ICMP Problem

[pottabathininaveen]

Dear All,

              I'm facing problem with latency to point to point IP  configured on cisco L3 switch. switch details as follows.

Model: WS-C3750X-24

Flash:c3750e-universalk9-mz.152-2.E.bin

UPCOUNTRY-L3#sh int g 1/0/10
GigabitEthernet1/0/10 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 4c00.829b.43ff (bia 4c00.829b.43ff)
  Description: ICMP-TEST
  Internet address is 192.168.1.1/30
  MTU 9000 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 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:00:01
  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 678000 bits/sec, 80 packets/sec
  5 minute output rate 822000 bits/sec, 104 packets/sec
     17 packets input, 1231 bytes, 0 no buffer
     Received 0 broadcasts (0 IP multicasts)
     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
     17 packets output, 9846 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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

interface GigabitEthernet1/0/10
 description ICMP-TEST
 no switchport
 ip address 192.168.1.1 255.255.255.252
end

And checked with changing patch cable from switch to pc and checked changing the pc also result were same. Kindly suggest what to do.

[Luke Huang]

Do you mean connect a PC to 3750X g 1/0/10, PC ip address 192.168.1.2 255.255.255.252, then PC ping 192.168.1.1 with high delay?

If yes, then it should be a normal behavior.

[pottabathininaveen]

Hello,

     Yes it was same, but it should not be like that. Kindly suggest some command to rectify it. 

[saif musa]

Whats the status of pinging other devices on the same switch ?? regardless network prefix is /30

[pottabathininaveen]

Yes we are facing problem in the all the ports regardless network prefix.

[saif musa]

Pottabathininaveen,

Basically, Ping response is low on the priority list of things the switches do .  Do not use this as more than a rudimentary test. also, there's a few things you can do to start off to try and find out what is causing latency..

--Show process cpu history command: if the CPU usage is very high, then you need to see which process is causing this and perhaps hit google with the offending process.

--show debug command: a common cause I've found is people leaving debug commands running on the switch. A common favourite was IP accounting being left on devices that were already over-utilized. Use "undebug all" to get rid of the debugs.

--Give it a reboot: probably not possibly during the day, but use the "reload in" command to time it at night or over the weekend. You'd be surprised how many issues a quick reboot can fix.

--shut trunk ports - as long as its L3 switch, another common issue I've seen is too much traffic using this device for routing between VLANs. If possible, temporarily shut some of the trunk ports to see if this reduces the latency.

 

Hope that helps

 

Regards

 

 

 

 

[pottabathininaveen]

Hi, I will try it today and let you know the status 

[Glenn Martin]

pottabathininaveen

I've moved this discussion to the LAN,Switching community for better visibility..