Configuration Restrictions And Guidelines; Configuration Procedure; Configuring Protection Functions; Configuration Prerequisites - H3C S3600V2 SERIES Layer 2-Lan Switching Configuration Manual

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 may 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.
With TC snooping enabled, a device actively updates the MAC address table entries and ARP entries
upon receiving TC-BPDUs, so that the device can normally forward the user traffic.
For more information about MAC address table entries, see
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 globally disable the spanning tree feature
•
before 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
TC snooping does not support PVST TC-BPDUs. As a result, TC snooping does not take effect on a
•
PVST network.

Configuration procedure

To configure TC snooping:
Step
1. Enter system view.
2. Globally disable the
spanning tree feature.
3. Enable TC snooping.

Configuring protection functions

A spanning tree device supports the following protection functions:
BPDU guard
•
Root guard
•
Loop guard
•
TC-BPDU guard
•
• BPDU drop

Configuration prerequisites

The spanning tree feature has been correctly configured on the device.

Enabling BPDU guard

For access layer devices, the access ports can directly connect to the user terminals (such as PCs) or file
servers. The access ports are configured as edge ports to allow rapid transition. When these ports
Command
system-view
undo stp enable
stp tc-snooping
98
"Configuring the MAC address
"Configuring BPDU
Description
N/A
By default, the spanning tree
feature is disabled globally.
Disabled by default.
table."
tunneling."