Users Guide

870 Spanning Tree Protocol
Configuring MSTP Interface Settings
Use the following commands to configure MSTP settings for the switch.
Command Purpose
configure Enter global configuration mode.
interface interface Enter interface configuration mode for the specified interface.
The interface variable includes the interface type and number,
for example tengigabitethernet 1/0/3 or port-channel 4.
A range of interfaces can be specified using the interface range
command. For example, interface range tengigabitethernet
1/0/8-12 configures interfaces 8, 9, 10, 11, and 12. The range
keyword is also valid for LAGs (port-channels).
spanning-tree mst 0
cost cost
Set the external cost for the common spanning tree. (Range: 0–
200000000)
spanning-tree mst
instance-id cost cost
Configure the path cost for MST calculations. If a loop occurs,
the spanning tree considers path cost when selecting an
interface to put in the forwarding state.
• instance-ID — ID of the spanning -tree instance. (Range: 1-
4094)
• cost — The port path cost. (Range: 0–200,000,000)
spanning-tree mst
instance-id port-
priority priority
Specify the priority of the port.
The priority value is used to determine which ports are put in
the forwarding state and which ports are put in the blocking
state. A port with a lower priority value is more likely to be put
into a forwarding state.
• instance-ID — ID of the spanning tree instance. (Range: 1-
4094)
• priority — The port priority. (Range: 0–240 in multiples of 16)
CTRL + Z Exit to Privileged Exec mode.
show spanning-tree
interface instance
instance-id
View MST configuration information for the specified port or
LAG (port-channel) and instance.