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Input errors on Gig 0/0 (Multi-Vlan)

Answered Question
Nov 21st, 2013
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Hi,

     i am getting input errors on Router 3845 Gig 0/0 which is holding 4 Vlans, error are increasing after every 1 minutes. Router gig 0/0 was connected to Switch 3560G Gig 0/24. i changed the port to gig 0/23, changed the LAN cable (cable directly connected to router and switch not patch panel). changed the Duplex to Full on both end. changed the speed to 1000 on both end. but same issue. Duplex and speed was auto/auto on both end but i was still gettig input errors on router gig 0/0. then i changed duplex and speed as mentioned above. there is no errors on switch gig 0/23 and 0/24. the error are olny on router gig 0/0. please help me in this regards. my previous router had same issue therefore i change it with new router.

Correct Answer by Leo Laohoo about 3 years 9 months ago
reliability 255/255, txload 3/255, rxload 3/255

When you enter the command "sh interface G0/0" on your router, have you ever seen the other values, above highlighted in RED, other than "255"?

Correct Answer by Leo Laohoo about 3 years 9 months ago

Post the following output:


1.  Router:  sh interface Gi0/0;

2.  3560G:  sh interface ; and

3.  3560G:  sh controller e

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Correct Answer
Leo Laohoo Thu, 11/21/2013 - 13:47
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Post the following output:


1.  Router:  sh interface Gi0/0;

2.  3560G:  sh interface ; and

3.  3560G:  sh controller e

qasimkhans Thu, 11/21/2013 - 17:04
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here is Router


ITC-R3845#sh inter gig 0/0

GigabitEthernet0/0 is up, line protocol is up

  Hardware is BCM1125 Internal MAC, address is 0021.5537.7090 (bia 0021.5537.7090)

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 3/255, rxload 3/255

  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set

  Keepalive set (10 sec)

  Full Duplex, 1Gbps, media type is RJ45

  output flow-control is XON, input flow-control is XON

  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 2d02h

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 309

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 13223000 bits/sec, 2482 packets/sec

  5 minute output rate 12434000 bits/sec, 2504 packets/sec

     697378916 packets input, 2574884048 bytes, 0 no buffer

     Received 2908397 broadcasts (0 IP multicasts)

     0 runts, 0 giants, 0 throttles

     4198 input errors, 0 CRC, 0 frame, 4107 overrun, 0 ignored

     0 watchdog, 806066 multicast, 0 pause input

     695752579 packets output, 3222896986 bytes, 0 underruns

     0 output errors, 0 collisions, 1 interface resets

     11 unknown protocol drops

     0 babbles, 0 late collision, 0 deferred

     1 lost carrier, 0 no carrier, 0 pause output

     0 output buffer failures, 0 output buffers swapped out



here is Switch

ITC-Core-SW3560G-PoE#sh inter gig 0/23

GigabitEthernet0/23 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is 001e.7964.4997 (bia 001e.7964.4997)

  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

     reliability 255/255, txload 2/255, rxload 2/255

  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 00:00:16, 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 8917000 bits/sec, 1124 packets/sec

  5 minute output rate 8931000 bits/sec, 1419 packets/sec

     679051148 packets input, 471366142835 bytes, 0 no buffer

     Received 29559141 broadcasts (0 multicasts)

     271 runts, 0 giants, 0 throttles

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

     0 watchdog, 29256963 multicast, 7275 pause input

     0 input packets with dribble condition detected

     919815108 packets output, 508855736468 bytes, 0 underruns

     0 output errors, 0 collisions, 5 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



ITC-Core-SW3560G-PoE#sh controllers ethernet-controller gigabitEthernet 0/23


     Transmit GigabitEthernet0/23             Receive

   2222457323 Bytes                       3387753980 Bytes

    914270731 Unicast frames               649657763 Unicast frames

      1248503 Multicast frames              29276769 Multicast frames

      4527692 Broadcast frames                302306 Broadcast frames

            0 Too old frames              3542007398 Unicast bytes

            0 Deferred frames             3350433303 Multicast bytes

            0 MTU exceeded frames           19444768 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           238015639 Undersize frames

            0 5 collision frames                   0 Collision fragments

            0 6 collision frames

            0 7 collision frames              516129 Minimum size frames

            0 8 collision frames            97181678 65 to 127 byte frames

            0 9 collision frames           283317718 128 to 255 byte frames

            0 10 collision frames           23012528 256 to 511 byte frames

            0 11 collision frames           53790486 512 to 1023 byte frames

            0 12 collision frames          221425574 1024 to 1518 byte frames

            0 13 collision frames                  0 Overrun frames

            0 14 collision frames               7275 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                  0 Valid frames, too large

            0 Excess defer frames                  0 Invalid frames, too small

    237309472 64 byte frames               238015639 Valid frames, too small

     79130137 127 byte frames

    277555027 255 byte frames                      0 Too old frames

     22850034 511 byte frames                      0 Valid oversize frames

     55582617 1023 byte frames                     0 System FCS error frames

    247619639 1518 byte frames                     0 RxPortFifoFull drop frame

            0 Too large frames

            0 Good (1 coll) frames

            0 Good (>1 coll) frames


i am sorry i mistakenly clicked on correct answer button.

Leo Laohoo Thu, 11/21/2013 - 17:11
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Full-duplex, 1000Mb/s

did you have speed and duplex set?  Set it back to auto.

7275 Pause frames

Router is sending Pause frames to the switch telling the switch to STOP or slow down.

qasimkhans Thu, 11/21/2013 - 17:22
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it was on auto/auto but i was still getting errors. if duplex is auto there is messages on router. duplex mismatch that is why i put duplrex full.

Leo Laohoo Thu, 11/21/2013 - 17:42
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On the 3560G, try this:


1.  Command:  test cable tdr interface G0/23;

2.  Wait for 61 seconds;

3.  Command:  sh cable tdr interface G0/23; and

4.  Post the output to #3.


WARNING:  If your 3560G is running an old IOS, 12.2(44)SE and earliear, this command is disruptive.

qasimkhans Thu, 11/21/2013 - 17:50
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Here is output


ITC-Core-SW3560G-PoE#sh cable tdr interface gig 0/23

TDR test last run on: November 21 20:46:15



Interface Speed Local pair Pair length        Remote pair Pair status

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

Gi0/23    1000M Pair A     0    +/- 4  meters Pair A      Normal

                Pair B     0    +/- 4  meters Pair B      Normal

                Pair C     0    +/- 4  meters Pair C      Normal

                Pair D     1    +/- 4  meters Pair D      Normal

Correct Answer
Leo Laohoo Thu, 11/21/2013 - 17:57
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reliability 255/255, txload 3/255, rxload 3/255

When you enter the command "sh interface G0/0" on your router, have you ever seen the other values, above highlighted in RED, other than "255"?

Leo Laohoo Thu, 11/21/2013 - 18:38
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i checked it but i did not find other than 255.

Keep an eye on it.  If it ever go below 255, change the cable immediately.

qasimkhans Thu, 11/21/2013 - 18:40
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ok i will. but what you think about this issue. all the setting you saw. what is you the expert opinion on this issue.

Leo Laohoo Fri, 11/22/2013 - 16:35
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My opinion is you could have a potential cable issue.  Can't be certain.  TDR is showing fine ... but then again TDR has to be precise and can sometimes require "perfect timing" to see the cable pairs drop. 

qasimkhans Fri, 11/22/2013 - 16:54
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ok i will change cable again. but i noticed that when traffic goes above 20mb on interface gig 0/0 then i receive input errors on interface gig 0/0. if traffic continue above 20mb then i contiue receive errors.otherwise there is no single error if traffic below 20 mb.

Leo Laohoo Fri, 11/22/2013 - 17:03
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when traffic goes above 20mb on interface gig 0/0 then i receive input errors on interface gig 0/0.

Make sense.  The router can't process the amount of traffic coming from the switch so the router sends the unprocessed data into a buffer until the buffer gets full.  When this happens the router stop dropping packets. 


You may want to consider slowing down the amount of data going from your switch to the router by putting a QoS on the switch side.

qasimkhans Fri, 11/22/2013 - 17:14
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but how is this possible a router cannot handle more than 20mb but switch can handle it.

Leo Laohoo Fri, 11/22/2013 - 17:59
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but how is this possible a router cannot handle more than 20mb

Seriously?  You expect a small 2900 router, with GigabitEthernet interface, can handle full-blown Gigabit speed?  This means every man-and-his-donkey can just put a cheap 2900 into a MPLS network and expect to push 1 Gbps?  Not possible. 


If you want to push 1 Gbps, per interface or per chassis, you need to look at a bigger chassis.  Cisco is not the only one who do this.  Every network gear manufacturer do this practice.

Leo Laohoo Fri, 11/22/2013 - 18:48
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my router is 3845.

3845 can't push 1 Gbps per interface or even 1 Gbps per chassis. 


Better shape the bandwidth between the switch and the router.


Another easier method is to configure the switch interface to operate in 100 Mbps (Command:  speed auto 10 100).

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