Reference Guide

594 | Multiple Spanning Tree Protocol (MSTP)
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To change the port cost or priority of an interface:
View the current values for these interface parameters using the command
show config from INTERFACE
mode. See Figure 27-8.
Configure an EdgePort
The EdgePort feature enables interfaces to begin forwarding traffic 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 shutdown when it receives a BPDU.
When only
bpduguard is implemented, although the interface is placed in an Error Disabled state when
receiving the BPDU, the physical interface remains up and spanning-tree will drop
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.
To enable EdgePort on an interface, use the following command:
10-Gigabit Ethernet interfaces 2000
Port Channel with 100 Mb/s Ethernet interfaces 180000
Port Channel with 1-Gigabit Ethernet interfaces 18000
Port Channel with 10-Gigabit Ethernet interfaces 1800
Task Command Syntax Command Mode
Change the port cost of an interface.
Range: 0 to 200000
Default: see Table 27-2.
spanning-tree msti number cost cost INTERFACE
Change the port priority of an interface.
Range: 0 to 240, in increments of 16
Default: 128
spanning-tree msti number priority
priority
INTERFACE
Caution: Configure EdgePort only on links connecting to an end station. EdgePort can cause loops if it is enabled
on an interface connected to a network.
Task Command Syntax Command Mode
Enable EdgePort on an interface. spanning-tree mstp edge-port
[bpduguard |
shutdown-on-violation]
INTERFACE
Table 27-2. MSTP Default Port Cost Values
Port Cost Default Value