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mt1576980
Beginner

link failure between 2960

Hi, im Victor and im having two problems in a switch, from one side  i have a switch A te2/0/2 connected to a Switch B te2/0/2, the switch sometimes blink orange Green, and sometimes is blinking Green only. If the port ar runing a few hours, it suddenly stops to work and inthe side B the port goes to err-disabled.

Both switch are cisco 2960x and are running  15.2(2)E3, the fiberoptic are about 500 ft of lenght, with Belden Patchcord FT4 of 9.8ft with gbix SFP-10G-SR.

Switch A

TenGigabitEthernet2/0/2 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet, address is 188b.459f.5eb4 (bia 188b.459f.
  Description: Redundant Link to SSRAMSWAL003 Te2/0/2
  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
     reliability 253/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-SR
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:36, output 00:00:36, output hang never
  Last clearing of "show interface" counters 00:00:48
  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 764000 bits/sec, 206 packets/sec
  5 minute output rate 771000 bits/sec, 150 packets/sec
     2033 packets input, 463456 bytes, 0 no buffer
     Received 2033 broadcasts (2013 multicasts)
     0 runts, 0 giants, 0 throttles
     16 input errors, 16 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 2013 multicast, 0 pause input
     0 input packets with dribble condition detected
     12 packets output, 2394 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

Transmit TenGigabitEthernet2/0/2         Receive
    186323203 Bytes                        764462964 Bytes                  
       315288 Unicast frames                  354224 Unicast frames         
       159743 Multicast frames               5335490 Multicast frames       
         9315 Broadcast frames                119874 Broadcast frames       
            0 Too old frames               164649252 Unicast bytes          
            0 Deferred frames              514993140 Multicast bytes        
            0 MTU exceeded frames            9131237 Broadcast bytes        
            0 1 collision frames                   0 Alignment errors       
            0 2 collision frames              159916 FCS errors             
            0 3 collision frames                  49 Oversize frames        
            0 4 collision frames                   0 Undersize frames       
            0 5 collision frames               13608 Collision fragments    
            0 6 collision frames
            0 7 collision frames              273999 Minimum size frames    
            0 8 collision frames             4631703 65 to 127 byte frames  
            0 9 collision frames              647898 128 to 255 byte frames 
            0 10 collision frames             325866 256 to 511 byte frames 
            0 11 collision frames              23344 512 to 1023 byte frames
            0 12 collision frames              53486 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             15756 Symbol error frames    
            0 Late collisions                   9074 Invalid frames, too large
            0 VLAN discard frames              33547 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
        11050 64 byte frames                       0 Valid frames, too small
       169464 127 byte frames
       145060 255 byte frames                      0 Too old frames         
        69376 511 byte frames                      0 Valid oversize frames  
        16653 1023 byte frames                     0 System FCS error frames
        34651 1518 byte frames                     0 RxPortFifoFull drop frame
        38092 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

Switch B

TenGigabitEthernet2/0/2 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet, address is 188b.459f.3434 (bia 188b.459f.3434)
  Description: Redundant Link to SSRAMSWAL002 Te2/0/2
  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-SR
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:25, output 00:00:24, output hang never
  Last clearing of "show interface" counters 00:01:09
  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 656000 bits/sec, 120 packets/sec
  5 minute output rate 651000 bits/sec, 176 packets/sec
     26 packets input, 4002 bytes, 0 no buffer
     Received 26 broadcasts (26 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 26 multicast, 0 pause input
     0 input packets with dribble condition detected
     2077 packets output, 386346 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

Transmit TenGigabitEthernet2/0/2         Receive
    764882246 Bytes                        186223887 Bytes                  
       388824 Unicast frames                  315211 Unicast frames         
      5494161 Multicast frames                159439 Multicast frames       
       122655 Broadcast frames                  9314 Broadcast frames       
            0 Too old frames               158446772 Unicast bytes          
            0 Deferred frames               25573574 Multicast bytes        
            0 MTU exceeded frames             744441 Broadcast bytes        
            0 1 collision frames                   0 Alignment errors       
            0 2 collision frames                   0 FCS errors             
            0 3 collision frames                   0 Oversize frames        
            0 4 collision frames                   0 Undersize frames       
            0 5 collision frames                   0 Collision fragments    
            0 6 collision frames
            0 7 collision frames               11008 Minimum size frames    
            0 8 collision frames              169365 65 to 127 byte frames  
            0 9 collision frames              144890 128 to 255 byte frames 
            0 10 collision frames              69353 256 to 511 byte frames 
            0 11 collision frames              16628 512 to 1023 byte frames
            0 12 collision frames              34629 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              38091 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
       275432 64 byte frames                       0 Valid frames, too small
      4637854 127 byte frames
       646526 255 byte frames                      0 Too old frames         
       326145 511 byte frames                      0 Valid oversize frames  
        23272 1023 byte frames                     0 System FCS error frames
        53675 1518 byte frames                     0 RxPortFifoFull drop frame
        42736 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

Can you help me to check if someting is wrong? or if i need to configure anything else on the interface? both are wi this configuration:

interface TenGigabitEthernet2/0/2
 description Redundant Link to SSRAMSWAL003 Te2/0/2
 switchport mode trunk

By other side, i have the switch A connected to my core switch and the same situation, are not working OK, the weird thing is that was working ok and that the B switch has the same configuration and versions and are connected to the same switch and are working OK.

This is the info for this interface gi1/0/49 from A switch, note, i just reset it about a 20 minutes ago.....

GigabitEthernet1/0/49 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 188b.459f.4431 (bia 188b.459f.4431)
  Description: Uplink to SSRAMSWDL001 Gi1/1/2
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:02, output hang never
  Last clearing of "show interface" counters 00:28:02
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1737
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1836000 bits/sec, 429 packets/sec
  5 minute output rate 2543000 bits/sec, 468 packets/sec
     934193 packets input, 571468598 bytes, 0 no buffer
     Received 48381 broadcasts (39979 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 39979 multicast, 0 pause input
     0 input packets with dribble condition detected
     934948 packets output, 574308328 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

sh controllers ethernet-controller gi1/0/49

     Transmit GigabitEthernet1/0/49           Receive
   3009633492 Bytes                       1047667804 Bytes                  
   1918782770 Unicast frames              1833288838 Unicast frames         
     10382137 Multicast frames             306482603 Multicast frames       
      2027031 Broadcast frames             141170395 Broadcast frames       
            0 Too old frames              1177069505 Unicast bytes          
            0 Deferred frames             3411007577 Multicast bytes        
            0 MTU exceeded frames         1950148513 Broadcast bytes        
            0 1 collision frames                   0 Alignment errors       
            0 2 collision frames                1197 FCS errors             
            0 3 collision frames                   0 Oversize frames        
            0 4 collision frames                   0 Undersize frames       
            0 5 collision frames                 399 Collision fragments    
            0 6 collision frames
            0 7 collision frames            72053411 Minimum size frames    
            0 8 collision frames           824615649 65 to 127 byte frames  
            0 9 collision frames           419220019 128 to 255 byte frames 
            0 10 collision frames          285244496 256 to 511 byte frames 
            0 11 collision frames           42967605 512 to 1023 byte frames
            0 12 collision frames          437914162 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           1185643 Symbol error frames    
            0 Late collisions                 182679 Invalid frames, too large
            0 VLAN discard frames          199930494 Valid frames, too large
            0 Excess defer frames                560 Invalid frames, too small
      1107759 64 byte frames                       0 Valid frames, too small
    454740674 127 byte frames
    431180245 255 byte frames                      0 Too old frames         
    267725729 511 byte frames                      0 Valid oversize frames  
     51891002 1023 byte frames                     0 System FCS error frames
    132042261 1518 byte frames                     0 RxPortFifoFull drop frame
    592504268 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

can you help me please? thanks!!

1 ACCEPTED SOLUTION

Accepted Solutions
Leo Laohoo
VIP Community Legend

159916 FCS errors

Be very careful about clearing interface counters because it wipes away critical evidences.   I am very happy to see that not everyone knows how to clear the counters for the "sh controller e" command because it shows me it's a Layer 1 issue. 

reliability 253/255, txload 1/255, rxload 1/255

This snapshot tells me that there is a potential Layer 1 issue with Ten 2/0/2.  

View solution in original post

2 REPLIES 2
Leo Laohoo
VIP Community Legend

159916 FCS errors

Be very careful about clearing interface counters because it wipes away critical evidences.   I am very happy to see that not everyone knows how to clear the counters for the "sh controller e" command because it shows me it's a Layer 1 issue. 

reliability 253/255, txload 1/255, rxload 1/255

This snapshot tells me that there is a potential Layer 1 issue with Ten 2/0/2.  

View solution in original post

Hi Leo Laohoo, it seems that everything its ok after i changed the fiber to other pair about an hour ago.... thanks for your help! ill keep this thread updated, best regards!