R3303-HP HSR6800 Routers Layer 2 - LAN Switching Configuration Guide

Figure 24 TC snooping application scenario

In the network, the IRF fabric transparently transmits the received BPDUs and does not participate in

spanning tree calculations. When a topology change occurs to the IRF fabric or user networks, the IRF

fabric might need a long time to learn the correct MAC address table entries and ARP entries, resulting

in long network disruption. To avoid the network disruption, you can enable TC snooping on the IRF

fabric.

When TC snooping is enabled, a device actively updates the MAC address table entries and ARP entries

upon receiving TC-BPDUs, so that the device can forward user traffic correctly.

For more information about MAC address table entries, see "Configuring the MAC address table." For

more information about ARP, see Layer 3—IP Services Configuration Guide.

Configuration restrictions and guidelines

• TC snooping and STP are mutually exclusive. You must disable the spanning tree feature globally

before you enable TC snooping.

• TC snooping does not take effect on the ports on which BPDU tunneling is enabled for spanning tree

protocols. For more information about BPDU tunneling, see "Configuring BPDU tunneling."

Configuration procedure

Ste

Command

Descri

tion

1. Enter system view. system-view N/A

2. Disable the spanning tree

feature globally.

undo stp enable

By default, the spanning tree

feature is disabled globally.

3. Enable TC snooping.

stp tc-snooping

By default, TC snooping is

disabled.