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.
| 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) |
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.
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 |
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
This command was first available in ExtremeXOS 22.4.
This command is available on all Universal switches supported in this document.