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PACL and performance

r.crist
Level 1
Level 1

Has anyone had any experience with using PACLs on the 4500 series switches? I'd like to apply an acl that denies inbound icmp on a large percentage of switch ports, but I'm unsure about how this will affect overall switch performance.

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tsettle
Level 3
Level 3

There will be no impact to forwarding performance. The traffic due to icmp would be reduced - saving cpu of destination devices and reducing bw utilization by the extra traffic. The reason is that ACL processing in done in hardware (follow configuration guidelines).

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_1_19/config/secure.htm

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3 Replies 3

tsettle
Level 3
Level 3

There will be no impact to forwarding performance. The traffic due to icmp would be reduced - saving cpu of destination devices and reducing bw utilization by the extra traffic. The reason is that ACL processing in done in hardware (follow configuration guidelines).

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_1_19/config/secure.htm

tsettle
Level 3
Level 3

There will be no impact to forwarding performance. The traffic due to icmp would be reduced - saving cpu of destination devices and reducing bw utilization by the extra traffic. The reason is that ACL processing in done in hardware (follow configuration guidelines).

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat4000/12_1_19/config/secure.htm

Thanks for the info and for forwarding the link.

Rich

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