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Knowledge Base

A Link Connecting Two CE Switches Fails

Publication Date:  2019-05-14  |   Views:  195  |   Downloads:  0  |   Document ID:  EKB1100015232

Contents

Issue Description

Networking overview:

After configurations are performed, optical modules are inserted, and optical fibers are installed, a link between the leaf switch CE6851 and the spine switch CE12808 fails, and the links on other interfaces are normal.

Handling Process

1. Ping the CE6851 and CE12808 from each other. The ping fails.
2. Check the interface status. It is found that the corresponding interface is in Error-Down state. Then, check the interface configuration. It is found that the IP address and route configuration are correct. Therefore, device configuration errors can be ruled out.

It is suspected that the hardware is faulty.

Remove the optical fiber of the faulty link, and observe the fiber ports. No optical signal is transmitted between the two ends. The possible causes are as follows:
The optical modules at both ends are faulty.
The optical fiber is disconnected.
The card is faulty.
According to the occurrence probability and troubleshooting difficulty, check the optical modules, optical fiber, and card in sequence.

3. Check whether the optical modules on the faulty ports are working properly. Because there is no redundant optical module at the site, remove optical modules of normal ports and insert the optical modules into the faulty ports. It is found that the link is still unavailable and no optical signal is transmitted between the two ends. This indicates that the original optical modules on the faulty ports function properly.
4. Check whether the optical fiber is normal. Remove the optical fiber and optical modules at both ends of a normal link and insert them into the faulty ports. It is found that the optical signal is transmitted between the two ends and the link is recovered.

According to the preceding analysis, the fault is caused by optical fibers.

Root Cause

According to the handling process, the optical fiber is faulty and therefore the link is unavailable.

Solution

Replace the faulty optical fibers with new ones.

Suggestions

If similar faults occur, check the port configurations first. If the configurations are correct, check whether the hardware is faulty, including optical modules, optical fibers, and cards.