Juniper JUNOSE SOFTWARE 11.0.X - COMMAND REFERENCE A TO M 1-11-2010 Command Reference Manual page 523

error or 3 Error condition
warning or 4 Warning condition
notice or 5 Normal but significant condition
info or 6 Informational message
debug or 7 Debug message
verbosityLevel Verbosity of the log category's messages; can be any of the
following:
low Terse
medium Moderate detail
high Verbose
secondary Indicates that the specified filter conditions for the log are imposed
in addition to any that were previously specified; if omitted, the specified filter
conditions replace any that were previously specified
Privileged Exec
Mode
Chapter 5: D Commands
481
debug ip bgp