What Are the Common Causes for STP Flapping?

Latest reply: Nov 9, 2016 15:49:59 2629 5 0 0

The packet change and timer timeout repeatedly triggers recalculation and makes network switches constantly repeat the following process: 1. Root bridge selection; 2. Port role switch; 3. Port status migration. Repetition of this process for many times is called STB flapping, which cannot be converged.

The common causes are as follows:
  • Link fault: The link attributes such as the port status, rate, and duplex mode of a port on the network constantly change.
  • Node fault: A switch has high CPU usage and cannot send or process STP packets at specified intervals.
  • Network fault: The network is congested, making the STP packets in the direction of root port be discarded in the process of forwarding. L2PT transparently transmits STP packets of other networks, making the STP of the port converge mistakenly. The multicast suppression function is incorrectly configured on the network, making STP packets be discarded occasionally.
Modify configuration or optimize the network design based on different causes to rectify the STP flapping.

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Nana00
Created Mar 9, 2016 01:30:02 Helpful(0) Helpful(0)

Thank you for sharing.
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SherryL
Created Mar 7, 2016 05:41:18 Helpful(0) Helpful(0)

Thank you.
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ictofsajjad
Created Oct 1, 2016 12:20:59 Helpful(0) Helpful(0)

if ONE-WAY link fault occurs & LOOP PROTECTION feature is not configured... ""ictofsajjad""
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Entrepreneur
Created Oct 25, 2016 07:50:03 Helpful(0) Helpful(0)

Thanks for sharing!
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CippaLippa
Created Nov 9, 2016 15:49:59 Helpful(0) Helpful(0)

Thank you for sharing.
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