NETGEAR M4350-24F4V 24-Port 10G SFP+ Managed AV Network Switch - Manual (Page 430)

Your settings are saved. The routing function is removed from the VLAN but the
VLAN itself is not deleted.
8. To save the settings to the running configuration, click the Save icon.
Address Resolution Protocol
The Address Resolution Protocol (ARP) associates a Layer 2 MAC address with a Layer
3 IPv4 address. The switch support both a dynamic and manual ARP configuration. With
manual ARP configuration, you can statically add entries into the ARP table.
ARP is a required part of the Internet Protocol (IP) and is used to translate an IP address
to a media (MAC) address, defined by a LAN such as an Ethernet LAN. A device that
sends IP packets must learn the MAC address of the IP destination, or of the next hop
router, if the destination is not on the same subnet. This is achieved by broadcasting
an ARP request packet, to which the intended recipient responds by unicasting an ARP
reply that contains its MAC address. Once learned, the MAC address is used in the
destination address field of the Layer 2 header prepended to the IP packet.
The ARP cache is a table maintained locally on each device on a network. ARP cache
entries are learned by examining the source information in the ARP packet payload
fields, regardless of whether it is an ARP request or response. Thus, when an ARP request
is broadcast to all devices on a LAN or VLAN, each recipient can store the sender’s IP
and MAC address in its respective ARP cache. The ARP response (which is unicast
message), is normally detected only by the requestor, who stores the sender information
in its ARP cache. The most recent information always replaces existing content in the
ARP cache.
The number of supported ARP entries depends on a device.
A device can be moved in a network, which means that the device’s IP address that was
associated with one MAC address is now associated with another MAC address. A
device can also disappear from the network altogether (for example, it was reconfigured,
disconnected, or powered off). These situations cause stale information in the ARP
cache. Therefore, entries are updated or periodically refreshed to determine if an
address still exists. If an entry was identified as a sender of an ARP packet, the entry can
be removed from the ARP cache. You can configure an age-out interval that determines
how long an entry that is not updated remains in the ARP cache.
Display the ARP entries in the ARP cache
You can view ARP entries in the ARP cache. The ARP cache is a table that lists the remote
connections that were recently detected by the switch
Main User Manual 430 Manage Routing
Fully Managed Switches M4350 Series Main User Manual