Errors after upgrading IOS on Cisco2960 Switch

[Rajeev Ranjan]

Hi Folks,

Recently i upgraded IOS image from c2960-lanbase-mz.122-25.SEE2.bin to c2960-lanbasek9-mz.122-55.SE.bin on Cisco 2960G-24TC-L  for enhancing security.But after sucessful upgradation i got CRC, Input Errors, Drops. What can i do? Also tell me how can i use SSH, SNMP v3 if i have to rollback this image.

[Peter Paluch]

Hello Rajeev,

There have been more issues reported regarding the 12.2(55)SE for 2960 series, usually concerned with unusually high CPU loads. It is possible that this IOS version has further issues although it obviously cannot cause input CRC errors. Can you perhaps post the output of the show interfaces output showing the errors on your interface?

There is a newer IOS already available - the 12.2(55)SE1. You may want to try that one, or downgrade to 12.2(53)SE2. All these versions should provide you with both SSH and SNMPv3 if you use the "lanbasek9" feature set.

Best regards,

Peter

[Leo Laohoo]

Hey Peter,

Congrats to your new "star". 

[Peter Paluch]

Hello Leo,

Thank you very much, man! There are so many awesome role models having a "good star color" here on NetPro including you!

Best regards,

Peter

[Leo Laohoo]

There are so many awesome role models having a "good star color" here on NetPro including you!

No need to "butter me up".   

I'm here to learn from a "Networking Academy Instructor".

[Peter Paluch]

Leo,

No buttering - rather an honest and friendly compliment to you and many other friends here on NetPro. I guess we all are continuously learning from each other and I am very thankful for that.

Best regards,

Peter

[Leo Laohoo]

Pleasure's all mine. 

[Rajeev Ranjan]

Hi Peter,

Below is the output of sh Interface:

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 24/255, rxload 17/255
  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 00:00:01, 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: 9251
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 67369000 bits/sec, 9968 packets/sec
  5 minute output rate 95441000 bits/sec, 13883 packets/sec
     268119738 packets input, 219021554523 bytes, 0 no buffer
     Received 48598 broadcasts (27188 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 27188 multicast, 0 pause input
     0 input packets with dribble condition detected
     372101364 packets output, 317025060036 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

I am getting total output drops on uplink port.

[Leo Laohoo]

Rollback to what version?  For SSH to work you need "lanbasek" IOS.

[Rajeev Ranjan]

I want to implement SSH and SNMP v3. For this i upgrade IOS image.and then after  i am getting high output drops.