I have just installed a new C2960-24PC-L switch and i have noticed a few of the ports keep changing their states.
*Mar 2 03:49:13.727: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/17, changed state to down
*Mar 2 03:49:14.733: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to do
*Mar 2 03:49:16.822: %LINK-3-UPDOWN: Interface FastEthernet0/17, changed state to up
*Mar 2 03:49:17.829: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/17, changed state to up
Most of the ports that seem to have the problem have Canon printers and a Canon photocopier connected to them. On this particular port I have changed the cable and set the duplex and speed settings manually. I have also set the Ethernet driver settings on the Canon photocopier to 100 Base-TX (Full Duplex).
interface FastEthernet0/17
switchport mode access
switchport nonegotiate
speed 100
duplex full
spanning-tree portfast
I can also see alot of late collisions on this interface.
FastEthernet0/17 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 04da.d248.1d11 (bia 04da.d248.1d11)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 10/100BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:01, 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 4000 bits/sec, 4 packets/sec
234028 packets input, 237228056 bytes, 0 no buffer
Received 2887 broadcasts (265 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 265 multicast, 0 pause input
0 input packets with dribble condition detected
704084 packets output, 124099205 bytes, 0 underruns
0 output errors, 228 collisions, 1 interface resets
0 babbles, 2101 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
I have also done a TDR test on the interface.
TDR test last run on: March 02 04:08:45
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Fa0/17 100M Pair A 4 +/- 15 meters Pair B Normal
Pair B 4 +/- 15 meters Pair A Normal
Pair C N/A Pair D Not Supported
Pair D N/A Pair C Not Supported
One other port that has a Snom 320 IP phone connected keeps changing it state as well.
*Mar 2 04:04:54.878: %ILPOWER-7-DETECT: Interface Fa0/6: Power Device detected: IEEE PD
*Mar 2 04:04:55.910: %ILPOWER-5-IEEE_DISCONNECT: Interface Fa0/6: PD removed
*Mar 2 04:04:56.942: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to down
*Mar 2 04:04:58.947: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/6, changed state to up
Any other tips on how to fix the problems?
