Qtech QSW-3200-24T [81/146] Configure spanning tree root guard

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In IEEE 802.1D, the default path cost is determined by the speed of the interface. The port

with the speed 10M have the cost of 100, 100M, 19; 1000M, 4.

9.2.9 Configure STP priority od specified port

Specify specified port in STP by configuring port priority. Generally, the smaller the value is,

the superior the priority is, and the port will be more possible to be included in STP. If the

priorities are the same, the port number is considered. Configure it in interface configuration

mode:

 Configure port priority

spanning-tree port-priority port-priority

 Restore the default port priority

no spanning-tree port-priority

The smaller the value is, the superior the priority is, and the port is easier to be the root

interface. Change the port priority may cause the re-calculating of the STP. The port priority

ranges from 0 to 255. the default port priority is 128.

For example:

! Configure the port priority of Ethernet 0/1 in STP to 120

QTECH(config-if-ethernet-0/1)#spanning-tree port-priority 120

9.2.10 Configure spanning-tree 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 root-guard

spanning-tree root-guard

 restore to default root-guard

no spanning-tree root-guard

Example:

! Enable mst root-guard of e0/1

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

9.2.11 Configure interface to force to send rstp packet

This configuration is used to check whether there is traditional network bridge running STP.

Configure it in interface configuration mode:

 Configure interface to force to send rstp packet

spanning-tree mcheck

For example:

! Configure Ethernet 0/1 to send RSTP packet

QTECH(config-if-ethernet-0/1)#spanning-tree mcheck

9.2.12 Configure link type of specified interface

In rstp, the requirement of interface quickly in transmission status is that the interface must be

point to point link not media sharing link. It can specified interface link mode manually and can

also judge it by network bridge.

Configure it in interface configuration mode:

 Configure interface to be point-to-point link