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2960 switch port fluctuations when IP cameras are connected


Hi friends,


 We have a situation.

 We have a 2960 Cisco switch on which we have 10 PTZ cameras (drawing 30 W) and 25 normal cameras connected (drawing 15.4 w).

 Now, when the cameras are tuned for higher clarity, the switch ports goes down. As per the camera datasheet , the maximum power drawn is 22W.

 Have anyone faced such an issue.?

 Can it be something related to collision due to high data flow or something?

 Appreciate any troubleshooting guidance. Thank you.



Hall of Fame Community Legend

What exact model is your 2960 switch?  

Can you also post the output to the command "sh interface <BLAH>" to one of the ports which would go down?



Hi Leo,

Thank you for the reply and sorry for the delay.

The switch model is Cisco Catalyst 2960S-48FPD-L.

Below is the sh interface output for the interface which went down.


GigabitEthernet1/0/41 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 5017.ff22.9ea9 (bia 5017.ff22.9ea9)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, 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 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1981
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 6743000 bits/sec, 905 packets/sec
     2409235054 packets input, 3562635785604 bytes, 0 no buffer
     Received 366038 broadcasts (355394 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 355394 multicast, 0 pause input
     0 input packets with dribble condition detected
     4638976920 packets output, 5756168176334 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 unknown protocol drops
     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



 I couldn't find any problem in the switch.

 please let me know if more outputs are required.





Hall of Fame Community Legend

Ok, I need more outputs:  


  1. sh controller e Gi1/0/41; and
  2. sh power inline Gi1/0/41


Next, I need you to do the following:  


1.  Command:  test cable tdr interface Gi1/0/41; 

2.  Wait for approximately 5 to 7 seconds; 

3.  Command:  sh cable tdr interface Gi1/0/41; and

4.  Post the out put to #3.  


NOTE:  When you are running a TDR on a PoE port, the end-device will loose power.  This is to be expected.  





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