Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.7 - Page 1255

ARP Aging Dynamic entries in the ARP cache are aged. When an entry for a neighbor router reaches its maximum age, the system sends an ARP request to the neighbor router to renew the entry. Entries for neighbor routers should remain in the ARP cache as long as the neighbor continues to respond to ARP requests. ARP cache entries for neighbor hosts are renewed more selectively. When an ARP cache entry for a neighbor host reaches its maximum age, the system checks if the cache entry has been used recently to forward data traffic. If so, the system sends an ARP request to the entry's target IP address. If a response is received, the cache entry is retained and its age is reset to 0. By enabling the dynamic renew option, the system administrator can configure ARP to attempt to renew aged ARP entries regardless of their use for forwarding. If the system learns a new ARP entry but the hardware does not have space to add the new ARP entry, the system attempts to remove entries that have not been used for forwarding recently. This action may create space for new entries in the hardware's ARP table. arp Use the arp command in Global Configuration mode to create an Address Resolution Protocol (ARP) entry. The arp command optionally creates a static ARP entry in the selected VRF. Use the no form of the command to remove the entry. Syntax arp [vrf vrf-name]ip-address hardware-address [ interface interface-id] no arp ip-address • vrf-name-The name of the VRF with which the ARP entry is to be associated. If no VRF is specified, the ARP entry is associated with the global ARP table. • ip-address - IP address of a device on a subnet attached to an existing routing interface. • hardware-address - A unicast MAC address for that device. Layer 3 Routing Commands 1255