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Troubleshooting ARP ARP Protocol Failure
OmniSwitch Troubleshooting Guide September 2005 page 11-3
When device A ARPs for the gateway IP address exist on the switch, an associated ARP cache entry is
created by the switch. This entry can be viewed by using the show arp command.
To search for a specific ARP entry, use the following command syntax:
show arp ip-address
For example:
-> show arp 10.255.11.219
Total 39 arp entries
Flags (P=Proxy, A=Authentication, V=VRRP)
IP Addr Hardware Addr Type Flags Port Interface
-----------------+-------------------+----------+-------+--------+-----------
10.10.42.159 08:00:20:a8:f0:8a DYNAMIC 16/ 2 vlan 10
To search for an ARP entry associated with a MAC address use the following command syntax:
show arp mac-address
For example:
-> show arp 10.255.11.219
Total 39 arp entries
Flags (P=Proxy, A=Authentication, V=VRRP)
IP Addr Hardware Addr Type Flags Port Interface
-----------------+-------------------+----------+-------+--------+-----------
10.10.42.159 08:00:20:a8:f0:8a DYNAMIC 16/ 2 vlan 10
This confirms that the switch has learned the ARP entry of the device A.
Now, device A should have also resolved the ARP entry to the gateway IP address. It can be verified on
the workstation’s command prompt using the following DoS command:
C:\> arp -a
Interface: 10.10.42.1 on Interface 0x1000003
Internet Address Physical Address Type
10.10.42.1 00-d0-95-79-62-d1 dynamic