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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 12, 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 26 Network diagram
Configuration procedure
# Enable No Agreement Check on GigabitEthernet 1/0/1 of Device A.
<DeviceA> system-view
[DeviceA] interface gigabitethernet 1/0/1
[DeviceA-GigabitEthernet1/0/1] stp no-agreement-check
Configuring TC Snooping
As shown in Figure 13, an IRF fabric connects to two user networks through double links.
• Device A and Device B form an IRF fabric.
• The spanning tree feature is disabled on Device A and Device B and enabled on all devices in
user network 1 and user network 2.
• The IRF fabric transparently transmits BPDUs for both user networks and is not involved in the
calculation of spanning trees.
When the network topology changes, it takes time for the IRF fabric to update its MAC address table
and ARP table. During this period, traffic in the network might be interrupted.
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