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In this case, the following occurs:
1. The root port on the downstream device receives no agreement from the upstream device.
2. It sends no agreement to the upstream device.
As a result, the designated port of the upstream device can transit to the forwarding state only after a
period twice the forward delay.
To enable the designated port of the upstream device to transit its state rapidly, enable No
Agreement Check on the downstream device's port.
Restrictions and guidelines
Configure No Agreement Check on the root port of your device, because this feature takes effect
only if it's configured on root ports.
Prerequisites
Before you configure the No Agreement Check feature, 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.
Procedure
Enable the No Agreement Check feature on the root port.
1. Enter system view.
system-view
2. Enter interface view.
interface interface-type interface-number
3. Enable No Agreement Check.
stp no-agreement-check
By default, No Agreement Check is disabled.
Configuring TC Snooping
About TC Snooping
As shown in Figure 18, an IRF fabric connects to two user networks through double links.
• Device A and Device B form the 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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