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

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11-2. Protocol Filtering

  • Protocol filtering can be configured on Catalyst 4000, 5000, or 6000 series switches.

  • Protocol filtering does not require any special feature cards on the switch to operate.

  • Protocol filtering enables you to configure a port to filter or block flood (broadcast, multicasts, and unknown unicasts) traffic based on protocols.

  • Protocol filtering is only supported on Layer 2 access ports and cannot be configured on trunk links or Layer 3 ports.

  • Protocol filtering supports blocking of IP, IPX, AppleTalk, VINES, and DECnet traffic. All other protocols are not affected by protocol filtering.

  • Administrative protocols such as Spanning Tree Protocol (STP), Cisco Discovery Protocol (CDP), and VLAN Trunking Protocol (VTP) are not blocked ...

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