How to handle the CRC errors? Highlighted

Latest reply: Oct 30, 2018 08:37:17 1664 11 11 0

This post describes the process of how to handle the CRC errors. Please have a look below to find the solution.


Issue description


Fault diagnostic: The switch is reporting a lot of CRC errors on some interfaces and some packets are lost due to this issue.


You can use display interface xxxx to check the CRC errror statistics.


Solution


Most probably, the CRC issue is caused by the hardware part, as it is not a software issue. There are some reasons which can cause the CRC issue, such as the transceiver not being inserted tightly, the fiber or cable being twisted too much, the transceiver being unstable, or the hardware of this port being unstable on the switch.

To handle the CRC issue, the best way is to do the cross-test:


1. firstly check the transceiver and fiber to see if they are tightly connected. You can plug out and plug in to test again;


2. move the transceiver to other ports on the switch; if the CRC still persists, it means that the CRC is related to the transceiver or fiber. If CRC disappears, it means that maybe the hardware of this port is unstable. We can find another good transceiver to test again if the CRC still happens even if we replace with another good transceiver. In this case, we can replace the switch;


3. after step 2, if the CRC still occurs even after moving to other ports, it means that this may be related to a transceiver issue. We can replace it with another good transceiver; if the CRC disappears, then it's related to the faulty transceiver.\


CRC may be related to a peer device also in case that the transceiver is not connected to peer switch tightly or the hardware of the port is unstable on peer switch. We can find another good transceiver to test on the peer switch; if the CRC still happens even if we test with another good transceiver, we can say the hardware of this port is unstable.


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littlestone
Created Oct 23, 2018 04:07:04 Helpful(0) Helpful(0)

Determine the forwarding mode of packets.
  • For CE8800&CE7800&6800&5800 series switches exclude CE6870EI and CE6875EI, hash modes can be configured for known and non-known unicast packets separately. First check whether packets are known or non-known unicast packets
This post was last edited by littlestone at 2018-10-31 06:08.
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GongXiaochuan
Created Oct 27, 2018 06:18:55 Helpful(0) Helpful(0)

if can provide the command how to check the CRC error would be much better

This post was last edited by GongXiaochuan at 2018-10-30 06:14.
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Good Good Study Day Day Up
w1
Created Oct 30, 2018 08:37:17 Helpful(0) Helpful(0)

Good case, CRC issue is a very common issue, more device and situation will experience this issue, this post is very useful for guiding us to check the CRC issue, thanks for your sharing, it is a good post
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