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Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
Calculating Port Cost
Port cost value calculations are based on the bandwidth of the port. There are two classes of values. Short
(16-bit) values are specified by the IEEE 802.1D specification and range in value from 1 to 65535. Long
(32-bit) values are specified by the IEEE 802.1t specification and range in value from 1 to 200,000,000.
Assigning Short Port Cost Values
You can manually assign port costs in the range of 1 to 65535. Default cost values are as follows.
Port Speed
10 Mbps
100 Mbps
Assigning Long Port Cost Values
You can manually assign port costs in the range of 1 to 200,000,000. Recommended cost values are as
follows.
Port Speed
10 Mbps
100 Mbps
Follow the steps below to configure the spanning tree port cost of an interface.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
7.
Default Cost Value
100
19
Recommended Value
2,000,000
200,000
enable
configure terminal
interface {ethernet | fastethernet} interface-id
spanning-tree cost port-cost
spanning-tree vlan vlan-ID cost port-cost
end
show spanning-tree interface
How to Configure EtherSwitch HWICs
Recommended Range
200,000 to 20,000,000
20,000 to 2,000,000
Book Title
39
- Quick Links:
- Configuring Vlans
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