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37
Helpful
18
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Highlighted
Beginner

High latency issue in LAN - between two switches.

HI

PC -> core SW(6500) -> fiberswitch -> fiberSW - > core SW(4500) -> ------- ping time < 1ms

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time=1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Reply from 10.10.3.7: bytes=32 time<1ms TTL=254

Ping statistics for 10.10.3.7:
    Packets: Sent = 927, Received = 927, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 196ms, Average = 0ms

PC -> core SW(6500) -> fiberswitch -> fiberSW - > core SW(4500) -> Desk Switch (2960) ---- ping time is very inconsistent

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=5ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=17ms TTL=254 -----------------------

Reply from 10.10.3.93: bytes=32 time=5ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=5ms TTL=254

Reply from 10.10.3.93: bytes=32 time=72ms TTL=254 --------------------------

Reply from 10.10.3.93: bytes=32 time=6ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=7ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=11ms TTL=254 -----------------------

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=6ms TTL=254

Ping statistics for 10.10.3.93:
    Packets: Sent = 2076, Received = 2062, Lost = 14 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 3ms, Maximum = 160ms, Average = 7ms

can enyone help me to troubleshoot this issue.. some times it even conectivity get lost..

18 REPLIES 18
Highlighted
Hall of Fame Community Legend

What troubleshooting have YOU done?

1.  Did you check for interface line errors?

2.  When does the high latency occurs?

Highlighted

Well we know that the problem is probably anwhere between here:

core SW(4500) -> Desk Switch (2960)

Since everything before that is less than or equal 1ms which is acceptable LAN performance right?

Can we do a 'show interface' on the 4500 and the 2960 for the interfaces which connect them together please?

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

Please rate useful posts & remember to mark any solved questions as answered. Thank you.
Highlighted

no line errors..

I'm new to this env.. issue was initialy there..

Highlighted

no line errors..

I'm new to this env.. issue was initialy there..

Highlighted
Beginner

Hi Bimal,

could you also provide the output of following commands:

  • show processes cpu history
  • show version

Maybe this is due to a IOS bug which is causing high CPU utilization.

Highlighted

Bimal,

1. Can you check duplix mismatch errors on both switches.

2. check recent logs for any errors.

Thanks

Sri

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WareHouse_1#show processes memory

Processor Pool Total:   34988900 Used:    9477732 Free:   25511168

      I/O Pool Total:    4186112 Used:    1646136 Free:    2539976

Driver te Pool Total:    1048576 Used:         40 Free:    1048536

WareHouse_1#show processes cpu

CPU utilization for five seconds: 6%/0%; one minute: 6%; five minutes: 6%

Highlighted
Beginner

WareHouse_1#show ip interface brief

Interface              IP-Address      OK? Method Status                Protocol

Vlan1                  10.10.3.93      YES NVRAM  up                    up     

FastEthernet0/1        unassigned      YES unset  up                    up     

FastEthernet0/2        unassigned      YES unset  down                  down   

FastEthernet0/3        unassigned      YES unset  up                    up     

FastEthernet0/4        unassigned      YES unset  up                    up     

FastEthernet0/5        unassigned      YES unset  up                    up     

FastEthernet0/6        unassigned      YES unset  up                    up     

FastEthernet0/7        unassigned      YES unset  up                    up     

FastEthernet0/8        unassigned      YES unset  up                    up     

GigabitEthernet0/1     unassigned      YES unset  up                    up     

WTM-WareHouse_1#show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

XWCORE2.X.com

                 Gig 0/1           174           S I      WS-C4507R Gig 3/48

SEP0013C4C63D00  Fas 0/8           133           H P      IP Phone  Port 1

SEP0021A02D56AC  Fas 0/1           132           H P      IP Phone  Port 1

WareHouse_1#          show  version

Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(44)SE6, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2009 by Cisco Systems, Inc.

Compiled Mon 09-Mar-09 18:10 by gereddy

Image text-base: 0x00003000, data-base: 0x01100000

ROM: Bootstrap program is C2960 boot loader

BOOTLDR: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(35r)SE2, RELEASE SOFTWARE (fc1)

WareHouse_1 uptime is 17 weeks, 14 hours, 3 minutes

System returned to ROM by power-on

System image file is "flash:c2960-lanbasek9-mz.122-44.SE6/c2960-lanbasek9-mz.122-44.SE6.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to

export@cisco.com.

cisco WS-C2960-8TC-L (PowerPC405) processor (revision C0) with 61440K/4088K bytes of memory.

Processor board ID XXXXXXXXXXXXX

Last reset from power-on

1 Virtual Ethernet interface

8 FastEthernet interfaces

1 Gigabit Ethernet interface

The password-recovery mechanism is enabled.

64K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address       : XXXXXXXXXXXXXXXX

Motherboard assembly number     : 73-10611-07

Power supply part number        : 341-0208-01

Motherboard serial number       : FOC140359C9

Power supply serial number      : LIT13510LWX

Model revision number           : C0

Motherboard revision number     : D0

Model number                    : WS-C2960-8TC-L

System serial number            : FOC1404V0WF

Top Assembly Part Number        : 800-28132-02

Top Assembly Revision Number    : A0

Version ID                      : V02

CLEI Code Number                : COM8A00ARB

Hardware Board Revision Number  : 0x01

Switch Ports Model              SW Version            SW Image                

------ ----- -----              ----------            ----------              

*    1 9     WS-C2960-8TC-L     12.2(44)SE6           C2960-LANBASEK9-M       

Configuration register is 0xF

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Reply from 10.10.3.93: bytes=32 time=129ms TTL=254

Reply from 10.10.3.93: bytes=32 time=28ms TTL=254

Reply from 10.10.3.93: bytes=32 time=26ms TTL=254

Reply from 10.10.3.93: bytes=32 time=164ms TTL=254

Reply from 10.10.3.93: bytes=32 time=129ms TTL=254

Reply from 10.10.3.93: bytes=32 time=106ms TTL=254

Reply from 10.10.3.93: bytes=32 time=110ms TTL=254

Reply from 10.10.3.93: bytes=32 time=141ms TTL=254

Reply from 10.10.3.93: bytes=32 time=97ms TTL=254

Request timed out.

Reply from 10.10.3.93: bytes=32 time=159ms TTL=254

Reply from 10.10.3.93: bytes=32 time=116ms TTL=254

Reply from 10.10.3.93: bytes=32 time=130ms TTL=254

Request timed out.

Reply from 10.10.3.93: bytes=32 time=8ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=4ms TTL=254

Reply from 10.10.3.93: bytes=32 time=45ms TTL=254

Reply from 10.10.3.93: bytes=32 time=140ms TTL=254

Reply from 10.10.3.93: bytes=32 time=81ms TTL=254

Reply from 10.10.3.93: bytes=32 time=105ms TTL=254

Reply from 10.10.3.93: bytes=32 time=182ms TTL=254

Highlighted

On the 2960 can you please do 'show interface Gig 0/1'

On the 4507R can you also show us 'show int Gig 3/48'

Thank you

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

Please rate useful posts & remember to mark any solved questions as answered. Thank you.
Highlighted

SWCORE2#show interfaces GigabitEthernet 3/48

GigabitEthernet3/48 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet Port, address is 0013.7f64.fd9f (bia 0013.7f64.fd9f)

  Description: ###WareHOUSE##

  MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec,

     reliability 255/255, txload 35/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, link type is auto, media type is 10/100/1000-TX

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

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

  Last input 00:00:09, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 17120466

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 51000 bits/sec, 26 packets/sec

  5 minute output rate 14013000 bits/sec, 1913 packets/sec

     603576762 packets input, 222995427904 bytes, 0 no buffer

     Received 215844037 broadcasts (101082233 multicast)

     0 runts, 0 giants, 0 throttles

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

     0 input packets with dribble condition detected

     7958878068 packets output, 3814037747442 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

WareHouse_1#show interfaces Gig 0/1

GigabitEthernet0/1 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is ec44.76ff.db89 (bia ec44.76ff.db89)

  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

     reliability 255/255, txload 1/255, rxload 20/255

  Encapsulation ARPA, loopback not set

  Keepalive not set

  Full-duplex, 100Mb/s, link type is auto, 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 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 8026000 bits/sec, 1112 packets/sec

  5 minute output rate 40000 bits/sec, 17 packets/sec

     3447611911 packets input, 1613371505792 bytes, 0 no buffer

     Received 931660812 broadcasts (462987703 multicasts)

     0 runts, 0 giants, 0 throttles

     1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 462987703 multicast, 0 pause input

     0 input packets with dribble condition detected

     153756051 packets output, 58314509602 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     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

Highlighted
Hall of Fame Community Legend

Are the ping times from the PC to the management IP Address of the the switches involved?

Can you post the "sh interface " and "sh controller e "?

Highlighted

WareHouse_1#show controllers  ethernet-controller  Gig 0/1      

     Transmit GigabitEthernet0/1              Receive

   2481345501 Bytes                       2925250836 Bytes                   

    145930333 Unicast frames              2516123349 Unicast frames          

      6779361 Multicast frames             462998037 Multicast frames        

      1052141 Broadcast frames             468687974 Broadcast frames        

            0 Too old frames              2466301232 Unicast bytes           

            0 Deferred frames             1623208448 Multicast bytes         

            0 MTU exceeded frames         2381842690 Broadcast bytes         

            0 1 collision frames                   0 Alignment errors        

            0 2 collision frames                   1 FCS errors              

            0 3 collision frames                   0 Oversize frames         

            0 4 collision frames              171465 Undersize frames        

            0 5 collision frames                   0 Collision fragments     

            0 6 collision frames      

            0 7 collision frames            25375590 Minimum size frames     

            0 8 collision frames          1656591706 65 to 127 byte frames   

            0 9 collision frames           513507334 128 to 255 byte frames  

            0 10 collision frames          280950707 256 to 511 byte frames  

            0 11 collision frames          206106014 512 to 1023 byte frames 

            0 12 collision frames          189194709 1024 to 1518 byte frames

            0 13 collision frames                  0 Overrun frames          

            0 14 collision frames                  0 Pause frames            

            0 15 collision frames     

            0 Excessive collisions                 0 Symbol error frames     

            0 Late collisions                      0 Invalid frames, too large

            0 VLAN discard frames          576254766 Valid frames, too large 

            0 Excess defer frames                  0 Invalid frames, too small

      1059255 64 byte frames                       0 Valid frames, too small 

    104685963 127 byte frames         

      6885273 255 byte frames                      0 Too old frames          

      7803365 511 byte frames                      0 Valid oversize frames   

      2278629 1023 byte frames                     0 System FCS error frames 

     21695573 1518 byte frames                     0 RxPortFifoFull drop frame

      9353777 Too large frames        

            0 Good (1 coll) frames    

            0 Good (>1 coll) frames   

Highlighted
Hall of Fame Community Legend

Undersized frames?????  That's not good.

Can you elaborate what is connected to this port?

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