Cisco Cisco Catalyst 4506-E Switch Troubleshooting Guide
These products use the most efficient TCAM 3 hardware.
Summary
The Catalyst 4500 programs the configured ACLs with use of the TCAM. TCAM allows for application
of the ACLs in the hardware-forwarding path with no impact on the performance of the switch.
Performance is constant despite the size of the ACL because performance of the ACL lookups is at line
rate. However, TCAM is a finite resource. Therefore, if you configure an excessive number of ACL
entries, you exceed the TCAM capacity. The Catalyst 4500 has implemented numerous optimizations
and provided commands to vary the programming algorithm of TCAM in order to achieve maximum
efficiency. TCAM 3 products such as the Supervisor Engine V-10GE and Catalyst 4948-10GE offer the
most TCAM resources for security ACL and QoS policies.
of the ACLs in the hardware-forwarding path with no impact on the performance of the switch.
Performance is constant despite the size of the ACL because performance of the ACL lookups is at line
rate. However, TCAM is a finite resource. Therefore, if you configure an excessive number of ACL
entries, you exceed the TCAM capacity. The Catalyst 4500 has implemented numerous optimizations
and provided commands to vary the programming algorithm of TCAM in order to achieve maximum
efficiency. TCAM 3 products such as the Supervisor Engine V-10GE and Catalyst 4948-10GE offer the
most TCAM resources for security ACL and QoS policies.
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Updated: Oct 18, 2005
Document ID: 66978
Page 16 of 16
Cisco - ACL and QoS TCAM Exhaustion Avoidance on Catalyst 4500 Switches
10/18/2005
http://www.cisco.com/warp/customer/473/tcam_cat_4500.html