R2511-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V5)

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• Connect a device to a third-party upstream device that supports spanning tree protocols with 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
To make the No Agreement Check feature take effect, enable it on the root port.
To configure No Agreement Check:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface or port
group view.
• Enter Ethernet interface view or Layer 2
aggregate interface view:
interface interface-type interface-number
• Enter port group view:
port-group manual port-group-name
Use one of the commands.
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 21:
• 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 21 Network diagram
Configuration procedure
# Enable No Agreement Check on Ethernet 1/1 of the router.
<RouterA> system-view
[RouterA] interface ethernet 1/1
[RouterA-Ethernet1/1] stp no-agreement-check
Eth1/1
Router Device
Eth1/1
Root port Designated port
Root bridge