Syntax (EX Series)
The edit logical-systems hierarchy is not available on QFabric systems.
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 9.0 for EX Series switches.
Statement introduced in Junos OS Release 11.1 for the QFX Series.
Statement introduced in Junos OS Release 14.1X53-D20 for the OCX Series.
For Ethernet, Fast Ethernet, and Gigabit Ethernet interfaces only, configure Address Resolution Protocol (ARP) table entries mapping IP addresses to MAC addresses. IPv4 networks use ARP to map IP network addresses to physical (MAC) addresses. An address is resolved when the host device receives a proper ARP reply in response to the ARP request that it sent to a broadcast Ethernet address. The resolved addresses are stored in the ARP table for a configurable period of time. When an entry is close to expiration, it triggers the host to broadcast another ARP request to update the entry for that address. Only the intended receiver responds to the broadcast request; other recipients silently drop the request packet.
You can enable backup VRRP routers to learn ARP requests for VRRP-IP to VRRP-MAC address translation. You can also set the time interval between ARP updates.
By default, an ARP policer is installed that is shared among all the Ethernet interfaces on which you have configured the family inet statement. By including the arp statement at the [edit interfaces interface-name unit logical-unit-number family inet policer] hierarchy level, you can apply a specific ARP-packet policer to an interface. This feature is not available on EX Series switches.
When you need to conserve IP addresses, you can configure an Ethernet interface to be unnumbered by including the unnumbered-address statement at the [edit interfaces interface-name unit logical-unit-number family inet] hierarchy level.
For EX-Series switches, set only the time interval between ARP updates.
For unicast MAC addresses only, if you include the publish option, the router or switch replies to proxy ARP requests.
seconds—Configure the ARP request delay in seconds. We recommend configuring a value in the range of 3 through 6 seconds.
Values: aging-timer minutes—Time between ARP updates, in minutes.
Range: 1 through 6,00,000
This option reduces the amount of broadcast traffic normally sent to resolve expiring addresses. It also supports a special use case where access nodes are configured not to forward broadcast ARP requests towards customer CPEs for security reasons and instead translate ARP broadcasts to unicast requests.
This option affects only the update requests. Initial ARP requests are broadcast as usual.
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
system—To view this statement in the configuration.
system-control—To add this statement to the configuration.