Command Manual - STP
Quidway S6500 Series Ethernet Switches Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-32
MSTP provides Root protection function to protect the root bridge: The port configured
with Root protection only plays a role of designated port on every instance. Whenever
such port receives a higher-priority BPDU, it will be set to listening state and not forward
packets any more (as if the link to the port is disconnected). If the port has not received
any higher-priority BPDU for a certain period of time thereafter, it will resume the normal
state.
For the related command, see stp interface root-protection.
Example
# Enable Root protection on the Ethernet2/0/1 port of the switch.
[Quidway-Ethernet2/0/1] stp root-protection
1.1.35 stp tc-protection
Syntax
stp tc-protection enable
stp tc-protection disable
View
System view
Parameter
None
Description
Using the stp tc-protection enable command, you can enable the protection function
from being attacked by TC-BPDU packets on the switch. Using the stp tc-protection
disable command, you can disable the protection function.
By default, the protection from TC-BPDU packet attack is enabled.
As a general rule, the switch deletes the corresponding entries in the MAC address
table and ARP table upon receiving TC-BPDU packets. When under malicious attacks
of TC-BPDU packets, the switch shall receive a great number of TC-BPDU packets in a
very short period. Too frequent delete operations shall consume huge switch sources
and bring great risk to network stability.
When the protection from TC-BPDU packet attack is enabled, the switch just perform
one delete operation in a specified period after receiving TC-BPDU packets, as well as
monitoring whether it receives TC-BPDU packets during this period. Even if it detects a
TC-BPDU packet is received in a period shorter than the specified interval, the switch
shall not run the delete operation till the specified interval is reached. This can avoid
frequent delete operations to the MAC address table and ARP table.
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