C613-50100-01 REV C Command Reference for x930 Series 716
AlliedWare Plus™ Operating System - Version 5.4.6-1.x
IP ADDRESSING AND PROTOCOL COMMANDS
ARP
OPPORTUNISTIC-ND
arp opportunistic-nd
Overview This command changes the behavior for unsolicited ARP packet forwarding on the
device.
Use this command to enable opportunistic neighbor discovery for the global ARP
cache.
When using VRF lite you can use this command to enable opportunistic neighbor
discovery for a named VRF lite instance.
Use the no variant of this command to disable opportunistic neighbor discovery
for the global ARP cache.
Syntax
arp opportunistic-nd
no arp opportunistic-nd
Syntax (VRF lite) arp opportunistic-nd [vrf <vrf-name>]
Default Opportunistic neighbor discovery is disabled by default.
Mode Global Configuration
Usage When opportunistic neighbor discovery is enabled, the device will reply to any
received unsolicited ARP packets (but not gratuitous ARP packets). The source
MAC address for the unsolicited ARP packet is added to the ARP cache, so the
device forwards the ARP packet. When opportunistic neighbor discovery is
disabled, the source MAC address for the ARP packet is not added to the ARP
cache, so the ARP packet is not forwarded by the device.
Note this command enables or disables opportunistic neighbor discovery for a VRF
lite instance if the VRF lite parameter and an instance name are applied. If a VRF
lite instance is not specified, then opportunistic neighbor discovery is enabled or
disabled for device ports configured for IPv4.
Examples To enable opportunistic neighbor discovery for the global ARP cache, enter:
awplus# configure terminal
awplus(config)# arp opportunistic-nd
To disable opportunistic neighbor discovery for the global ARP cache, enter:
awplus# configure terminal
awplus(config)# no arp opportunistic-nd
Parameter Description
vrf Apply this command to a VRF lite instance.
<vrf-name> The name of the VRF lite instance.
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