Extreme Networks ExtremeWare 7.7, Command Reference Manual

Page: 1664 / 2620

1664 ExtremeWare 7.7 Command Reference Guide
IP Unicast Commands
configure iparp add proxy
configure iparp add proxy <ip address> {<mask>} {<mac_address>} {always}
Description
Configures the switch to respond to ARP Requests on behalf of devices that are incapable of doing so.
Up to 64 proxy ARP entries can be configured.
Syntax Description
Default
N/A
Usage Guidelines
When
mask
is not specified, an address with the mask 255.255.255.255 is assumed. When
mac_address
is not specified, the MAC address of the switch is used in the ARP Response. When
always
is specified,
the switch answers ARP Requests without filtering requests that belong to the same subnet of the
receiving router interface and specifying a MAC address becomes optional.
After IP ARP is configured, the system responds to ARP Requests on behalf of the device as long as the
following conditions are satisfied:
• The valid IP ARP Request is received on a router interface.
• The target IP address matches the IP address configured in the proxy ARP table.
• The proxy ARP table entry indicates that the system should always answer this ARP Request,
regardless of the ingress VLAN (the
always
parameter must be applied).
After all the proxy ARP conditions have been met, the switch formulates an ARP Response using the
configured MAC address in the packet.
Example
The following command configures the switch to answer ARP Requests for all devices with the address
range of 100.101.45.1 to 100.101.45.255:
configure iparp add proxy 100.101.45.0/24
History
This command was available in ExtremeWare 2.0.
This command was added to the “e” series of switches in ExtremeWare 7.1e.
ip address Specifies an IP address.
mask Specifies a subnet mask.
mac_address Specifies a MAC address.
always Specifies all ARP Requests.