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Issue when connecting an S6720 to the server

Latest reply: Oct 14, 2019 02:40:43 275 3 3 0

This post highlights an issue when connecting an S6720 to the server. Please read further down for more details.

There is an issue connecting the switch to the server - after restarting the server, the port of the switch which was connected is staying down.

The switch connected to the server via a Huawei SFP+ Passive cable was experiencing issues after the server had been restarted.

After the server has restarted, the connection to the same port is impossible - the port is staying down and is working only when changing it with another port.

Also, a lot of Auto port-defend logs with the Attack Protocol as ARP-REQUEST are spotted.



The issue was on the switch that was using the Huawei SFP+ Passive cable (copper). The copper cables should not be used for connecting with any devices other than another switches from the subseries in a stack module.


The fix to this issue was that, in this case, an optical module should be used for the switch connection to the server. This doesn't have any issues because they were designed for this.


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Created Oct 14, 2019 01:43:56 Helpful(0) Helpful(0)

Hello daniix, thanks for the excellent case. But I got a question, what is the reason for the ARP request attack?
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MVE Created Oct 14, 2019 02:40:43 Helpful(0) Helpful(0)

Thanks for sharing. If we have to connect to server 10G BaseT port of server, how can we do that then?
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daniix Created Oct 15, 2019 06:54:16
For the 10G Base-T, a different version of the switch would be needed, this case is about S6720LI, a different model of the switch would be needed as per example S6720-52X-PWH-SI which has an interface card for this :

100M/1000M/2.5G/5G/10G BASE-T port (MultiGE port)

Attributes of a 100M/1000M/2.5G/5G/10G BASE-T port
Connector type : RJ45

Standards compliance : IEEE802.3u, IEEE802.3ab, IEEE802.3bz, IEEE802.3an, mgbase-t

Working Mode : 100/1000/2500/5000/10000 Mbit/s auto- 


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