Chapter 16 Configuration Statements For System Setup - Juniper JUNOS OS 10.3 - SOFTWARE Manual

CHAPTER 16
Configuration Statements for System
Setup
arp
Syntax
Hierarchy Level
Release Information
Description
Options
Required Privilege
Level
Related
Documentation
Copyright © 2010, Juniper Networks, Inc.
arp {
aging-timer minutes;
passive-learning;
}
[edit system]
Statement introduced before Junos OS Release 7.4.
Statement introduced in Junos OS Release 9.0 for EX Series switches.
Specify ARP options. 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.
—Time interval in minutes between ARP updates. In environments where the
aging-timer
number of ARP entries to update is high (for example, on routers only, metro Ethernet
environments), increasing the time between updates can improve system
performance.
—Configures backup VRRP routers or switches to learn the ARP mappings
passive-learning
(IP-to-MAC address) for hosts sending the requests. By default, the backup VRRP
router drops these requests; therefore, if the master router fails, the backup router
must learn all entries present in the ARP cache of the master router. Configuring
passive learning reduces transition delay when the backup router is activated.
Default: 20 minutes
Range: 5 to 240 minutes
system—To view this statement in the configuration.
system-control—To add this statement to the configuration.
Configuring the JUNOS Software ARP Learning and Aging Options for Mapping IPv4
Network Addresses to MAC Addresses
Junos OS Network Interfaces Configuration Guide
197