Interface Flapping in 2960 Switch

[Robo123]

Hi Team,

I have three WS-C2960X-48TS-L Switches in stack where observing all access port which is connected to end system are getting freequent flapp.

IOS running:-“ c2960x-universalk9-mz.152-2.E6.bin"

+ No layer 1 issue.cabling everything proper.

+Initially keep alive was disabled so we have enabled the same.

Below is the current int face conf

interface GigabitEthernet1/0/1

 switchport access vlan 38

 switchport mode access

 switchport voice vlan 3

 no snmp trap link-status

 storm-control broadcast level 5.00

 storm-control multicast level 5.00

 spanning-tree portfast

 spanning-tree bpduguard enable

 Below are the errormessage found in the logging buffer.

Mar 29 09:17:37.774: [IDB Gi1/0/41 UDRUYY] LSTATE_REQ: Entry

Mar 29 09:17:37.774: [IDB Gi1/0/41 UDRUYY] LSTATE_REQ: timers not running

Mar 29 09:17:37.774: [IDB Gi1/0/41 UDRUYY] LSTATE_REQ: starting lineproto timer

Mar 29 09:17:37.774: [IDB Gi1/0/41 UDRUYY] LSTATE_REQ: delay 1000

Mar 29 09:17:37.774: [IDB Gi1/0/41 UDRUYY] LSTATE_REQ: Exit

Mar 29 09:17:38.774: [IDB Gi1/0/41 DURUYY] LSTATE_TMR: Entry

Mar 29 09:17:38.774: [IDB Gi1/0/41 DURUYY] LSTATE_TMR: not spoofing, current state:

Can any one suggest how we can resolve the issue?

[Leo Laohoo]

Post the complete output to the command "sh interface G1/0/1 controll".

[Robo123]

Hi Leo,

Please find the below .

Transmit GigabitEthernet1/0/1 Receive
2342490151 Bytes 1298236435 Bytes
589767989 Unicast frames 378152945 Unicast frames
358905348 Multicast frames 2719340 Multicast frames
38294254 Broadcast frames 395730 Broadcast frames
0 Too old frames 447843765 Unicast bytes
0 Deferred frames 735301820 Multicast bytes
0 MTU exceeded frames 40184361 Broadcast bytes
0 1 collision frames 0 Alignment errors
0 2 collision frames 215357 FCS errors
0 3 collision frames 34 Oversize frames
0 4 collision frames 0 Undersize frames
0 5 collision frames 1603990 Collision fragments
0 6 collision frames
0 7 collision frames 281534436 Minimum size frames
0 8 collision frames 36197349 65 to 127 byte frames
0 9 collision frames 24147473 128 to 255 byte frames
0 10 collision frames 10227365 256 to 511 byte frames
0 11 collision frames 17099288 512 to 1023 byte frames
0 12 collision frames 12277734 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 273 Symbol error frames
0 Late collisions 34 Invalid frames, too large
0 VLAN discard frames 0 Valid frames, too large
0 Excess defer frames 1603990 Invalid frames, too small
132603961 64 byte frames 0 Valid frames, too small
466762514 127 byte frames
77779468 255 byte frames 0 Too old frames
12762192 511 byte frames 0 Valid oversize frames
84657319 1023 byte frames 0 System FCS error frames
212402135 1518 byte frames 0 RxPortFifoFull drop frame
2 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames

[Leo Laohoo]

---

@Robo123 wrote:

215357 FCS errors
1603990 Collision fragments

---

The output is only half complete?  Where's the other half?

OK, so half of the output points to a cabling issue.  Kindly perform the following commands: 

1.  Command:  test cable tdr int g 1/0/1; 

2.  Wait for approximately 5 to 7 seconds for the command to run; 

3.  Command:  sh cable tdr int G1/0/1; and

4.  Post the complete output to #3.