Configuring Virtual LANs (VLANs)
December 2005 © Foundry Networks, Inc. 11 - 21
1 – 10 seconds. Default is 2.
• Priority – a parameter used to identify the root bridge in a network. The bridge with the lowest value has the
highest priority and is the root. Possible values: 1 – 65,535. Default is 32,678.
Port Parameters (applied to a specified port within a VLAN)
• Path Cost – a parameter used to assign a higher or lower path cost to a port. Possible values: 1 – 65535.
Default is (1000/Port Speed) for Half-Duplex ports and is (1000/Port Speed)/2 for Full-Duplex ports.
• Priority – value determines when a port will be rerouted in relation to other ports. Possible values: 0 – 255.
Default is 128.
Configuring IP Sub-net, IPX Network and Protocol-Based VLANs
Protocol-based VLANs provide the ability to define separate broadcast domains for several unique Layer 3
protocols within a single Layer 2 broadcast domain. Some applications for this feature might include security
between departments with unique protocol requirements. This feature enables you to limit the amount of
broadcast traffic end-stations, servers, and routers need to accept.
Configuration Example
Suppose you want to create five separate Layer 3 broadcast domains within a single Layer 2 STP broadcast
domain:
• Three broadcast domains, one for each of three separate IP sub-nets
• One for IPX Network 1
• One for the Appletalk protocol
Also suppose you want a single router interface to be present within all of these separate broadcast domains,
without using IEEE 802.1Q VLAN tagging or any proprietary form of VLAN tagging.
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