Yoy need to set the level of messages
type in "logging buffered ?"
then choose level as below
<0-7> Logging severity level
<4096-2147483647> Logging buffer size
alerts Immediate action needed (severity=1)
critical Critical conditions (severity=2)
debugging Debugging messages (severity=7)
emergencies System is unusable (severity=0)
errors Error conditions (severity=3)
informational Informational messages (severity=6)
notifications Normal but significant conditions (severity=5)
warnings Warning conditions (severity=4)
every thing is enable but no loggin messge appears only specific types of messages not all
What specific loggings are you looking for?
By default, interfaces on line cards for 4500 and 6500 are disabled.
To enable it, you need to go into the interface-level and enter the command "logging event link-status". When you enable this command everytime the interface would go either down or up you'll see a few lines appear in the logs.