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Webcast-Catalyst9k
New Member

high discard rate interface 2960 according to smarts

                   hey,

I have the following issue , our monitoring device (smarts) says often that the treshhold of discard rate is exceeded (

.1.3.6.1.2.1.2.2.1.19

.1.3.6.1.2.1.2.2.1.13)

of the interfaces of 2960 ( WS-C2960S-48LPS-L  15.0(1)SE2            C2960S-UNIVERSALK9-M)

but I do not see may errors on the interfaces in question

any idea what it could be, a bug of somekind?

6 REPLIES
Cisco Employee

high discard rate interface 2960 according to smarts

Have a look at this.

https://supportforums.cisco.com/thread/2014402

Two most common reasons :

1. Speed/duplex mismatch

2. High traffic on the port causing the switch buffer run out.

Cheers,

-amit singh

New Member

high discard rate interface 2960 according to smarts

I am sorry but there is no duplex mismatch and also when a buffer is running out , should this not been seen in the stats of the interface?

GigabitEthernet1/0/48 is up, line protocol is up (connected)

  Hardware is Gigabit Ethernet, address is c40a.cbd3.2130 (bia c40a.cbd3.2130)

  Description: link 1 van 2 (Po-Ch 1) naar DL_BXL_A_CS01

  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, 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 00:00:12, output 00:00:20, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 709

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 1447000 bits/sec, 216 packets/sec

  5 minute output rate 353000 bits/sec, 142 packets/sec

     4835187198 packets input, 3467273375673 bytes, 0 no buffer

     Received 189534354 broadcasts (18485326 multicasts)

     0 runts, 0 giants, 0 throttles

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

     0 watchdog, 18485326 multicast, 0 pause input

     0 input packets with dribble condition detected

     4420530022 packets output, 2002468487131 bytes, 0 underruns

     0 output errors, 0 collisions, 3 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

Hall of Fame Super Gold

high discard rate interface 2960 according to smarts

Post the output to the command "sh controll e G1/0/48".

Another thing, your IOS is not recommended.  Think about using either 12.2(55)SE8 or 15.0(2)SE4.

New Member

high discard rate interface 2960 according to smarts

sh controllers ethernet-controller gigabitEthernet 1/0/48

     Transmit GigabitEthernet1/0/48           Receive
   1265759827 Bytes                       2876227289 Bytes                   
    305248619 Unicast frames               301193112 Unicast frames          
      2354520 Multicast frames               1841059 Multicast frames        
       913338 Broadcast frames              20506992 Broadcast frames        
            0 Too old frames              3751729039 Unicast bytes           
            0 Deferred frames              314558942 Multicast bytes         
            0 MTU exceeded frames         1850964379 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             2539828 Minimum size frames     
            0 8 collision frames           102434188 65 to 127 byte frames   
            0 9 collision frames            42835307 128 to 255 byte frames  
            0 10 collision frames           17318346 256 to 511 byte frames  
            0 11 collision frames           10718159 512 to 1023 byte frames 
            0 12 collision frames            9311828 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          138383507 Valid frames, too large 
            0 Excess defer frames                  0 Invalid frames, too small
       177837 64 byte frames                       0 Valid frames, too small 
    104134352 127 byte frames         
     56157656 255 byte frames                      0 Too old frames          
     20764539 511 byte frames                      0 Valid oversize frames   
     11645014 1023 byte frames                     0 System FCS error frames 
      4072065 1518 byte frames                     0 RxPortFifoFull drop frame
    111565014 Too large frames        
            0 Good (1 coll) frames    
            0 Good (>1 coll) frames   

see here the output,

why is the ios not recommended , it is still on the list of cisco downloads

Hall of Fame Super Gold

high discard rate interface 2960 according to smarts

see here the output,

The output to the command "sh controll e" is clean.  I don't see any issues here.

why is the ios not recommended

CPU and memory hog bugs.

New Member

high discard rate interface 2960 according to smarts

thx, but this is the issue , we don not see errors but still the snmp tool like smarts says there is a high discard rate, can it be a bug of some kind?

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