Your Drawings Products Catalog
Baselining and documentation are very important prerequisites to supporting and continuing to support networks. Add any additional notes to your drawings and tables and take time to redraw them if necessary. Often colored pens pencils enable you to highlight different encapsulations, protocols, addres se s, settings, and such.
Ideally, you should use Figure 10-1 as a physical starting point, discover the network on your own, update your drawing accordingly. To make this a true discovery lab, you should have someone else cabling and load the preconfigured files for you. They are in the file called tt1 layer 2 configuration. Alternatively, era se all the configurations yourself, power the devices down, and wire the new scen inFigure 10-2. Then you can paste in the configurations from the file provided (or configure, if you
R3 requires you to look at your drawing more closely so that you can concentrate on just the interfaces bei ng used. Configure any missin g IF1 a ddresses and lssue a no shut command on any used interfaces that a re sh owin g as administratively down. Check the status of the interfaces in Example 3-9.
From your roof, note any distant obstacles and add them to your drawing with the approximate distance, ee i bht, pfP direction. Moving you r eFte-ma to a differ no area os the poof will pro bably not h elp you avo id these obstacles You will it eed to raise your antenna hig her to clear teem.
The designated root port is the path by which the 2900 gets to the root bridge. By definition all poi on the root bhi dge must be in a fouwardi ng st ate. However , STP takes care of the Layer 2 loop by blocking port 1 1 on the 2900. Analyze the 1900 to complete your drawing. (See Example 6-40.)
The sh aded output in Examples 10-1 through 10-3 are the types of things you should have discove recorded on your drawing or table for the Layer 2 baseline. To support Cisco you need to adjust th commands slightly according to the CatOS or IOS command sets. Example 10-1 illustrates the type things to look for on your routers. Much of my output has been omitted from the printed text but is included in the sample files. However, you should include everything in your baseline. For the ISDN Frame Relay devices, refer back to those chapters for information about commands such as show map, show frame lmi, show isdn status, and so on. I concentrate more on them in Trouble Tick
Now that you have configured your lab, perform some basic lower-layer tests to verify your drawing and your internetwork. Make sure all used interfaces are in a line protocol up state as in Example 3-6 if they are not in a line protocol up state, fix any noticeable problems at this point. Notice how show ip interface brief is a very appropriate command to quickly spot lower-level issues.
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