Specifications

13-7
System Management Software Configuration Guide for Cisco IE 2000U and Connected Grid Switches
Chapter 13 Configuring System Message Logging
Configuring System Message Logging
BEFORE YOU BEGIN
Caution By configuring abnormally large message queue limits and setting the terminal to "terminal monitor" on
a terminal that is accessible to intruders, you expose yourself to "denial of service" attacks. An intruder
could carry out the attack by putting the terminal in synchronous output mode, making a Telnet
connection to a remote host, and leaving the connection idle. This could cause large numbers of
messages to be generated and queued, and these messages could consume all available RAM. You should
guard against this type of attack through proper configuration.
DETAILED STEPS
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
line [console | vty] line-number
[ending-line-number]
Specify the line to be configured for synchronous logging of
messages.
• Use the console keyword for configurations that occur
through the switch console port.
• Use the line vty line-number command to specify which
vty lines are to have synchronous logging enabled. You
use a vty connection for configurations that occur
through a Telnet session. The range of line numbers is
from 0 to 15.
You can change the setting of all 16 vty lines at once by
entering:
line vty 0 15
Or you can change the setting of the single vty line being
used for your current connection. For example, to change the
setting for vty line 2, enter:
line vty 2
When you enter this command, the mode changes to line
configuration.
Step 3
logging synchronous [level
[severity-level | all] | limit
number-of-buffers]
Enable synchronous logging of messages.
• (Optional) For level severity-level, specify the message
severity level. Messages with a severity level equal to or
higher than this value are printed asynchronously. Low
numbers mean greater severity and high numbers mean
lesser severity. The default is 2.
• (Optional) Specifying level all means that all messages
are printed asynchronously regardless of the severity
level.
• (Optional) For limit number-of-buffers, specify the
number of buffers to be queued for the terminal after
which new messages are dropped. The range is 0 to
2147483647. The default is 20.