H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 194)

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and does not support RSTP mode, the root port on the downstream device receives no agreement
packet from the upstream device and thus sends no agreement packets to the upstream device. As a
result, the designated port of the upstream switch fails to transit rapidly and can only 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 downstream device’s port to
perform rapid state transition.
Prerequisites
z
A device is the upstream one that is connected to another vendor’s MSTP supported device via a
point-to-point link.
z
Configure the same region name, revision level and VLAN-to-instance mappings on the two
devices, making them in the same region.
Configuration Procedure
Follow these steps to configure No Agreement Check:
To do... Use the command... Remarks
Enter system view system-view —
Enter Ethernet
interface view interface interface-type
interface-number
Enter Ethernet
interface or port
group view
Enter port group
view
port-group { manual
port-group-name | aggregation
agg-id }
Required
Use either command.
Configurations made in Ethernet
interface view will take effect on
the current port only;
configurations made in port group
view will take effect on all ports in
the port group.
Enable No Agreement Check stp no-agreement-check
Required
Not enabled by default
The No Agreement Check feature can only take effect on the root port or Alternate port after enabled.
Configuration Example
Network requirements
z
AC connects to a third-party device that has different MSTP implementation. Both devices are in
the same region.
z
The third-party device is the regional root bridge, and AC is the downstream device.