Allied Telesis AT-S63 - Manual (Page 389)

AT-S63 Management Software Features Guide
Section VII: Routing 389
Note
The AT-9408LC/SP, AT-9424T/GB, and AT-9424T/SP Switches do
not use the ARP table to move packets through the switching matrix.
They refer to the table only when they perform a management
function requiring them to communicate with another network node.
Default Gateway The default gateway specifies the IP address of an interface on a
neighboring router. The switch’s management software uses this address
as the next hop to reaching a remote network device, such as a remote
Telnet, SSH, or web browser management workstation or a syslog server,
when the switch’s interface and the remote device are on different
subnets.
As an example, assume you wanted to manage the switch from a remote
management workstation on a different subnet than the local interface,
and needed the switch to access a RADIUS authentication server also on
a different subnet. Here, you would need to define a default gateway on
the switch so that the unit would know the next hop to reaching the remote
workstation and the RADIUS server.
The default gateway is only used for management functions, such as
communicating with a remote management workstation or sending events
to a syslog server. The default gateway is not used during the normal
Layer 2 switching of packets among the switch ports and, as such, is not
necessary for normal operations of the device.
You define the default gateway by creating a default route on the switch.
As explained in “Static Routes” on page 372, this type of route does not
specify a destination address. Rather, it simply defines the IP address of
the next hop, which becomes the default gateway for the switch.
The IP address of the next hop of the default route must be of the same
subnet as the switch’s interface.