configure iparp proxy reachable | entry-required

configure iparp proxy [vlan all | {vlan} vlan_name] [reachable | entry-required]

Description

Configures whether the switch replies to ARP requests on the specified VLAN by proxy ARP if the route to the IP address is reachable, or only if proxy ARP entries have been created.

Syntax Description

vlan Selects VLAN(s) for the ARP requests.
vlan_name Specifies VLAN name for the ARP requests.
all Specifies all VLANs for the ARP requests.
reachable Specifies that the switch replies to ARP requests on the specified VLAN(s) by proxy ARP if the route to IP address is reachable. Configuration of proxy ARP entries is not required.
entry-required Specifies that the switch replies to ARP requests on the specified VLAN(s) by proxy ARP only if proxy ARP entries have been created. (Default)

Default

The default behavior is for the switch to reply to ARP requests on the specified VLAN(s) by proxy ARP only if proxy ARP entries have been created.

Usage Guidelines

If an ARP request is received by the switch, it checks the ExtremeXOS proxy ARP table (user adds the entries through the CLI). If it is present, an ARP reply is sent. If not present, it searches for the entry in the kernel route table. If this IP address is reachable, then the ARP reply is sent.

The following table summarizes the this command's behavior:

 

reachable

entry-required

(or command not configured)

Entry present in proxy ARP Table (static entry added through command configure iparp add) Reply to ARP request Reply to ARP request
Static entry not present in proxy ARP table Reply to ARP request if route is reachable No reply to ARP request
No static entry, but route reachable. Reply to ARP request
No static entry and route is not reachable No reply to ARP request
Static entry present and route is reachable Reply to ARP request
No static entry and route is not reachable No reply to ARP request
Route reachable Reply to ARP request
Route not reachable No reply to ARP request

Example

The following example configures the switch to reply to ARP requests on all VLANs by proxy ARP if the route to IP address is reachable:

configure iparp proxy vlan all reachable

History

This command was first available in ExtremeXOS 22.4.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X590, X620, X690, X870 series switches.