Brocade TurboIron 24X Series Configuration Guide - Manual (Page 417)

Brocade TurboIron 24X Series Configuration Guide 383
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Configuring IP subnet, IPX network andprotocol-based VLANs
NOTE
You do not need to configure values for the STP parameters. All parameters have default values as
noted below. Additionally, all values will be globally applied to all ports on the system or on the
port-based VLAN for which they are defined.
To configure a specific path-cost or priority value for a given port, enter those values using the key
words in the brackets [ ] shown in the syntax summary below. If you do not want to specify values
for any given port, this portion of the command is not required.
Syntax: vlan <vlan-id> by port
Syntax: [no] spanning-tree
Syntax: spanning-tree [ethernet <portnum> path-cost <value> priority <value>] forward-delay
<value> hello-time <value> maximum-age <time> priority <value>
Bridge STP parameters (applied to all ports within a VLAN):
• Forward Delay – the period of time a bridge will wait (the listen and learn period) before
forwarding data packets. Possible values: 4 – 30 seconds. Default is 15.
• Maximum Age – the interval a bridge will wait for receipt of a hello packet before initiating a
topology change. Possible values: 6 – 40 seconds. Default is 20.
• Hello Time – the interval of time between each configuration BPDU sent by the root bridge.
Possible values: 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 subnet, IPX network andprotocol-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 subnets
• One for IPX Network 1
• One for the Appletalk protocol