Configuring Proxy ARP (CLI Procedure)
You can configure proxy Address Resolution Protocol (ARP) on your EX Series switch to enable the switch to respond to ARP queries for network addresses by offering its own MAC address. With proxy ARP enabled, the switch captures and routes traffic to the intended destination.
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Best Practice: We recommend that you disable gratuitous ARP requests on each interface on which proxy ARP is enabled. A gratuitous ARP request is an ARP request packet where the source and destination IP addresses are both set to the IP address of the host issuing the packet and the destination MAC is the broadcast address. Ordinarily, no reply packet will be sent. If gratuitous ARP requests are not disabled on the interfaces, the response of the switch to a gratuitous ARP request will appear to the host to indicate an IP conflict. |
To configure proxy ARP:
- Configure proxy ARP on a single interface:
[edit interfaces]
user@switch# set ge-0/0/3 unit 0 proxy-arp restrictedBest Practice: We recommend setting proxy ARP to restricted mode in most situations outside of a routed VLAN interface (RVI). When configuring proxy ARP on a routed VLAN interface, we recommend that you use unrestricted mode because in restricted mode, ARP resolution will not take place between two hosts on the VLAN with which the RVI is associated.
- Disable gratuitous ARP requests
on the interface:
[edit interfaces]
user@switch# set ge-0/0/3 no-gratuitous-arp-request
