H3C Technologies H3C S5560 Series Switches - Manual (Page 133)

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Figure 30 TC Snooping application scenario
To avoid traffic interruption, you can enable TC Snooping on the IRF fabric. After receiving a TC-BPDU
through a port, the IRF fabric updates MAC address table and ARP table entries associated with the
port's VLAN. In this way, TC Snooping prevents topology change from interrupting traffic forwarding in
the network. For more information about the MAC address table and the ARP table, see "Configuring the
MAC address table" and Layer 3—IP Services Configuration Guide.
Configuration restrictions and guidelines
When you configure TC Snooping, follow these restrictions and guidelines:
• TC Snooping and the spanning tree feature are mutually exclusive. You must globally disable the
spanning tree feature before enabling TC Snooping.
• TC Snooping does not support the PVST mode.
Configuration procedure
To enable TC Snooping:
Step Command Remarks
1. Enter system view. system-view N/A
2. Globally disable the
spanning tree feature.
undo stp global enable
• If the device starts up with the initial
settings, the spanning tree feature is
disabled globally by default.
• If the device starts up with the factory
defaults, the spanning tree feature is
enabled globally by default.
For more information about the startup
configuration, see Fundamentals
Configuration Guide.
3. Enable TC Snooping. stp tc-snooping By default, TC Snooping is disabled.