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Switch Overview SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
VLAN Support
The virtual LAN (VLAN) concept creates a virtual switch within a physical switch
or stack of switches. A VLAN consists of CRFs and has its own bridge relay
function attached. Frames are not forwarded across VLANs and ring numbers must
be unique within a VLAN.
•
A VLAN consists of a number of ports of a switch or stack of switches
•
No frames are forwarded between ports belonging to different VLANs
•
Port groups on different VLANs may be assigned the same ring number, but
ring numbers must be unique within the same VLAN
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For each VLAN, the stack can be assigned a separate IP address
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The spanning tree protocol is executed independently within each VLAN.
However, since all BRFs use the same Bridge ID for the spanning tree
algorithm, the spanning tree protocol will not function if ports from different
BRFs within one switch are connected.
A sample VLAN with SmartStack STS16-20R is shown below.
Figure 7. A SmartStack STS16-20R Switch Configured
with Two VLANs
CRF 2CRF 1
CRF 3
CRF 4
BRF 1 BRF 2
VLAN 1 VLAN 2
Switch