Weird Switch Issue

LockDown32
LockDown32 used Ask the Experts™
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I have a customer that has a weird issue going on. He has a network printer right next to his computer. To make a long story short the printer will disappear on him (unable to ping) and if he un-plugs the cable from the switch it will come back.

   It is an old Netgear 10/100 8-port. So.... I replaced it with a decent HP Office Connect 10/100/1000 and this is where is gets strange. The "main" cable going to another switch will not connect and give a link light when plugged in to the new switch.

   His computer give a link light on the switch, the printer give a link light on the switch but the main cable to the rest of the network will not give him a link light. I can plug it back in to the old Netgear switch switch and a link light will come on. Just not in the new HP switch. Switching ports doesn't help.

   I am at a loss on this one.....
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Business Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
1. Printer:  Give it a static IP address (or a reserved address on a Server) to alleviate the printer issues. If it is disconnecting AND on DHCP, it may be changing addresses.

2. Switch:  Try connecting to a different point (use a longer cable temporarily if need be). It sounds like the new switch may be too modern for your base network gear.
Brian BEE Topic Advisor, Independant Technology Professional
Commented:
A couple of spin off ideas from Johns point #2:

The cable itself could also be the problem. So worth checking that as well.
Check the port settings on the two switches. Normally the speed and duplex should be set for "automatic". Perhaps the main switch had different settings to accommodate the old switch.
LockDown32Owner
Top Expert 2016

Author

Commented:
The printer is static IPed. The base network gear is very modern. This one segment is a little odd. Everything starts with a 50-port HP 1920 (maybe two years old). Then to get to this problem endpoint it first goes to one HP Office Connect 8-port (new) then arrives and this endpoint which has another new HP Office Connect 8-port (the one that I can't get a link LED on). Very frustrating. I am not thrilled about the 8-port switches but they should work.
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LockDown32Owner
Top Expert 2016

Author

Commented:
The 8-port HP Office Connects aren't managed. By default the speeds are auto. That is what is throwing me. The problem link is from one HP to another. I am having maintenance check the cables but I would think that if it were a flaky cable that the main 1920 switch should pick up a lot of errors on that port.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
I suggested another network port earlier. Get a 25-foot (whatever) brand new network cable, and connect the HP Switch to an entirely different network segment.
LockDown32Owner
Top Expert 2016

Author

Commented:
Can't do it. It is the only incoming network connection for 150 feet. Have to debug what is there,
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
The suggestions above (according to you) did not help. 150 feet is but 50 meters and 1/2 the legitimate Ethernet length. So for the cost of cable, consider my suggestion.

I have debugged such cables by installing new RJ45 ends, so I have worked with this length.
Brian BEE Topic Advisor, Independant Technology Professional
Commented:
I think John is on the right track. Actually, if you have a cable tester it would be worth making sure this cable is good. Not a continuity tester that just checks your wires are connected to the right pins, but a device that actually checks for noise and the quality of the wires themselves.
Distinguished Expert 2018
Commented:
His computer give a link light on the switch, the printer give a link light on the switch but the main cable to the rest of the network will not give him a link light. I can plug it back in to the old Netgear switch switch and a link light will come on. Just not in the new HP switch. Switching ports doesn't help.
While it shouldn't come into play, did you make sure that port security is either disabled or allowing the correct number of devices on the port if the main switch?

Also, did you ever try connecting a device to the cable directly? And if so, was that one device able to connect to the network without issue?

And as mentioned several times in the previous messages: check the cable.
LockDown32Owner
Top Expert 2016

Author

Commented:
I am going to let their maintenance department worry about it.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Thanks for the update.

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