#Troubleshoot cisco mac address table how to
#Troubleshoot cisco mac address table software

TCAM allows a packet to be evaluated against an entire access list in a single table lookup. Ternary Content Addressable Memory (TCAM)-In multilayer switches, all the processes that access control lists (ACLs) provide in traditional routing, such as matching, filtering, or control specific traffic, are implemented in hardware.

If a MAC address is found already present in the table for the correct arrival port, only its timestamp is updated. If a MAC address learned on one switch port has moved to a different port, the MAC address and timestamp are recorded for the most recent arrival port. The port of arrival and the VLAN are both recorded in the table, along with a timestamp. As frames arrive on switch ports, the source MAC addresses are learned and recorded in the CAM table. All hosts within the broadcast domain receive the ARP request, and only Host A responds with its MAC address.Д¬AM-All Catalyst switch models use a CAM table for Layer 2 switching. Host B generates a broadcast message for all hosts within the broadcast domain to obtain the MAC address associated with the IP address of Host A. For example, Host B wants to send information to Host A but does not have the MAC address of Host A in its ARP cache. Background InformationД¬atalyst switches maintain several types of tables that are tailored for Layer 2 switching or multilayer switching (MLS), and are kept in very fast memory so that many fields within a frame or packet can be compared in parallel.ДЄRP-Maps an IP address to a MAC address in order to provide IP communication within a Layer 2 broadcast domain. Refer to Cisco Technical Tips Conventions for more information on document conventions.

#Troubleshoot cisco mac address table software

This document is not restricted to specific software and hardware versions. There are no specific requirements for this document.

#Troubleshoot cisco mac address table how to

This document provides information on how to troubleshoot Address Resolution Protocol (ARP) or Content Addressable Memory (CAM) table-related issues on Catalyst 6500/6000 Switches.