Chapter 45 Spanning Tree Protocol
XMG1915 Series User’s Guide
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SWITCHING > Spanning Tree Protocol > Spanning Tree Setup screen to activate one of the STP standards
on the Switch.
45.3 Spanning Tree Setup
There are three Auto path-cost Modes (see Table 132 on page 247). Choose the Auto Path-cost Mode
according to the device average link speeds in the STP network.
If most of your devices support high link speed, you should select Long or User-defined mode. The path
cost of link speed slower than 10 Mbps can be set to 2000000, and the path cost of link speed faster than
10 Gbps can be set to 200. This way, the path costs can better reflect actual link speeds with a wider
range (32 bits) of path cost values. If the link speeds within the system are averagely smaller than 1
Gbps, you should select Short mode since Short mode have path cost values more detailed defined for
link speeds under1 Gbps.
The path cost values are described in the following tables.
The Switch defines the following Short mode path costs.
The Switch defines the following Long mode path costs.
Table 129 Auto Path Cost Mode: Short
LINK SPEED AUTO PATH COST VALUE
Up to 4 Mbps 250
Up to 10 Mbps 100
Up to 16 Mbps 62
Up to 100 Mbps 19
Up to 1 Gbps 4
Up to 10 Gbps 2
More than 10 Gbps 1
Table 130 Auto Path Cost Mode: Long
LINK SPEED AUTO PATH COST VALUE
Up to 10 Mbps 2000000
Up to 100 Mbps 200000
Up to 1 Gbps 20000
Up to 2.5 Gbps 8000
Up to 5 Gbps 4000
Up to 10 Gbps 2000
More than 10 Gbps 200
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