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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
ip sticky-arp (global configuration)
ip sticky-arp (global configuration)
Use the ip sticky-arp global configuration command to enable sticky Address Resolution Protocol
(ARP) on a switch virtual interface (SVI) that belongs to a private VLAN. Use the no form of this
command to disable sticky ARP.
ip sticky-arp
no ip sticky-arp
Syntax Description This command has no arguments or keywords.
Defaults Sticky ARP is enabled.
Command Modes Global configuration
Command History
Usage Guidelines Sticky ARP entries are those learned on private-VLAN SVIs. These entries do not age out.
The ip sticky-arp global configuration command is supported only on SVIs belonging to private
VLANs.
• When you configure a private VLAN, sticky ARP is enabled on the switch (the default).
If you enter the ip sticky-arp interface configuration command, it does not take effect.
If you enter the no ip sticky-arp interface configuration command, you do not disable sticky ARP
on an interface.
Note We recommend that you use the show arp privileged EXEC command to display and verify
private-VLAN interface ARP entries.
• If you disconnect the switch from a device and then connect it to another device with a different
MAC address but with the same IP address, the ARP entry is not created, and this message appears:
*Mar 2 00:26:06.967: %IP-3-STCKYARPOVR: Attempt to overwrite Sticky ARP entry:
20.6.2.1, hw: 0000.0602.0001 by hw: 0000.0503.0001
• If a MAC address of a device changes, you must use the no arp ip-address global configuration
command to manually remove the private-VLAN interface ARP entries.
• Use the arp ip-address hardware-address type global configuration command to add a
private-VLAN ARP entry.
Release Modification
12.2(53)SE2 This command was introduced.
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