Enterprise

Community Forums Switches

Issue when connecting an ...

Issue when connecting an S6720 to the server

Created: Oct 11, 2019 06:32:37Latest reply: Oct 14, 2019 02:40:43 99 3 3 0

display all floors ^#1

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.

bca155a92eed47c7b3a230911cf9bdb8

Solution

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.

ff48039e3a6b426fa9827c91b60a12f0 736d49f9a6a849c795f5e6878eba7ca1

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.

38c8a601066346428a5b383810f46803 a63ad47a66a44c56920ae02638160617

Conncetion issue S6720 port-security port not working port not working up port down after restart

x
convention：

Helpful (3) Favorite(0) Report

user_3445655 Created Oct 14, 2019 01:43:56

Hello daniix, thanks for the excellent case. But I got a question, what is the reason for the ARP request attack?

x
convention：

umaryaqub

MVE Created Oct 14, 2019 02:40:43

Thanks for sharing. If we have to connect to server 10G BaseT port of server, how can we do that then?

x
convention：

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 Attribute 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-

Comment

Notice

Notice: To protect the legitimate rights and interests of you, the community, and third parties, do not release content that may bring legal risks to all parties, including but are not limited to the following:

Politically sensitive content
Content concerning pornography, gambling, and drug abuse
Content that may disclose or infringe upon others ' commercial secrets, intellectual properties, including trade marks, copyrights, and patents, and personal privacy

Do not share your account and password with others. All operations performed using your account will be regarded as your own actions and all consequences arising therefrom will be borne by you. For details, see " Privacy."