Reference Guide

IPv4 Addressing | 465
Clear ARP cache
To clear the ARP cache of dynamically learnt ARP information, use the following command in the EXEC
privilege mode:
Command Syntax Command Mode Purpose
clear arp-cache [interface |
ip ip-address] [no-refresh]
EXEC privilege Clear the ARP caches for all interfaces or for a specific interface by
entering the following information:
• For a 1-Gigabit Ethernet interface, enter the keyword
GigabitEthernet followed by the slot/port information.
• For a port channel interface, enter the keyword port-channel
followed by a number from 1 to 255 for TeraScale and
ExaScale.
• For a SONET interface, enter the keyword
sonet followed by
the slot/port information.
• 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.
E-Series ExaScale platforms support 4094 VLANs with FTOS
version 8.2.1.0 and later. Earlier ExaScale supports 2094
VLANS.
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.