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ARP Table Commands

Overview

ARP tables map IP addresses to MAC addresses on a switch. Use these commands when troubleshooting connectivity or identifying what device is on a specific IP.

Cisco IOS / Catalyst

# Show full ARP table
show arp

# Show ARP for specific IP
show arp 192.168.1.100

# Show ARP entries for a specific interface/VLAN
show arp vlan 10

# Clear ARP cache
clear arp-cache

Cisco Meraki

Meraki switches do not have a traditional CLI. Use the Dashboard:

  1. Go to Switch > Switches and select the switch

  2. Click Live Tools

  3. Select ARP Table to view current entries

  4. Alternatively, use Clients tab to see IP-to-MAC mapping

HP / Aruba ProCurve

# Show full ARP table
show arp

# Show ARP for specific IP
show arp 192.168.1.100

# Clear ARP table
clear arp

Netgear Managed (GS / M series)

# Show ARP table
show arp-table all

# Show ARP for specific IP
show arp-table 192.168.1.100

Tips

  • If a camera or controller is not showing in ARP, check that it is powered and the port link is up

  • Use MAC address to cross-reference with switch MAC-address table: show mac address-table (Cisco) or show mac-address (HP)

  • ARP entries expire — if device went offline recently, the entry may still show temporarily

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