Port counters show no packets yet when tested link shows ?

[Scotland1314]

When I tested a switch through the web interface of CDM certain ports showed no activity or packet transfer (no clear counters either) yet when I put a Fluke tester on one port that had no activity a link light came up and a ping was successful any ideas why that would be ?.

Also (stupid question) can you stack two 3750G's with just a cat6 cable ?.

Thanks in advance.

[glen.grant]

I guess the question is after you put the device on the port and pinged it did the counters increment . Not quite sure of your comment .  The answer to your second question is just tieing 2 3750's together with a patch cable is not stacking and they are not treated as a single switch .In order to do that you must use the stacking cables to tie them together in the back of the switch .  Just tieing them together like you suggest is just daisy chaining them together and they are 2 separate switches...

[Scotland1314]

Thanks for that Glen. Strange thing is I traced the port back to the socket in question and a pc was plugged in and working on it, this is only happening on certain ports see the stats -

Confused ?, I am.

4TH_ENG_EXP_A#show int
4TH_ENG_EXP_A#show interfaces gig
4TH_ENG_EXP_A#show interfaces gigabitEthernet 1/0/7
GigabitEthernet1/0/7 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet, address is 001a.2fd7.2387 (bia 001a.2fd7.2387)
  Description: 431D
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Auto-duplex, Auto-speed, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (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
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
--More--

[cadet alain]

Hi,

How can a ping through this interface be successful?

GigabitEthernet1/0/7 is down, line protocol is down (notconnect)

The interface is not sensing anything so a ping through it can't be successful.

[Scotland1314]

My point exactly, yet their is a working PC at the other end !!.

The only thing I can think of is an incorrectly labeled

network socket.

[Jon Marshall]

Alex

Get the PC's mac-address and then have a look at the mac-address table on the switch and see what port the mac-address is tied to.

Jon

[rtjensen4]

Hi Alex,

I had the same problem with some brand new 3750Xs. There was no link light on the port, yet it was passing traffic just fine. TAC attributed it to a bug in the IOS, but at the time there wasn't a newer version of code out yet. I'm running: c3750e-universalk9-mz.122-53.SE2.bin.