LAN port working intermittently

raadms

@stephenw10
this what I got when running the command i see port1 is different although I could not recall changing it. could it be the reason?
===group

etherswitch0: VLAN mode: DOT1Q
port0:
        pvid: 1
        state=8<FORWARDING>
        flags=1<CPUPORT>
        media: Ethernet 1000baseT <full-duplex>
        status: active
port1:
        pvid: 4092
        state=8<FORWARDING>
        flags=0<>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
port2:
        pvid: 4091
        state=8<FORWARDING>
        flags=0<>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
port3:
        pvid: 4090
        state=8<FORWARDING>
        flags=0<>
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active
vlangroup0:
        vlan: 1
        members 0
vlangroup1:
        vlan: 4090
        members 0t,3
vlangroup2:
        vlan: 4091
        members 0t,2
vlangroup3:
        vlan: 4092
        members 0t,1
vlangroup4:
        vlan: 10
        members 0t,3t
vlangroup5:
        vlan: 100
        members 0t,2t

===

johnpoz

@raadms said in LAN port working intermittently:

media: Ethernet 1000baseT <full-duplex>

~~Yeah that really should be auto..~~

edit: My bad, that is the uplink.. that is fine being like that.

stephenw10

@raadms said in LAN port working intermittently:

media: Ethernet autoselect (100baseTX <full-duplex>)

It's set to autoselect and it's negotiated 100M-FD with the connected device, the TV I assume.

That's expected.

If port 2 won't negotiate with anything but the AP you could switch the VLAN assignments with port1 or just reassign OPT to VLAN 4091.

What devices do you need to connect there?

Has this just failed after working previously?

Steve

stephenw10

@johnpoz That's the internal link to the CPU, it's fixed.

johnpoz

@stephenw10 oh your right my bad... Thought that was his interface.. Will edit..

raadms

@stephenw10

I have changed the interfaces and same behavior on Lan port it is only working with the AP or any other routers not accepting switches nor PCs.

Again I appreciate all your supports @stephenw10 @johnpoz @Gertjan much appreciated

stephenw10

Ok so it's the physical port labelled LAN is seeing this no matter which interface is assigned to it?

raadms

@stephenw10
yes exactly it is teasing. I would say it is a hardware issue but how come it works with routers and APs. I am wondering what is the root cause. so, any ideas what do you think might casing such an issue.

stephenw10

Mmm, indeed the ports are identical as far as I know or should be at least. Hard to see how it would fail to link on one port only.

What is the history here? Was it working previously?

Can you use that port as the WAN interface?

Steve

raadms

@stephenw10
Actually no history behind it. I bough the device like way back everything was fine. But I was not able to use it due to connectivity issue where my home was running on 5G internet and not able to make the 5G router as a bridge mode. So I stored the device back on the cabinet till this year where I got my fiber internet and I am able to make me sg1100 get the public my IP. It was working fine back on Jan this year I connect my LAN to my pc and configured it then hooked it to my AP since then. Yesterday I got my switch and find out that the LAN only works when I connect router or AP.

And I have not used that port as wan I will try it.

Thank you,

raadms

@stephenw10 so is there a way to flush these ports or is it possible to change the network card on te SG-1100?

stephenw10

I'm not sure what you mean by 'flush' the ports.
It's not possible to change the NICs in the 1100. They are all on the main board directly.

Steve

raadms

@stephenw10 I mean if there is some sort of a special port format like hard reset?
And is there a way to test the port by an external device like thermometer used for the electricity. Like a device to connect to it and check if there is any faulty components on the port?

stephenw10

The ports on the 1100 are all connected via the on-board switch chip. It loads default values when it powers up so you might try a full power cycle (actually pull the power lead).

The only thing I could imagine would be physical damage to one or more pins in the port. Gigabit requires all 8 connections but the link negotiation only uses 4 pins. Some devices will link at 1G when they have lost some connections but then fail to pass traffic.

Steve

raadms

@stephenw10 Actually it make sense, so how can I verify if all 8 bins are faulty or working and to second you yup my switch is a gigabit switch. I have taken the below pic IDK if it would makes any difference the LAN has the two led light on and the opt only one light.

photo_2022-03-31_20-48-10_LI (2).jpg

stephenw10

The OPT interface there is linked at 100M which is why it only shows one LED. I assume it's connected to the TV still?

I would physically inspect the port. We have seen pins get bent across by bad plugs or some other object being inserted. Sometimes the pins can simply be moved back.
However if it is linked with 2 pairs only I would expect it to fail to pass at 1G when the AP is connected.

Steve