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PowerConnect B-Series FCX Configuration Guide 259
53-1002266-01
Configuring STP related features
8
The priority <value> parameter specifies the priority of the bridge. You can enter a value from 0 –
65535. A lower numerical value means the bridge has a higher priority. Thus, the highest priority
is 0. The default is 32768.
You can specify some or all of these parameters on the same command line. If you specify more
than one parameter, you must specify them in the order shown above, from left to right.
Changing port parameters
The 802.1W port commands can be enabled on individual ports or on multiple ports, such as all
ports that belong to a VLAN.
The 802.1W port parameters are preconfigured with default values. If the default parameters
meet your network requirements, no other action is required.
You can change the following 802.1W port parameters using the following method.
PowerConnect(config)#vlan 10
PowerConnect(config-vlan-10)#spanning-tree 802-1w ethernet 5 path-cost 15
priority 64
Syntax: spanning-tree 802-1w ethernet <port> path-cost <value> | priority <value> |
[admin-edge-port] | [admin-pt2pt-mac] | [force-migration-check]
The ethernet <port> parameter specifies the interface used. Specify the <port> variable in the
following formats:
• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
The path-cost <value> parameter specifies the cost of the port path to the root bridge. 802.1W
prefers the path with the lowest cost. You can specify a value from 1 – 20,000,000. Table 52
shows the recommended path cost values from the IEEE standards.
• The priority <value> parameter specifies the preference that 802.1W gives to this port relative
to other ports for forwarding traffic out of the topology. You can specify a value from 0 – 240, in
increments of 16. If you enter a value that is not divisible by 16, the software returns an error
message. The default value is 128. A higher numerical value means a lower priority; thus, the
highest priority is 0.
• Set the admin-edge-port to enabled or disabled. If set to enabled, then the port becomes an
edge port in the domain.
TABLE 52 Recommended path cost values of 802.1W
Link speed Recommended (Default) 802.1W
path cost values
Recommended 802.1W patch cost range
Less than 100 kilobits per second 200,000,000 20,000,000 – 200,000,000
1 Megabit per second 20,000,000 2,000,000 – 200,000,000
10 Megabits per second 2,000,000 200,000 – 200,000,000
100 Megabits per second 200,000 20,000 – 200,000,000
1 Gbps per second 20,000 2,000 – 200,000,000
10 Gbps per second 2,000 200 – 20,000
100 Gbps per second 200 20 – 2,000
1 Terabits per second 20 2 – 200
10 Terabits per second 2 1 – 20