
AirFlow AirSwitch 1200
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System Manual
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IX. Layer 2 Switching Features
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85
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When you create new port-based VLANs and associate FE interfaces (i.e. the twelve
10/100 ETH ports) with them, these interfaces are removed from the default VLAN1,
since FE interfaces can only belong to one VLAN at a time. By contrast, GE interfaces
(the two Gb uplink ports) can belong to multiple VLANs, as well as in the default
VLAN1.
Setting up
VLANs
To configure VLAN features in the CLI, you must navigate to the Configure level. and
type the command VLAN [ID]. This will move you to the VLAN submode, where you
can set parameters for the individual VLAN represented by the specified ID. If the
specified ID exists, you can make changes to the VLAN. If it does not exist already,
you are creating a new VLAN.
A VLAN is defined by three parameters: ID, Name, and Type. For internal VLANs, only
the ID field is editable; for existing user-defined VLANs, you can change any of the
parameters except Type.
The VLAN type for all User-Defined VLANs must be PORT-BASED—you cannot create
new internal VLANs. Note that these values are not case-sensitive.
You use the command END to exit the submode and return to global Configure level.
Example
The following example would create a new VLAN with ID 3190, and return to Config
level.
~AirSwitch~> enable
~AirSwitch~# config t
~AirSwitch~# (config)~# VLAN 3190
~AirSwitch~# (config-vlan)~# name SystemTest
~AirSwitch~# (config-vlan)~# type Port-Based
~AirSwitch~# (config-vlan)~# end
~AirSwitch~# (config)~#
The commands for creating a new VLAN are the same as for changing one or more
parameters of an existing one. If the specified ID does not exist yet, a new VLAN will
be defined; if it does already exist, it will be changed to reflect any new parameter
values.
Note that you can also use the NO and SHOW commands from inside VLAN submode.
For complete list of all commands, see "The VLAN Submode," on
Spanning Tree
Protocol (STP)
Spanning Tree Protocol (STP) is a Layer 2 link management protocol that ensures
redundant links between end stations while protecting against the creation of data
loops. It does this by comparing priority levels assigned to all switches in the net-
work, and to all ports within those switches. In addition, it considers the assigned
data speed (referred to as the port cost) of each port in the network. Whenever a
switch detects two or more redundant paths between end stations, the spanning
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