Enabling Proxy Arp; Clearing Arp Cache; Arp Learning Via Gratuitous Arp; Enabling Arp Learning Via Gratuitous Arp - Dell Z9500 Configuration Manual

Enabling Proxy ARP

By default, Proxy ARP is enabled. To disable Proxy ARP, use the no proxy-arp command in the interface mode.
To re-enable Proxy ARP, use the following command.
• Re-enable Proxy ARP.
INTERFACE mode
ip proxy-arp
To view if Proxy ARP is enabled on the interface, use the show config command in INTERFACE mode. If it is not listed in the
show config command output, it is enabled. Only non-default information is displayed in the show config command
output.

Clearing ARP Cache

To clear the ARP cache of dynamically learnt ARP information, use the following command.
• Clear the ARP caches for all interfaces or for a specific interface by entering the following information.
EXEC privilege
clear arp-cache [interface | ip ip-address] [no-refresh]
– ip ip-address (OPTIONAL): enter the keyword ip then the IP address of the ARP entry you wish to clear.
– no-refresh (OPTIONAL): enter the keywords no-refresh to delete the ARP entry from CAM. Or to specify which
dynamic ARP entries you want to delete, use this option with interface or ip ip-address.
– For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port information.
– For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
– For a port channel interface, enter the keywords port-channel then a number.
– For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
NOTE: Transit traffic may not be forwarded during the period when deleted ARP entries are resolved again and re-installed
in CAM. Use this option with extreme caution.

ARP Learning via Gratuitous ARP

Gratuitous ARP can mean an ARP request or reply.
In the context of ARP learning via gratuitous ARP on Dell Networking OS, the gratuitous ARP is a request. A gratuitous ARP
request is an ARP request that is not needed according to the ARP specification, but one that hosts may send to:
• detect IP address conflicts
• inform switches of their presence on a port so that packets can be forwarded
• update the ARP table of other nodes on the network in case of an address change
In the request, the host uses its own IP address in the Sender Protocol Address and Target Protocol Address fields.

Enabling ARP Learning via Gratuitous ARP

To enable ARP learning via gratuitous ARP, use the following command.
• Enable ARP learning via gratuitous ARP.
CONFIGURATION mode
arp learn-enable
IPv4 Routing 424