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762
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C9500-48YAC input/CRC errors varying tx/rx levels

the-lebowski
Level 4
Level 4

‎03-12-2023 06:32 PM - edited ‎03-12-2023 06:48 PM

I have a stack of 9500s with a link down to a 3750 via fiber.  Started seeing some issues with video choppiness from equipment connected to the 3750.  Looking at the link side on the 9500 I see a fair amount of input/CRC errors and after changing both the SFP and fiber patch to the patch panel it made no difference.  I see low power level alarms in the logs on the 9500 side as well but nothing on the 3750 side which is clean.

Is it safe to say something in the path is bad?  

 

TwentyFiveGigE1/0/45 is up, line protocol is up (connected)
Hardware is Twenty Five Gigabit Ethernet, address is e41f.7bb6.58ad (bia e41f.7bb6.58ad)
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 set (10 sec)
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX SFP
input flow-control is on, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:16, output 00:00:00, output hang never
Last clearing of "show interface" counters 06:50:02
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 9000 bits/sec, 10 packets/sec
5 minute output rate 22000 bits/sec, 12 packets/sec
318147 packets input, 42252690 bytes, 0 no buffer
Received 2803 broadcasts (2337 multicasts)
3 runts, 0 giants, 0 throttles
6520 input errors, 204 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 2337 multicast, 0 pause input
0 input packets with dribble condition detected
382094 packets output, 74731489 bytes, 0 underruns
Output 8767 broadcasts (0 multicasts)
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

 

thelebowski_0-1678671930276.png

3750 side:

 

GigabitEthernet1/1/2 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is b0fa.eb1b.0cb2 (bia b0fa.eb1b.0cb2)
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 00:00:03, 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 10000 bits/sec, 11 packets/sec
5 minute output rate 11000 bits/sec, 11 packets/sec
379496 packets input, 73812839 bytes, 0 no buffer
Received 61448 broadcasts (52717 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 52717 multicast, 0 pause input
0 input packets with dribble condition detected
322929 packets output, 42019057 bytes, 0 underruns
0 output errors, 0 collisions, 1 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

 

thelebowski_0-1678671743702.png

 

 

 

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0 Helpful
10 Replies 10

Leo Laohoo
Hall of Fame
Hall of Fame

‎03-12-2023 07:13 PM

@the-lebowski wrote:
Last clearing of "show interface" counters 06:50:02​

On the 9500, post the complete output to the command "sh controll e Twe 1/0/45".

0 Helpful

the-lebowski
Level 4
Level 4
In response to Leo Laohoo

‎03-13-2023 06:44 AM - edited ‎03-13-2023 07:30 AM

Yeah I cleared those counters before I swapped the patch and SFP to see if they would increment after the fact.

 

 

r19500#show controllers e twentyFiveGigE 1/0/45

Transmit                  TwentyFiveGigE1/0/45          Receive
 238894429040 Total bytes                100570422562 Total bytes
    277548510 Unicast frames                222952279 Unicast frames
 192666023726 Unicast bytes               83620926190 Unicast bytes
    278345056 Multicast frames              147484794 Multicast frames
  38561918928 Multicast bytes             16861086081 Multicast bytes
     72164024 Broadcast frames                1224060 Broadcast frames
   7666486386 Broadcast bytes                       1 Broadcast bytes
            0 System FCS error frames               0 IpgViolation frames
            0 MacUnderrun frames                    0 MacOverrun frames
            0 Pause frames                          0 Pause frames
            0 Cos 0 Pause frames                    0 Cos 0 Pause frames
            0 Cos 1 Pause frames                    0 Cos 1 Pause frames
            0 Cos 2 Pause frames                    0 Cos 2 Pause frames
            0 Cos 3 Pause frames                    0 Cos 3 Pause frames
            0 Cos 4 Pause frames                    0 Cos 4 Pause frames
            0 Cos 5 Pause frames                    0 Cos 5 Pause frames
            0 Cos 6 Pause frames                    0 Cos 6 Pause frames
            0 Cos 7 Pause frames                    0 Cos 7 Pause frames
            0 Oam frames                            0 OamProcessed frames
            0 Oam frames                            0 OamDropped frames
     13239250 Minimum size frames             1141616 Minimum size frames
    390376184 65 to 127 byte frames         277915291 65 to 127 byte frames
     42934917 128 to 255 byte frames         15487482 128 to 255 byte frames
     45414473 256 to 511 byte frames         23729493 256 to 511 byte frames
     18024789 512 to 1023 byte frames        19676603 512 to 1023 byte frames
     55870868 1024 to 1518 byte frames       40384728 1024 to 1518 byte frames
     62197109 1519 to 2047 byte frames        3197386 1519 to 2047 byte frames
            0 2048 to 4095 byte frames              9 2048 to 4095 byte frames
            0 4096 to 8191 byte frames              0 4096 to 8191 byte frames
            0 8192 to 16383 byte frames             0 8192 to 16383 byte frames
            0 16384 to 32767 byte frame             0 16384 to 32767 byte frame
            0 > 32768 byte frames                   0 > 32768 byte frames
            0 Late collision frames           9728516 SymbolErr frames
        35729 Excess Defer frames                4264 Collision fragments
            0 Good (1 coll) frames               3428 ValidUnderSize frames
            0 Good (>1 coll) frames                 0 InvalidOverSize frames
            0 Deferred frames                       0 ValidOverSize frames
            0 Gold frames dropped              156984 FcsErr frames
            0 Gold frames truncated
            0 Gold frames successful
            0 1 collision frames
            0 2 collision frames
            0 3 collision frames
            0 4 collision frames
            0 5 collision frames
            0 6 collision frames
            0 7 collision frames
            0 8 collision frames
            0 9 collision frames
            0 10 collision frames
            0 11 collision frames
            0 12 collision frames
            0 13 collision frames
            0 14 collision frames
            0 15 collision frames
            0 Excess collision frames

LAST UPDATE 589 msecs AGO

 

0 Helpful

MHM Cisco World
VIP
VIP
In response to the-lebowski

‎03-13-2023 07:25 AM

hardcoded the MTU size in both side.

0 Helpful

the-lebowski
Level 4
Level 4
In response to MHM Cisco World

‎03-13-2023 07:26 AM

Are you saying to hardcode the MTU on both sides?

MHM Cisco World
VIP
VIP
In response to the-lebowski

‎03-13-2023 05:43 PM

Yes 

0 Helpful

the-lebowski
Level 4
Level 4
In response to MHM Cisco World

‎03-13-2023 05:47 PM

I can't on the 3750 side, at least not on the interface itself.  The only thing I can do is set the system and routing  MTU but I don't have the option to set the MTU on the physical interface being used for the uplink.  

3750hq#conf t
Enter configuration commands, one per line. End with CNTL/Z.
3750hq(config)#int gi1/1/2
3750hq(config-if)#mtu?
% Unrecognized command

 

interface GigabitEthernet1/1/2
 description Uplink to U-9500
 switchport trunk allowed vlan xx,xxxx
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to the-lebowski

‎03-13-2023 02:47 PM

@the-lebowski wrote:
9728516 SymbolErr frames
   4264 Collision fragments
   3428 ValidUnderSize frames
 156984 FcsErr frames

Describe the physical link.  Is this a single patch cable or is there a horizontal cabling plant involved?

0 Helpful

the-lebowski
Level 4
Level 4
In response to Leo Laohoo

‎03-13-2023 05:12 PM

9500 SFP > fiber patch cable > fiber patch panel > fiber run down to 1st floor > patch panel > fiber patch cable > SFP 3750.
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to the-lebowski

‎03-13-2023 09:44 PM

Use a different pair of fibre.  The line errors are significant and points to a Layer 1 issue.  If using a different pair of fibre plant to the first floor works, then get the original pair investigated for a potential break in the glass.

the-lebowski
Level 4
Level 4
In response to Leo Laohoo

‎03-14-2023 07:01 AM

I figured as much.  Thanks for your help.

0 Helpful
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