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Cisco® Field Manual: Catalyst® Switch Configuration by Steve McQuerry, Dave Hucaby

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11-4. VLAN Access Control Lists

  • Access control lists (ACLs) define how traffic is to be handled as it passes through a network device.

  • ACLs use addressing and port information to control conversations.

  • ACLs are typically implemented in routers, but new hardware allow Layer 2 and Layer 3 switches to consult the list before passing the packet.

  • ACLs enable users to configure any switch to control traffic based on Layer 3 and above of the OSI reference model.

  • These ACLs are mapped to a VLAN or a Layer 2 port to control traffic flows.

  • VACLs are controlled in hardware and are not supported on all platforms.

  • Currently VACLs are supported on the 6000 (with a Policy Feature Card [PFC] or PFC2), the 3550, and the 2950 series switches.

The VLAN ACL (VACL) is ...

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