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DES-7200 Configuration Guide Chapter 8 TPP Configuration
8-2
As shown in the above dual-core topology, A and B are the L3 convergence devices,
and C and D are the L2 access devices. A is the MSTP root bridge. The topology
protection functions of all the devices are enabled.
The CPU of the L3 convergence device A is extremely busy due to network attack,
resulting in that the BPDU packets cannot be sent. The topology protection function
detects the exception and sends the exception advertisement packet to its neighbors.
B, C, and D all receive the advertisement and adopt the anti-vibration measures.
The CPU of B is extremely busy under the attack of a large number of packets and
cannot send or receive packets normally. After detecting the exception, B sends the
exception advertisement to all its neighbors. A receives the exception advertisement
but does not process it further because B finds the exception has not effect on B
according to its source. The downstream C and D receive the exception advertisement
and perform further defense activities to ensure the reliability of the network topology,
because they find the exception will affect the topology calculation.
8.3 TPP Configuration
Configuring TPP involves global function configuration and port function configuration.
The global function configuration is used to enable the topology protection function of
the device. By default, the global topology protection function is enabled. Here, it will
detect the running conditions of the local and neighbor devices and perform treatment
for the abnormities that occur. However, it does not notify the local running conditions
to neighbor devices. The port function configuration is used to enable the topology
protection function of the port. When the topology protection function is enabled on the
port, it indicates that the opposite neighbor device is concerning about the running
conditions of this machine. When the local device becomes abnormal, this will be
notified to the opposite neighbor device of the port. By default, the topology protection
function is disabled on all ports.