![]() If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. ![]() The information in this document was created from the devices in a specific lab environment. The information in this document is based on the Cisco Catalyst 3550 Switch. Refer to IEEE OUI and Company_id Assignments in order to determine IEEE OUI and company_id assignments. You can accomplish this type of restriction if you create MAC address ACLs and VLAN access maps and apply them to a VLAN interface. In some network scenarios, you want to block ARP packets based, not on the IP address, but on the Layer 2 MAC addresses. In a network, you can block ARP request packets in order to restrict user access. You can block a range of hosts if you disallow Address Resolution Protocol (ARP) packets that originate from these devices based on the IEEE Organizational Unique Identifier (OUI) and company_id assignments. ![]() ![]() You can block a single host or a range of hosts, based on the host network interface card (NIC) adapter manufacturer. The document demonstrates how to configure a MAC access control list (ACL) in order to block communication among devices within a VLAN. You can use any Catalyst 2970, 3560, or 3750 Series Switch in this scenario in order to obtain the same results. This document discusses the configuration for a Cisco Catalyst 3550 Series Switch. ![]()
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