l The smaller the interval-value is set, the sooner the edge port becomes Up, and the more
frequently the edge port alternates between Up and Down.
l The larger the interval-value is set, the later the edge port becomes Up, and the longer the
service interruption lasts.
8.4.3 Configuring TC Protection on a Switching Device
After TC protection is enabled, you can set the number of times for a switching device to process
TC BPDUs within a given time. TC protection avoids frequent deletion of MAC address entries
and ARP entries, thereby protecting switching devices.
Context
An attacker may send pseudo TC BPDUs to attack switching devices. Switching devices receive
a large number of TC BPDUs in a short time and delete entries frequently, which burdens system
processing and degrades network stability.
TC protection is used to suppress TC BPDUs. The number of times that TC BPDUs are processed
by a switching device within a given time period is configurable. If the number of TC BPDUs
that the switching device receives within a given time exceeds the specified threshold, the
switching device handles TC BPDUs only for the specified number of times. Excess TC-BPDUs
are processed by the switching device as a whole for once after the specified time period expires.
This protects the switching device from frequently deleting MAC entries and ARP entries, thus
avoiding overburden.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
stp tc-protection
TC protection is enabled for a switching device.
By default, TC protection is enabled on the switching device.
Step 3 Run:
stp tc-protection threshold threshold
The threshold of the number of times the switching device handles the received TC BPDUs and
updates forwarding entries within a given time is set.
NOTE
The value of the given time is consistent with the RSTP Hello time set by using the stp timer hello hello-
time command.
----End
8.4.4 Configuring Root Protection on a Port
The root protection function on a switching device protects a root bridge by preserving the role
of a designated port.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 8 STP/RSTP Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
403
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