The tc-protection interval command sets the interval for suppressing topology change (TC) notification packets.
The undo tc-protection interval command restores the default interval for suppressing TC notification packets.
By default, the interval for suppressing TC notification packets is 2s.
| Parameter | Description | Value |
|---|---|---|
| interval-value | Specifies the interval for suppressing TC notification packets. A longer interval ensures stable SEP operating but deteriorates convergence performance. |
The value is an integer that ranges from 1 to 10, in seconds. |
Usage Scenario
Assume that a host is connected to an upstream network through three or more SEP networks. If the topology of the SEP network nearest to the host changes, doubled TC notification packets are flooded on the upper-layer SEP network. Each time TC notification packets pass through a SEP segment, TC notification packets will be doubled. The upstream network will receive multiple duplicate TC notification packets.
Frequent topology change notifications reduce the CPU packet processing capability, and cause devices in the SEP segments to frequently refresh MAC address entries, which consumes bandwidth resources. To address the problem, run the tc-protection interval command to suppress TC notification packets.
Prerequisites
The sep segment command has been used to create SEP segments.
Precautions
After this command is used, the upstream network only needs to process one TC notification packet but not multiple duplicate TC notification packets. In addition, this function protects devices on the SEP segment against TC attacks.