topic I stand by my suspicion it's in Wireless

Access point ethernet issue

sisbest_ma1 — Mon, 05 Jul 2021 09:15:14 GMT

My Cisco 1252 AG's ehternet port is not working, would you please help me how to fix it. the bvi1 interface up.

If the bvi interface is up/up

Scott Fella — Mon, 12 Jan 2015 13:15:37 GMT

If the bvi interface is up/up, then the Ethernet port is working. You might have another issue.

-Scott

yes the bvi interface is up

sisbest_ma1 — Tue, 13 Jan 2015 08:02:00 GMT

yes the bvi interface is up/up, but not blinking even by the computer side, so what could be the problem, i could not connect to the ap, i just accessed using console port.

Was this ap working before?

Scott Fella — Tue, 13 Jan 2015 13:27:42 GMT

Was this ap working before? Your not connecting directly to the ap are you? Try to replace the Ethernet cable, connect it to a different port on the switch and when looking at the console output, find out if the ap is getting an IP address. We need more info here, so post the output if you can some info that would be nice is boot up the access point and capture the output while the AP is connected to the network. Paste this in a text file and attach it. Don't paste it in the post. Also these commands from the console (CLI):

show version

show ip interface brief

show inventory

-Scott

My Cisco 1252 AG's ehternet

Leo Laohoo — Wed, 14 Jan 2015 07:46:24 GMT

My Cisco 1252 AG's ehternet port is not working, would you please help me how to fix it. the bvi1 interface up.

How are you powering up the AP?

Post the output to the command "sh interface G0".

Please these are the internal

sisbest_ma1 — Wed, 14 Jan 2015 08:28:56 GMT

Please these are the internal configuration of the AP, show version, show ip interface brief and show inventory, i have changed the ethernet cable, for some time the BIV interface waits up and immediately it goes down even i could not connect to my pc to configure it using GUI, could it be hardware problem of the port ? the ap was working nicely before for about three months.

It was powering up using

sisbest_ma1 — Wed, 14 Jan 2015 08:31:26 GMT

It was powering up using power injector.

and here is the sh interface go

GigabitEthernet0 is up, line protocol is down
Hardware is PowerPC 8349 Ethernet, address is c84c.75d4.b39c (bia c84c.75d4.b39c)
Internet address is 10.0.0.4/24
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Full-duplex, 100Mb/s, media type is T
output flow-control is unsupported, input flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:31:41, output 00:01:28, output hang never
Last clearing of "show interface" counters never
Input queue: 0/1677/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
     6 packets input, 480 bytes, 0 no buffer
     Received 6 broadcasts, 0 runts, 0 giants, 0 throttles
     2 input errors, 2 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     249 packets output, 57652 bytes, 0 underruns
     0 output errors, 0 collisions, 4 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

GigabitEthernet0 is up, line

Leo Laohoo — Wed, 14 Jan 2015 09:40:49 GMT

GigabitEthernet0 is up, line protocol is down

Layer 1 is UP. Layer 2, however, is DOWN. So what's your configuration?

This could either be a configuration issue or a cable issue. Is there a switch connected to the AP?

ya there was switch connected

sisbest_ma1 — Wed, 14 Jan 2015 11:30:31 GMT

ya there was switch connected to it. the cable is proper too, but now it is up then later it changes to down, even the bvi1 becomes up, but never connected to the PC, what could be the problem ? it was working fine, i have three ap with this case, please help

To be honest, the problem can

Scott Fella — Wed, 14 Jan 2015 11:50:54 GMT

To be honest, the problem can be with the AP itself. The AP can be going bad and will need to be replaced. If you have a support contract, you can open a TAC case and see if you can get an RMA. I don't know if that model is end of support already or not.

Have you you tried to swap injectors with a access point that it is working? I just had an injector I was using go bad, not the AP.

-Scott

the cable is proper too

Leo Laohoo — Wed, 14 Jan 2015 21:17:52 GMT

the cable is proper too

How confident are you?

If you have the 2nd pair of pins faulty on a cable, you'll get Layer 1 UP but Layer 2 DOWN. Exactly what is the model of the switch?

It it is dlink switch, not

sisbest_ma1 — Thu, 15 Jan 2015 07:07:36 GMT

It it is dlink switch, not even the switch i could not even connect to my computer, there is no signal detecting at all.

I stand by my suspicion it's

Leo Laohoo — Thu, 15 Jan 2015 11:52:12 GMT

I stand by my suspicion it's a cable issue. Otherwise, get the AP RMA-ed.

Alternatively, you can connect your D-Link switch to your laptop/PC and see if you can get a valid link light. If not, then it's a cable issue.

Now it is working, the only

sisbest_ma1 — Fri, 16 Jan 2015 08:17:42 GMT

Now it is working, the only problem is the gigabitethernet maximum speed became 10mb/s, when i change it to 100 or 1000 it shuts down the port immediately, so what is your suggestion, please say sth soon

Now it is working, the only

sisbest_ma1 — Fri, 16 Jan 2015 08:18:18 GMT

Now it is working, the only

Leo Laohoo — Fri, 16 Jan 2015 10:17:50 GMT

Now it is working, the only problem is the gigabitethernet maximum speed became 10mb/s, when i change it to 100 or 1000 it shuts down the port immediately, so what is your suggestion, please say sth soon

Same thing. CABLE ISSUE.

Did you change the cable?

you know when i connect the

sisbest_ma1 — Fri, 16 Jan 2015 10:58:39 GMT

you know when i connect the ap to a switch the gigabit ethernet goes down immediately, what is the reason please ? can you tell me what exactly i have to do? i can connect to my PC and i can configure but the time i connect to the switch the port goes down, does not blink at the switch port, tell me soon dear.

We can't tell you what we don

Scott Fella — Fri, 16 Jan 2015 12:19:40 GMT

We can't tell you what we don't know. Try a different switch port or a different switch. If your AP works when you connect it to your PC, then I guess the AP Ethernet is working fine, right? When you connect it to your switch it doesn't, so that to me is something on your switch. Your using a regular straight through cable and not a cross over?

-Scott

you know when i connect the

Leo Laohoo — Sat, 17 Jan 2015 06:14:19 GMT

you know when i connect the ap to a switch the gigabit ethernet goes down immediately, what is the reason please ?

*Sigh*

This is going to be my LAST response to this thread. It seems my message is NOT getting through.

If you plug the AP to a FastEthernet port the link comes up but if you plug the AP to a GigabitEthernet port the link goes down. This is a known symptom of a cable fault when the third pair is faulty.

Old thread. Same issue. We

David Sell — Mon, 27 Jul 2015 21:50:04 GMT

Old thread. Same issue. We had a major storm roll through (not common for us here) with periods of high heat and humidity. Four of our 1252APs lost Ethernet functionality. All take PoE from an injector or switch, but the Gig0 port shows up/down. The switch will give it power but it never negotiates a speed. Nothing in the switch logs or console other than power granted messages.

We suspect a power issue killed the four APs. Other APs on the switch and power injectors were not affected.