3Com 3500 manual Ip interface arpProxy

ip interface arpProxy 409

ip interface arpProxy

✓3500

✓9000

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9300

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

On a per-interface basis, enables or disables ARP proxy, which helps end stations on a subnetwork reach remote subnetworks that do not have routing capabilities or a default gateway configured.

Valid Minimum Abbreviation

ip i a

Important Considerations

■When ARP proxy is enabled and an end station sends an Address Resolution Protocol (ARP) request for a remote network, the system determines if it has the best route and then answers the ARP request by sending its own MAC address to the end station. The end station then sends the frames for the remote destination to the system, which uses its own routing table to reach the destination on the other network.

■When an interface is defined, the default ARP proxy state is enabled.

■The end stations must view the entire network configuration as one network (that is, by using a smaller subnet mask).

■Evaluate prolonged use of ARP proxy because it has some drawbacks, including increased ARP traffic and a need for larger ARP tables to handle the mapping of IP addresses to MAC addresses.

Options

Prompt Description Possible Values [Default]

Interface	Index number for the interface
	for which you want to enable or
	disable ARP proxy.
	(Not applicable if you have more
	than one interface)

ARP proxy Whether you want to implement

■ One or more	Current
selectable	value
interface
indexes

■all

■? (for a list of selectable interface indexes)

■enabled Current

state	ARP proxy on an interface. The
	system prompts you for a state
	for each interface.

■ disabled

value