1-3Value Description4 Proteon ProNET (Token Ring)5 Chaos6 IEEE802.X7 ARC networkARP TableIn an Ethernet, the MAC addresses of two hosts must be available for the two hosts to communicatewith each other. Each host in an Ethernet maintains an ARP table, where the latest used IPaddress-to-MAC address mapping entries are stored. S5600 series Ethernet switches provide thedisplay arp command to display the information about ARP mapping entries.ARP entries in an S5600 series Ethernet switch can either be static entries or dynamic entries, asdescribed in Table 1-3.Table 1-3 ARP entriesARP entry Generation Method Maintenance ModeStatic ARP entry Manually configured Manual maintenanceDynamic ARP entry Dynamically generatedARP entries of this type age withtime. The aging period is set by theARP aging timer.ARP ProcessFigure 1-2 ARP processSuppose that Host A and Host B are on the same subnet and that Host A sends a message to Host B.The resolution process is as follows:2) Host A looks in its ARP mapping table to see whether there is an ARP entry for Host B. If Host Afinds it, Host A uses the MAC address in the entry to encapsulate the IP packet into a data link layerframe and sends the frame to Host B.3) If Host A finds no entry for Host B, Host A buffers the packet and broadcasts an ARP request, inwhich the source IP address and source MAC address are respectively the IP address and MACaddress of Host A and the destination IP address and MAC address are respectively the IP
