Maximum lines/entries for an ACL

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Apr 18th, 2009
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Hi! I would like to know how many lines (or entries) can I enter for an extended or named ACL in a Cisco router (IOS 12.3)


Also: if you enter one line beyond that amount , what is the router's behaviour, does it overwrite the acl from the beginning or does it trigger an error msg?


Thanks!

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lamav Sat, 04/18/2009 - 09:29
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Hi:


I'm not sure there is a limit. If there is, not only have I never read it anywhere before, but I am positive you will never reach it. No one will.


But here is an interesting study on the effects of ACLs on Cisco router performance.


HTH


Victor

ccnastupro Sun, 04/19/2009 - 11:04
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Thanks a lot! I also thought so. The thing is I am not connecting to the router by console, I'm using an automated program so, it may write a lot of acls.

This router is a 800 series...

(I am not a hacker...:) )


If limit is about 10.000, well that's almost infinity, but 1000 or 500. Well 1000 it's still a lot but 500, maybe not so much.

I'll have a loook at the paper, thanks!

lamav Sun, 04/19/2009 - 12:02
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Hi:


Can I ask what you're using this router for that you are worried that 500 lines of access lists may not be enough to support your application?


Thanks


Victor

ccnastupro Mon, 04/20/2009 - 07:09
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The program I'm talking about writes as many acls as existing IDS alerts :) , for instance existing alerts in a log file.





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