Set Arp Encapsulation - Cisco Catalyst 3750 Software Configuration Manual

Chapter 28 Configuring IP Unicast Routing
Command
Step 3 arp ip-address hardware-address type [alias]
Step 4
interface interface-id
Step 5
arp timeout seconds
Step 6
end
Step 7 show interfaces [interface-id]
Step 8 show arp
or
show ip arp
Step 9
copy running-config startup-config
To remove an entry from the ARP cache, use the no arp ip-address hardware-address type global
configuration command. To remove all nonstatic entries from the ARP cache, use the clear arp-cache
privileged EXEC command.

Set ARP Encapsulation

By default, Ethernet ARP encapsulation (represented by the arpa keyword) is enabled on an IP interface.
You can change the encapsulation methods to SNAP if required by your network.
Beginning in privileged EXEC mode, follow these steps to specify the ARP encapsulation type:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
arp {arpa | snap}
Step 4
end
Step 5
show interfaces [interface-id]
Step 6
copy running-config startup-config
To disable an encapsulation type, use the no arp arpa or no arp snap interface configuration command.
78-15870-01
Purpose
(Optional) Specify that the switch respond to ARP requests as if
it were the owner of the specified IP address.
Enter interface configuration mode, and specify the interface to
configure.
(Optional) Set the length of time an ARP cache entry will stay in
the cache. The default is 14400 seconds (4 hours). The range is
0 to 2147483 seconds.
Return to privileged EXEC mode.
Verify the type of ARP and the timeout value used on all
interfaces or a specific interface.
View the contents of the ARP cache.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the Layer 3
interface to configure.
Specify the ARP encapsulation method:
arpa—Address Resolution Protocol
•
snap—Subnetwork Address Protocol
•
Return to privileged EXEC mode.
Verify ARP encapsulation configuration on all interfaces or
the specified interface.
(Optional) Save your entries in the configuration file.
Catalyst 3750 Metro Switch Software Configuration Guide
Configuring IP Addressing
28-9