3Com 3500 - page 409

ip interface arpProxy 409
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ip interface arpProxy 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 n ot have
routing capabilities or a default gateway conf igured.
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, th e 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 othe r
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 drawb acks,
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 h ave more
than one interface)
■One or more
selectable
interface
indexes
■all
■? (for a list of
selectable
interface
indexes)
Current
value
ARP proxy
state
Whether you want to implement
ARP proxy on an interface. The
system prompts you for a state
for each interface.
■enabled
■disabled
Current
value