardware flooding traffic is processed and traffic is dropped that needs to pass through the
MP. To avoid this situation, the LP maintains the MP state and brings itself down in case no MPs are present.
Managing Routers and Modules
Brocade NetIron MLXe Series Hardware Installation Guide
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