Deployment Guide

The following lists the default values for port cost by interface.
Table 46. Default Values for Port Costs by Interface
Port Cost Default Value
1000-Mb/s Ethernet interfaces 20000
40-Gigabit Ethernet interfaces 1400
10-Gigabit Ethernet interfaces 2000
Port Channel with one 10–Gigabit Ethernet interface 2000
Port Channel with one 40-Gigabit Ethernet interface 1400
Port Channel with two 10-Gigabit Ethernet interfaces 1800
Port Channel with two 40-Gigabit Ethernet interfaces 600
To change the port cost or priority of an interface, use the following commands.
1 Change the port cost of an interface.
INTERFACE mode
spanning-tree msti number cost cost
The range is from 0 to 200000.
For the default, refer to the default values shown in the table.
2 Change the port priority of an interface.
INTERFACE mode
spanning-tree msti number priority priority
The range is from 0 to 240, in increments of 16.
The default is 128.
To view the current values for these interface parameters, use the show config command from INTERFACE mode.
Conguring an EdgePort
The EdgePort feature enables interfaces to begin forwarding trac approximately 30 seconds sooner.
In this mode, an interface forwards frames by default until it receives a BPDU that indicates that it should behave otherwise; it does not go
through the Learning and Listening states. The
bpduguard shutdown-on-violation option causes the interface hardware to be
shut down when it receives a BPDU. When you implement only
bpduguard, although the interface is placed in an Error Disabled state
when receiving the BPDU, the physical interface remains up and spanning-tree drops packets in the hardware after a BPDU violation.
BPDUs are dropped in the software after receiving the BPDU violation. This feature is the same as PortFast mode in spanning tree.
CAUTION
: Congure EdgePort only on links connecting to an end station. EdgePort can cause loops if you enable it on an
interface connected to a network.
To enable EdgePort on an interface, use the following command.
• Enable EdgePort on an interface.
INTERFACE mode
spanning-tree mstp edge-port [bpduguard | shutdown-on-violation]
Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior:
Multiple Spanning Tree Protocol (MSTP)
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