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The default path costs assigned to an interface vary according to the selected method:
BPDU Handling
— Determines how BPDU packets are managed when STP is disabled on the port/ device.
BPDUs are used to transmit spanning tree information. The possible field values are:
Filtering
— Filters BPDU packets when spanning tree is disabled on an interface. This is the default value.
Flooding
— Floods BPDU packets when spanning tree is disabled on an interface.
Priority (0-61440)
— Specifies the bridge priority value. When switches or bridges are running STP, each is
assigned a priority. After exchanging BPDUs, the device with the lowest priority value becomes the Root Bridge.
The default value is 32768. The port priority value is provided in increments of 4096. For example, 4096, 8192,
12288, etc.
Hello Time (1-10)
— Specifies the device Hello Time. The Hello Time indicates the amount of time in seconds
a root bridge waits between configuration messages. The default is 2 seconds.
Max Age (6-40
) — Specifies the device Maximum Age Time. The Maximum Age Time indicates the amount of
time in seconds a bridge waits before sending configuration messages. The default max age is 20 seconds.
Forward Delay (4-30)
— Specifies the device forward delay time. The Forward Delay Time indicates the amount
of time in seconds a bridge remains in a listening and learning state before forwarding packets. The default is 10
seconds.
Bridge ID
— Identifies the Bridge priority and MAC address.
Root Bridge ID
— Identifies the Root Bridge priority and MAC address.
Root Port
— Indicates the port number that offers the lowest cost path from this bridge to the Root Bridge. It is
significant when the Bridge is not the Root.
Root Path Cost
— The cost of the path from this bridge to the root.
Topology Changes Counts
— Specifies the total amount of STP state changes that have occurred.
Last Topology Change
— Indicates the amount of time that has elapsed since the bridge was initialized or reset,
and the last topographic change occurred. The time is displayed in a D/H/M/S format, for example,
2D/5H/10M/4S.
Interface
Long Short
LAG
20,000 4
1000 Mbps
20,000 4
100 Mbps
200,000 19
10 Mbps
2,000,000 100