478 CHAPTER 23: MSTP C ONFIGURATIONupstream device and thus sends no agreement packets to the upstream device. Asa result, the designated port of the upstream device fails to transit rapidly and canonly change to the Forwarding state after a period twice the Forward Delay.In this case, you can enable the No Agreement Check feature on the downstreamdevice’s port to perform rapid state transition.Prerequisites ■ A device is the upstream one that is connected to another vendor’s MSTPsupported device via a point-to-point link.■ Configure the same region name, revision level and VLAN-to-instancemappings on the two devices, making them in the same region.Configuration Procedure Following these steps to configure No Agreement Check:n The No Agreement Check feature can only take effect on the root port orAlternate port after enabled.Configuration Example Network requirements■ Device A connects to a third-party’s device that has a different MSTPimplementation. Both devices are in the same region.■ The third-party’s device is the regional root bridge, and device A is thedownstream device.Network diagramFigure 135 No Agreement Check configurationTo do... Use the command... RemarksEnter system view system-view -Enter Ethernetinterface viewor port groupviewEnter Ethernetinterface viewinterface interface-typeinterface-numberUser either commandConfigured in Ethernetinterface view, the setting iseffective on the current portonly; configured in portgroup view, the setting iseffective on all ports in theport group.Enter portgroup viewport-group { manualport-group-name |aggregation agg-id }Enable No Agreement Check stp no-agreement-check RequiredNot enabled by defaultRoot portDesignated portEth 1/1Eth 1/0Device AThird-party device
