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switch status error troubleshooting

I have 2 HP managed switch. Checked the status and found there are couple of errors as in the screenshot.
I don't understand some of the advices mean there, for ex: half/full duplex mismatch. If i have switch set to auto and workstation set to auto, does half/full duplex mismatch apply to my situation?

And for the excessive boradcast on the other switch, it says it's usually caused by a network topology loop... what is network topology loop?

switch1
switch2
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okamon
Asked:
okamon
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1 Solution
 
fgasimzadeCommented:
Regarding the first error it probably means there is something wrong with the cable or jack. Duplex mismatch with both interfaces set to auto might indicate, that NIC is not functioning properly (drivers error or NIC hardware)

Regarding topology loop - what is connected to po 19?

Topology loop means some switches are connected with a loop topology, for example Switch1 connected to Switch2, Switch 2 connected to Switch 3 and Switch connected back to Switch 1.
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ping2vohraCommented:
First error is related to cables or connected issue or set mannual speed on both switch port and end devices port. Its also happen if nic driver is not updated.

2. Error is not a normal error. its something is wrong with switch provide your network diagram. check end point devices and run anti virus on it. may be it sending malfunction packet to network

do one thing ..go into interface
example
Int 19
no lacp
exit
spanningtree 19 bpdu-protection
spanningtree bpdu-protection-timeout 60

if it is recieving some unknown bpdu packet so it will stop.
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okamonAuthor Commented:
thanks! so what is the recommanded switches connection? star topology? for ex, I have 4 switches. I should use one as main switch and the rest should be all connected to the main switch directly?

If I set the duplex manually, what is the best practice? ex, if I set the workstation to 100 full duplex then the connected switch port also need to be set to 100 full duplex? And how about if I set one auto and the other set to manual? same for flow control? if I set it to disable on the switch port, and I set the device to enable. will it ignore it?
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mikebernhardtCommented:
Star topology is very common and works well. If the switches are running spanning tree, then you can connected them in a loop, but one of the links will block. The most likely cause of excessive broadcasts is a bad NIC or even some kind of malware on one of the computers.

The best way to set speed and duplex these days is to make sure that everything is set to auto. If you set one side manually to full duplex, you MUST manually set the other side to full duplex. When you manually set a port, it will not negotiate with the other side. When there is no negotiation, a port set to auto will always set itself to half duplex. That duplex mismatch will cause tons of collisions and CRC errors as a result.

If you are sure that both sides are set to auto, then the errors can easily be due to a bad cable or electromagnetic interference.
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okamonAuthor Commented:
thanks mikebernhardt, very helpful. Do you knwo any way I can find out which device is connected to which port?
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fgasimzadeCommented:
You can use LLDP somewhere in the menu. LLDP protocol is exchanged between HP switches, they use it to identify themselves to the directly connected switches
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okamonAuthor Commented:
did see that option, probably my doesn't support it. my is hp procurve 2510g-48.
And actually I was talking about workstations not other switches...
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mikebernhardtCommented:
You'll have to look at which MAC address is connected to which ports, and then compare that with the ARP table in a router or a workstation.
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