[c-nsp] how ACLs affect the processing of a Cisco 7200 NPE-G2

[Steve McCrory]

The concept I was working with is true (adding more statements does not
impact performance) but perhaps my exact figures where slightly out,
based on the excerpt from Cisco:

" For ACLs larger than 3 entries, the CPU load required to match the
packet to the pre-determined packet-matching rule is lessened. The CPU
load is fixed, regardless of the size of the ACL, allowing for larger
ACLs without incurring any CPU overhead penalties. The larger the ACL,
the greater the benefit"

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dobbins, Roland
Sent: 09 November 2012 12:20
To: cisco-nsp NSP
Subject: Re: [c-nsp] how ACLs affect the processing of a Cisco 7200
NPE-G2


On Nov 9, 2012, at 5:48 PM, Steve McCrory wrote:

> This features compiles the ACLs and once enabled the performance
impact of a long list is the same as for 1 statement.

That isn't exactly the case, but it does make ACL processing much more
efficient.  

-----------------------------------------------------------------------
Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

	  Luck is the residue of opportunity and design.

		       -- John Milton


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