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Cisco Routers for the Desperate, 2nd Edition by Michael W. Lucas

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Viewing ARP Caches and Finding Hosts

ARP, the Address Resolution Protocol, allows devices on an Ethernet to find each other. Each device on an Ethernet network has a MAC (Media Access Control) address, also known as a hardware address. A MAC address is a unique 48-bit hexadecimal number. Any Cisco device will display the ARP table with the show arp command.

  Switch>sho arp
  Protocol  Address          Age (min)  Hardware Addr   Type   Interface
Viewing ARP Caches and Finding Hosts Internet  10.184.0.243   Viewing ARP Caches and Finding Hosts14        0019.b9f0.ace1  ARPA  Vlan1 Internet 10.184.0.248 207 0004.23ce.45d7 ARPA Vlan1 Internet 10.184.0.254 ...

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