Interface Discards

Unanswered Question
Tharak Abraham Fri, 03/05/2010 - 00:55
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Faulty cables ?

Duplex mismatch ?

Please post sh port <> and sh interface <>

Ganesh Hariharan Fri, 03/05/2010 - 03:54
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Dear Experts,

I am getting too may errors and discards on my gig interface!
what might be the possible reasons? How to fix it,
Load on the link is low but still problem persists
please help


Hi Pramod,

Check out the below link on troubleshooting erros in interfaces.

Hope that Help !!


paolo bevilacqua Fri, 03/05/2010 - 04:45
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Send the complete "show interface" and "show run interface x/x".

Kevin Dorrell Fri, 03/05/2010 - 05:30
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There can be any number of reasons.  Please post a show int to give us a clue.  Also, on load ... remember this is an average load over a time interval.  Even if the load appears to be low, you could still have had some very high peaks during the interval.  Again, a show int please.

Kevin Dorrell


Dear Experts,

Please find the details below

TEST#sh run interface gigabitEthernet 1/2

Building configuration...

Current configuration : 235 bytes
interface GigabitEthernet1/2
description test
switchport trunk allowed vlan 250,251,255
switchport mode trunk
no ip address
speed 1000
duplex full
mls qos trust dscp


TEST#sh interfaces GigabitEthernet1/2

GigabitEthernet1/2 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is 0008.7551.01ca (bia 0025.5223.0221)
  Description: TEST
  MTU 1500 bytes, BW 1000000 Kbit, 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
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:17, output 00:00:05, output hang never
  Last clearing of "show interface" counters 4w4d
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 34848511       72
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 9000 bits/sec, 17 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     50406531 packets input, 3580916491 bytes, 0 no buffer
     Received 36320795 broadcasts (27281136 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     615473 packets output, 119607884 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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


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