Allied Telesis AT-S63 - Manual (Page 557)

AT-S63 Management Software Command Line Interface User’s Guide
Section VII: Internet Protocol Routing 557
Routing
Interfaces and
Management
Features
Routing interfaces are primary intended for the IPv4 packet routing
feature. There are, however, a number of management functions that rely
on the presence of at least one routing interface on the switch to operate
properly. The switch uses the IP address of an interface as its source
address when it performs the management function. The management
functions are listed here:
ˆ Network servers
ˆ Enhanced stacking
ˆ Remote Telnet, SSH, and web browser management sessions
ˆ Pinging a remote device
ˆ DHCP or BOOTP server
Network Servers
A local subnet on the switch must have an interface if the device is using
the subnet to access any of the following types of network servers:
ˆ SNTP server for setting the switch’s date and time.
ˆ RADIUS or TACACS+ authentication server for manager access
accounts and 802.1x port-based network access control.
ˆ Syslog server for storing events from the switch’s event logs.
ˆ FTP server for uploading and downloading files to the switch.
The switch uses the IP address of the interface as its source address
when communicating with the network server. Without a routing interface
on the subnet, the switch will not have a source IP address to include in its
packets. For example, the switch, in order to set its date and time using an
SNTP server, must have a routing interface on the local subnet from
where it is accessing the server.
The servers can be located on different routing interfaces on the switch.
For instance, the switch can access an SNTP server through one interface
and a RADIUS authentication server from another. This differs from earlier
versions of the AT-S63 management software where all the servers had to
be members of what was referred to as the “management VLAN.”
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.