Allied Telesis AT-S63 - Manual (Page 561)

AT-S63 Management Software Command Line Interface User’s Guide
Section VII: Internet Protocol Routing 561
If you intend to use the IPv4 routing feature of the switch and assign
routing interfaces to all the local subnets and networks on a switch, this
requirement should not be a issue. However, if you choose not to use the
routing function and so not create interfaces or you have an AT-9400
Series switch that only supports one interface, some planning will be
necessary in order to use these features. At a minimum, you must create
one routing interface on the switch and plan your network so that the
switch can access the servers from the subnet of the interface.
As an example, assume you decided not to implement the IPv4 routing
feature on a switch that had four local subnets, but you wanted the switch
to send its events to a syslog server and have access to a RADIUS
authentication server. Assume also that you wanted to use a TFTP server
to upload and download files to the device. This would require that you
plan your network so that the switch could reach the syslog, RADIUS, and
TFTP servers from the same local subnet on the unit. You would also need
to assign an interface to the subnet. The switch, having only one interface,
would not route IPv4 packets among its local subnets and directly
connected networks, but would use the interface’s IP address to
communicate with the servers.
Enhanced Stacking
The enhanced stacking feature simplifies the task of managing the Allied
Telesyn switches in your network by allowing you to easily transition
among the switches in a stack during a management session.
The switches of an enhanced stack must be interconnected by a common
VLAN and the VLAN must be assigned a routing interface on each of the
switches. Furthermore, the routing interface in the common VLAN on the
master switch must be designated as the local interface, as described in
“Local Interface” on page 562.
There is an important difference between the need for interfaces with
enhanced stacking versus network servers, as explained in the previous
subsection. Network servers can be reached by the switch through
different interfaces in different subnets, simultaneously. In contrast, the
switches of an enhanced stack must share a common VLAN and subnet.
For background information and guidelines on the enhanced stacking
feature, refer to the AT-S63 Management Software Menus Interface
User’s Guide.
Remote Telnet, SSH, and Web Browser Management Sessions
To remotely manage a switch using a Telnet or SSH client, or a web
browser application, the remote management workstation must access the
switch through a subnet that has a routing interface. Furthermore, the
interface must be designated as the local interface on the switch. Only a
workstation that can reach the switch through the subnet of the local