Stinger®
IP2000 Configuration Guide
3-1
3
VLAN Configuration
Virtual LAN (VLAN) technology is supported with an optional software license.
VLANs are defined in IEEE standard 802.1Q (1998) for Local and Metropolitan Area
Networks: Virtual Bridged Local Area Networks.
VLANs are typically used for making physically separate nodes appear as if they are
part of a LAN. A VLAN helps to divide a network into separate broadcast domains
without the latency problems typically seen in routed networks, and without
modifying the physical topology. VLANs also allow a network administrator to group
users logically irrespective of where they are located physically.
Enter the following command to determine whether the VLAN license is enabled:
admin> get base vlan
[in BASE]
vlan-enabled = yes
The system sets this parameter to
yes
when the VLAN license is enabled. If the license
is not enabled, the system displays an error message if you configure VLAN
capabilities. For information about obtaining and enabling Lucent Technologies
software licenses, contact your Lucent sales representative.
The IP2000 VLAN implementation
The IP2000 VLAN implementation can support up to 4096 VLAN IDs on the Gigabit
Ethernet port. For full compatibility with IEEE 802.1Q standard, however, Lucent
recommends that you do not use 0 or 4095 as VLAN IDs. As a result, as many as 4093
logically separate VLAN IDs are supported.
In compliance with IEEE 802.1Q, the Stinger adds 4-byte tags to the header of each
Ethernet frame. The tags contain a VLAN ID and IEEE 802.1P priority information.
Most Ethernet switches and routers can use these tags to direct the frames only to the
specified VLAN. Typically, each VLAN ID on the Gigabit Ethernet interface is paired to
form a bridge circuit with one DSL interface. However, management VLANs, used for
SNMP or Telnet access from the LAN to the system itself, can also be configured with
the current software.