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Very Slow Network Response

Hi All,

For the last month I have an issue in my Application Server which is directly connected to Core Switch through optical fiber cable, the application server response is very slow, I have verified the port statistics (also attached) but not able to find why the process is so slow. Can anyone help me on this or suggest something else that how to approach the issue.

I have no other optical port available for a momnet in a switch, where i can verify that by changing port it is working fine.

Best Regards

Abid rana

Core-Switch#sh int g2/6

GigabitEthernet2/6 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is 000a.bxxx.exxx (bia 000a.bxxx.exxx)

  Description: Production Application Server GE0

  MTU 1500 bytes, BW 1000000 Kbit, 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, link type is auto, media type is 1000BaseSX

  input flow-control is on, output flow-control is off

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output never, output hang never

  Last clearing of "show interface" counters 00:42:19

  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 2000 bits/sec, 2 packets/sec

  5 minute output rate 3000 bits/sec, 3 packets/sec

     30331 packets input, 8541250 bytes, 0 no buffer

     Received 146 broadcasts (133 multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 input packets with dribble condition detected

     49690 packets output, 30155225 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 babbles, 0 late collision, 0 deferred

     0 lost carrier, 0 no carrier

     0 output buffer failures, 0 output buffers swapped out


Very Slow Network Response

Hi Abid,

As per the interface statistics pasted, there does not seem to be any issue, atleast for past 42 minutes, and the traffic is also very minimal for 5 min. avg.

So what I can suggest is to try and narrow this down using Per-hop technique. Now you mentioned that you see slow server response, in other words high latency. correct me if I am wrong

I am going to assume a basic topology for providing a suggestion:

Server (vlan1)--- Core Switch --- End user (vlan2)

Lets say that you are seeing high latency from the End user present in vlan2, check from the switch itself, if the response time is still high or not.

If from switch, latency is fine, then ping from End user to Switch and see if that has high latency or not

You can even check from another user in Vlan1 and ping towards the server and see if the respnse is fine or not.

Check if CEF is working on the core or not, because it should.

the above steps will help you in narrowing the issue either to the L3 process of Core or Port/cable/hardware fault

Hope the above steps helps in some way


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