Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 271
Clear ARP Cache, ARP Learning via Gratuitous ARP
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Clear ARP Cache To clear the ARP cache of dynamically learnt ARP information, use the following command in EXEC Privilege mode: Command Syntax clear arp-cache [interface | ip ip-address] [no-refresh] Command Mode Purpose EXEC privilege Clear the ARP caches for all interfaces or for a specific interface by entering the following information: • For a port channel interface, enter the keyword port-channel followed by a number from 1 to 128. • For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet followed by the slot/port information. • For a VLAN interface, enter the keyword vlan followed by a number between 1 and 4094. • For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE followed by the slot/port information. • ip ip-address (OPTIONAL) Enter the keyword ip followed by the IP address of the ARP entry you wish to clear. • no-refresh (OPTIONAL) Enter the keyword no-refresh to delete the ARP entry from CAM. Or use this option with interface or ip ip-address to specify which dynamic ARP entries you want to delete. Note: Transit traffic may not be forwarded during the period when deleted ARP entries are resolved again and re-installed in CAM. Use this option with extreme caution. ARP Learning via Gratuitous ARP Gratuitous ARP can mean an ARP request or reply. In the context of ARP learning via gratuitous ARP on FTOS, the gratuitous ARP is a request. A gratuitous ARP request is an ARP request that is not needed according to the ARP specification, but one that hosts may send to. Gratuitous ARP can: • detect IP address conflicts • inform switches of their presence on a port so that packets can be forwarded • update the ARP table of other nodes on the network in case of an address change In the request, the host uses its own IP address in the Sender Protocol Address and Target Protocol Address fields. When a gratuitous ARP is received, FTOS installs an ARP entry on the CPU. To enable ARP learning via gratuitous ARP, use the following command in CONFIGURATION mode: Task Enable ARP learning via gratuitous ARP. Command Syntax arp learn-enable Command Mode CONFIGURATION IPv4 Routing | 269
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