The access control list (ACL) daughter cards for the Catalyst 8540 are ideal for supporting high-speed Layer-3 Gigabit backbone applications that require Layer 3 Security Capabilities. The ACL Daughter Cards are supported by the Catalyst 8540 platform, providing large enterprises and service providers with both Layer 3 and ATM switching in one integrated platform.The access control list (ACL) daughter cards implement data-plane access lists in hardware, providing high-speed performance. This extends the traffic control and security capabilities of the Catalyst 8540 beyond control-plane access lists, which are currently supported.The ACL daughter cards can be used with existing 10/100-Base-TX, 100-Base-FX, and Gigabit Ethernet interface modules on the Catalyst 8540. The daughter cards provide data-plane ACL functionality for both IP and IPX traffic.