Brocade FastIron Ethernet Switch Administration Guide - Manual (Page 36)

The user remained in the Privileged EXEC mode until 5:59 PM and 22 seconds. (The user could have
used the CONFIG modes as well. Once you access the Privileged EXEC level, no further
authentication is required to access the CONFIG levels.) At 6:01 PM and 11 seconds, the user ended
the CLI session.
Disabling the Syslog messages and traps
Logging of CLI access is enabled by default. If you want to disable the logging, enter the following
commands.
device(config)# no logging enable user-login
device(config)# write memory
device(config)# end
device# reload
Syntax: [no] logging enable user-login
Cancelling an outbound Telnet session
If you want to cancel a Telnet session from the console to a remote Telnet server (for example, if the
connection is frozen), you can terminate the Telnet session by doing the following.
1. At the console, press Ctrl+^ (Ctrl+Shift-6).
2. Press the X key to terminate the Telnet session.
Pressing Ctrl+^ twice in a row causes a single Ctrl+^ character to be sent to the Telnet server.
After you press Ctrl+^ , pressing any key other than X or Ctrl+^ returns you to the Telnet session.
Network Time Protocol Version 4 (NTPv4)
NTPv4 feature synchronizes the local system clock in the device with the UTC. The synchronization is
achieved by maintaining a loop-free timing topology computed as a shortest-path spanning tree rooted
on the primary server. NTP does not know about local time zones or daylight-saving time. A time
server located anywhere in the world can provide synchronization to a client located anywhere else in
the world. It allows clients to use different time zone and daylight-saving properties. Primary servers
are synchronized by wire or radio to national standards such as GPS. Timing information is conveyed
from primary servers to secondary servers and clients in the network. NTP runs on UDP, which in turn
runs on IP.
NTP has a hierarchical structure. NTP uses the concept of a stratum to describe how many NTP hops
away a machine is from an authoritative time source. A stratum 1 time server typically has an
authoritative time source such as a radio or atomic clock, or a Global Positioning System [GPS] time
source directly attached. A stratum 2 time server receives its time through NTP from a stratum 1 time
server and so on. As the network introduces timing discrepancies, lower stratum devices are a factor
less accurate. A hierarchical structure allows the overhead of providing time to many clients to be
shared among many time servers. Not all clients need to obtain time directly from a stratum 1
reference, but can use stratum 2 or 3 references.
NTP operates on a client-server basis. The current implementation runs NTP as a secondary server
and/or a NTP Client. As a secondary server, the device operates with one or more upstream servers
and one or more downstream servers or clients. A client device synchronizes to one or more upstream
servers, but does not provide synchronization to dependant clients. Secondary servers at each lower
level are assigned stratum numbers one greater than the preceding level. As stratum number
increases, the accuracy decreases. Stratum one is assigned to Primary servers.
Cancelling an outbound Telnet session
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