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Cisco CCNA Security Training: Using the “access-list compiled” command 
 


Added: 08/12/2009, Hits: 4,923, Rating: 0, Comments: 0, Votes: 0
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In today’s article, I’m going to quickly inform you about the Cisco IOS Global configuration command named “access-list compiled”.

Network administrators (like you) use the “access-list compiled” command to enable the Turbo Access Control Lists (Turbo ACL) feature.

In other words, CCNA’s use this command to turn on the Turbo ACL feature on a router.

The Turbo ACL feature, gives a router the ability to perform ACL acceleration processing; instead of normal ACL processing. Meaning, the router is able to scan thru the ACLs looking for the proper one (ACL); instead of sequentially searching for the proper one (ACL). And, once an ACL is found it is compiled for Turbo ACL acceleration processing.

Note: In certain situations, this scanning and compilation may take a few seconds when the router is processing large and complex ACLs, or when the router is processing a configuration that contains a large number of ACLs.

Also, if you decide to make a change to an ACL while it’s being accelerated, that ACL will automatically be recompiled.

And, when Turbo ACL tables are being built (or rebuilt) for a particular ACL, the normal sequential ACL search is used until the new tables are ready for installation.

Below is the command’s syntax:

access-list compiled

As you can see, the command is very simply to implement; it doesn’t use any keywords or arguments.

Below is an example of the command being used:

Router>enable
Router#configure terminal
Router(config)#access-list compiled
Router(config)#exit
Router#copy run start


In the example above, the Turbo ACL feature is being enabled on the router.

And, like with mostly all Cisco IOS commands; you can use the word “no” in front of the command to remove (disable) the configured command; like you see below:

Router(config)#no access-list compiled

By the way, if you decide to use the command, make sure your router(s) is running Cisco IOS 12.1(1)E or higher.

I hope this article was very informative and helped you quickly understand the usage of the access-list compiled command. If you need to learn more; I suggest you visit my website, (www.ittechtips.com) were you’ll find the latest information regarding the Cisco CCNA (640-553) Security exam techniques.

To your success,

Charles Ross
CCNA- CCNP #CSCO10444244
http://www.ittechtips.com





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