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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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Heartbeat Packets of Storage Devices Are Lost on the CE12808

Heartbeat Packets of Storage Devices Are Lost on the CE12808

Fault Symptom and Networking

Two storage devices are connected through a CE12808. Heartbeat packets of storage devices are forwarded by the switch at Layer 2.

After storage devices are powered on, they cannot receive heartbeat packets from each other. The Ethernet type of the heartbeat packets is user-defined. Storage engineers think that the CE12808 filters out the heartbeat packets.

Root Cause

By default, STP is enabled on the CE12808, and the initial state of Up interfaces is blocking. Storage devices do not support STP. As a result, the interfaces connecting the CE12808 to the storage devices cannot receive STP bridge protocol data units (BPDUs) after going Up. The interfaces enter the learning state after 15 seconds and then the forwarding state after another 15 seconds. Storage devices send only four heartbeat packets upon startup. As a result, storage devices fail to receive heartbeat packets from each other.

Fault Identification

  1. Determine the packet format, use the tester to construct the same packets, and send the packets to the CE12808. Packets can be correctly forwarded by the CE12808.
  2. Understand the heartbeat packet exchange mechanism, and determine that only four packets are sent after device power-on.
  3. Check the configuration of the CE12800, and check that STP is disabled on the interface connected to the storage device and the interface is not configured as the edge interface.
  4. Disable STP on the interface connected to the storage device. Then services work properly.


Configure interfaces connecting the CE12808 to storage devices as STP edge interfaces.


You are advised to configure interfaces connected to access devices as STP edge interfaces or disable STP on these interfaces.

Updated: 2020-01-07

Document ID: EDOC1000060766

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