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Qtech QSW-3200-28T [86/146] Configure mstp interface priority

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instance in each MSTP region. The latter is parameter which has nothing to do with the

instance to determine CST topology consisted by each region.

Configure it in interface configuration mode:

 Configure the path cost in some instance

spanning-tree mst instance instance-num cost cost

 Configure external path cost

spanning-tree mst external cost cost

Example:

! Configure the path cost in instance 2 to be 10

QTECH(config-if-ethernet-0/0/2)#spanning-tree mst instance 1 cost 10

! Configure external path cost of e0/2 to be 10

QTECH(config-if-ethernet-0/0/2)#spanning-tree mst external cost 10

9.4.8 Configure MSTP interface priority

In MSTP, interface priority is based on each STP instance.

Configure it in interface configuration mode:

 Configure interface priority in some instance

spanning-tree mst instance instance-num port-priority priority

! Configure priority of e0/2 in instance 1 to be 16

QTECH(config-if-ethernet-0/0/2)#spanning-tree mst instance 1 port-priority 16

9.4.9 Configure spanning-tree mst root-guard

Configure spanning-tree root-guard can avoid interface to be root which is used for preventing

bone network topology destroying by outer BPDU packet. Configure it in interface

configuration mode:

 configure spanning-tree mst root-guard

spanning-tree mst root-guard

 restore to default root-guard

no spanning-tree mst root-guard

Example:

! Enable mst root-guard of e0/1

QTECH(config-if-ethernet-0/1)#spanning-tree mst root-guard

9.4.10 Display MSTP configuration information

Basic information of MSTP includes: one is MSTP configuring mark(including MSTP name,

MSTP revision level and the mapping relationship between MSTP and VLAN), the other is

STP instance and interface configuration.

Configure it in any mode:

 Display MSTP configuring mark

show spanning-tree mst config-id

 Display interface information of some instance

show spanning-tree mst instance instance-num interface [ interface-list ]

! Example:

Display MSTP configuring mark

QTECH(config)#show spanning-tree mst config-id

Display interface 0/2 information of instance1

Qtech QSW-3200-28T [86/146] Configure mstp interface priority

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