Table of Contents
Advertisement
JunosE 11.3.x IP, IPv6, and IGP Configuration Guide
arp validate
Broadcast Addressing
22
If the validation is added statically via the CLI, the IP address–MAC address pairs are
stored in NVS. The entries are used for MAC validation only if MAC validation is enabled
on the interface via the ip mac-validate command.
CAUTION: When you configure an interface using the arp validate command,
you cannot overwrite the ARP values that were added by DHCP.
You can enable or disable MAC address validation on a per interface basis by issuing the
ip mac-validate command. See JunosE Physical Layer Configuration Guide or JunosE Link
Layer Configuration Guide for information.
A dynamic IP subscriber interface inherits the MAC address validation state (enabled or
disabled) configured for its parent static primary IP interface. See Configuring Subscriber
Interfaces in the JunosE Broadband Access Configuration Guide for information.
Use to add IP address–MAC address validation pairs. When validation is enabled, all
packets with the source IP address received on this IP interface are validated against
the IP-MAC entries.
To add a validation pair, specify one of the following:
ipAddress and macAddress of the interface
ipAddress, interfaceType and interfaceSpecifier (as indicated in Interface Types and
Specifiers in JunosE Command Reference Guide ), and an optional MAC address
You can issue this command only for an IP Ethernet-based interface.
For subscriber interface configurations, the IP address–MAC address pair must have
a matching source prefix that already exists on the subscriber interface. If the matching
source prefix does not exist, the IP–MAC address pair is rejected. See Configuring
Subscriber Interfaces in the JunosE Broadband Access Configuration Guide for information
about using subscriber interfaces.
Example 1—Packets originating from host 192.56.20.1 and validated at Gigabit Ethernet
interface with the MAC address 0090.1a00.0170
host1(config)#arp 192.56.20.1 gig 2/0 0090.1a00.0170 validate
Example 2—Subscriber interface MAC address validation enabled
host1(config)#arp 192.168.32.0 ip subsc1 000.0001.8100
Use the no version to remove an entry from the ARP cache.
See arp
A broadcast is a data packet destined for all hosts on a particular physical network.
Network hosts recognize broadcasts by special addresses.
Copyright © 2010, Juniper Networks, Inc.
Advertisement
Table of Contents
