If you want to time stamp the show commands along with current CPU utilization for a particular session, issue the following command.
terminal exec prompt timestamp
enable
Sample Output:
cs1#show run
Load for five secs: 0%/0%; one minute: 1%; five minutes: 1%
Time source is NTP, *11:00:00.713 Pacific Wed Feb 25 2009
Building configuration...
Current configuration : 30463 bytes
!
show plat hard cap fabric
The output of the above command gives bus utlization etc. It is a very nice command
You always wanted to know the peak backplane utilization of Catalyst 6500 series switch and when it occurred. You can find those details by typing this command.
Fiber Optic Circulator Applications
Fiber optic circulators are non-reciprocating, one directional, three-port devices that are used in a wide range of optical setups and for numerous applications. An optical circulator is analogous to an electronic circulator and both perform similar functions. An optical circulator is a three-port device that allows light to travel in only one direction. A signal entered to Port 1 will exit Port 2, while a signal entering Port 2 will exit Port 3 all with minimal loss. Light entering port 2 experiences a large amount of loss at port 1, and light entering port 3 experiences a large amount of loss at ports 2 and 1.
| Optical circulators are non-reciprocal optics. This means that any change in the properties of the light caused by passing through the device are not reversed by traveling in the opposite direction. Another example of non-reciprocal optics are Faraday rotators which are sometimes used in isolators. Because of its high isolation and low insertion loss, optical circulators are widely used in advanced communication systems as add-drop multiplexors, bi-directional pumping, and chromatic dispersion compensation devices. The example to the right depicts the use of a circulator to drop an optical channel from a DWDM system using a fiber bragg grating. The input DWDM channels are coupled into Port 1 of the device with a FBG device connected to Port 2. The single wavelength reflected off the FBG then reenters the circulator in port 2 and is routed accordingly to Port 3. The remaining signals pass through the FBG and exit on the top fiber. |
|
Circlulators can also be used to send optical signal in two directions down a single fiber. A circulator is located at both ends of the fiber. Each circulator functions to add a signal in one direction while removing the signal in the other. See the example below.
During my training at Juniper last week I found these important document resources. I felt that these will be useful for all and sending across. The training basically covered all the topics for JNCIA-M. The training was great. Now I feel very comfortable with Junos configurations. Obviously I should keep using what I learnt there :)
JNCIA-M Study Guide:
You can download all the study guides from Juniper for free. Herewith I am attaching the link for JNCIA study Guide. I am motivated to take this exam.
http://www.juniper.net/training/certification/JNCIA_studyguide.pdf
Juniper Technical documents:
This link has all Juniper technical documentation. It will be worth to book mark.
http://www.juniper.net/techpubs/
Junos to IOS command reference:
I thought I need to make a list of equivalent commands in Junos to IOS, but they have it already on their website. You can download that from the following link.
https://www.juniper.net/customers/csc/documentation/techdocs/downloads/pdf/350023.pdf
Juniper router simulators:
Not but least. The following links explain how to simulate Juniper router on your PC. The simulator will help you in practicing the commands and other features.
http://www.smogey.net/tech/Juniper/Olive/index.htm#credit
http://brokenpipes.blogspot.com/2008/01/olive-is-alive.html
Please let me know if you have any questions.
Thank you.
JNCIA Study Guide can be downloaded from:
