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Routing & Switching · Intermediate

STP Path Cost

The cost STP assigns to a port based on its speed, summed toward the root to choose root and designated ports.

Definition

Short (802.1D-1998) costs: 10 Mbps 100, 100 Mbps 19, 1 Gbps 4, 10 Gbps 2. Long (802.1t) costs: 10 Gbps 2,000, 1 Gbps 20,000, 100 Mbps 200,000. Cisco uses short by default unless spanning-tree pathcost method long is set; Junos and MST use long.

Example

spanning-tree vlan 10 cost 10 on an interface

Exam tip

Know the short cost values: 100, 19, 4, 2 for 10M, 100M, 1G and 10G.

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