Qtech QSW-3200-28T [85/146] Configure mstp interface path cost

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 Configure mapping relationship between MSTP and VLAN

spanning-tree mst instance instance-num vlan vlan-list

Example:

! Configure MSTP name to be QTECH

QTECH(config)#spanning-tree mst name QTECH

! Configure MSTP revision level to be 10

QTECH(config)#spanning-tree mst revision 10

! Configure VLAN2~7mapping to STP instance 5

QTECH(config)#spanning-tree mst instance 5 vlan 2-7

9.4.4 Configure MSTP netbridge priority

In MSTP, netbridge priority is the parameter based on each STP instance. Netbridge priority

and interface path cost determine the topology of each STP instance which construct the base

of link load balance.

Configure it in global configuration mode:

 Configure netbridge priority in MSTP instance

spanning-tree mst instance instance-num priority priority

Example:

! Configure netbridge priority in MSTP instance 4 to be 4096

QTECH(config)#spanning-tree mst instance 4 priority 4096

9.4.5 Configure MSTP interface edge interface status

As SST, interface with edge interface attribution will turn to forwarding if it hasn’t received

STPpacketafter 2 sending periods when link up.

Configure it in interface configuration mode:

 Configure port to be edge port

spanning-tree mst portfast

! Example:

Configure e0/2 to be edge port

QTECH(config-if-ethernet-0/0/2)#spanning-tree mst portfast

9.4.6 Configure MSTP interface link type

There are two types of link: one is sharing media (through hub), the other is point-to-point. Link

type is used in suggest-agree mechanism of interface fast shifting. Only point-to-point allows

fast shift. Link type can be manual configured or self-detected by STP protocol.

Configure it in interface configuration mode:

 Configure detection of link type

spanning-tree mst link-type point-to-point { forcetrue | forcefalse | auto }

! Example

Configure link type of e0/2 to be point-to-point

QTECH(config-if-ethernet-0/0/2)#spanning-tree mst link-type point-to-point for

cefalse

9.4.7 Configure MSTP interface path cost

Port path cost can be divided into internal cost and external cost. The former is the

configuration parameter based on each MSTP instance to determine topology of different