Supported Platforms
Related Documentation
Configuring Proxy ARP (CLI Procedure)
 | Note: This task uses Junos OS for EX Series switches and QFX3500 and QFX3600 switches with support for the Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does not support ELS, see Configuring Proxy ARP (CLI Procedure) or Configuring Proxy ARP . For ELS details, see Getting Started with Enhanced Layer 2 Software. |
You can configure proxy Address Resolution Protocol (ARP) on your switch to enable the switch to respond to ARP queries for network addresses by offering its own media access control (MAC) address. With proxy ARP enabled, the switch captures and routes traffic to the intended destination.
To configure proxy ARP on a single interface:
[edit interfaces]
user@switch# set interface-name unit logical-unit-number proxy-arp (restricted | unrestricted)  | Best Practice: We recommend that you configure proxy ARP in restricted mode. In restricted mode, the switch does not act as a proxy if the source and target IP addresses are on the same subnet. If you decide to use unrestricted mode, disable gratuitous ARP requests on the interface to avoid a situation wherein the switch’s response to a gratuitous ARP request appears to the host to be an indication of an IP conflict. |
To configure proxy ARP on an integrated routing and bridging (IRB) interface:
[edit interfaces]
user@switch# set irb.logical-unit-number proxy-arp restricted
