Allied Telesis AT-S63 - Manual (Page 92)

Chapter 4: Enhanced Stacking
92 Section I: Basic Operations
For the most part, routing interfaces are limited to the IPv4 packet routing
feature and are unnecessary beyond that feature. There are, however, a
few exceptions. One is the enhanced stacking feature. The rule is that the
master switch of an enhanced stack must have at least one interface and
the interface must be assigned to the common subnet that interconnects
the switches of the stack. Furthermore, the interface must be designated
as the switch’s local interface. The act of designating an interface as the
local interface tells the switch which interface and which subnet it should
use for the enhanced stacking feature.
For background information on the IPv4 routing feature, refer to the latest
version of the AT-S63 Management Software Command Line Interface
User’s Guide. To configure routing interfaces using the menus interface,
refer to Chapter 29, “Internet Protocol Version 4 Routing Interfaces” on
page 697 in this guide.
Slave Switches
A slave switch of an enhanced stack does not need an interface and, as
such, does not need a local interface. And even if you do create
interfaces, you do not have to designate a local interface. What it does
need is to be interconnected with the master switch through the common
VLAN, as explained earlier.
However, if on a slave switch in a stack you do designate an interface as a
local interface, it must be applied to the common subnet that interconnects
the switches. The only circumstance in which you would designate a local
interface on a slave switch is if you wanted to be able to remotely manage
the device independently of the stack. For further information on remote
management, refer to “Planning for Remote Management” on page 49.
Enhanced
Stacking
Compatibility
This version of enhanced stacking is compatible with earlier AT-S63
versions and the enhanced stacking feature in the AT-8000 Series,
AT-8400 Series, and AT-8500 Series switches. As such, an enhanced
stack can consist of various switch models, though the following issues
need to be considered when building this type of enhanced stack:
ˆ The management VLAN of an AT-8000 Series, AT-8400 Series, or
AT-8500 Series switch must be assigned to the common VLAN
interconnecting the switches of the stack. For instructions on how to
select the management VLAN on an AT-8000 Series, AT-8400 Series,
or AT-8500 Series switch, refer to the appropriate user’s guide.
ˆ Though the master switch of an enhanced stack can be any switch that
supports this feature, Allied Telesyn recommends choosing an
AT-9400 Series switch to perform that role. To use an AT-8000 Series,
AT-8400 Series, or AT-8500 Series switch as the master switch, you
must assign it an IP address that is part of the same common subnet
that interconnects the switches of the stack. For instructions on how to
assign an IP address to an AT-8000 Series, AT-8400 Series, or
AT-8500 Series switch, refer to the appropriate user’s guide.