H3C Technologies H3C S12500-X Series Switches - Manual (Page 103)

92
device receives no agreement packet from the upstream device and sends no agreement packets to the
upstream device. As a result, the designated port of the upstream device fails to transit rapidly, and can
only change to the forwarding state after a period twice the Forward Delay.
You can enable the No Agreement Check feature on the downstream device's port to enable the
designated port of the upstream device to transit its state rapidly.
Configuration prerequisites
Before you configure the No Agreement Check function, complete the following tasks:
• Connect a device to a third-party upstream device that supports spanning tree protocols through a
point-to-point link.
• Configure the same region name, revision level and VLAN-to-instance mappings on the two devices,
assigning them to the same region.
Configuration procedure
Enable the No Agreement Check feature on the root port.
To configure No Agreement Check:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet or
aggregate interface view.
interface interface-type interface-number N/A
3. Enable No Agreement
Check.
stp no-agreement-check
By default, No Agreement
Check is disabled.
No Agreement Check configuration example
Network requirements
As shown in Figure 24 :
• Device A connects to a third-party device that has a different spanning tree implementation. Both
devices are in the same region.
• The third-party device (Device B) is the regional root bridge, and Device A is the downstream
device.
Figure 24 Network diagram