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many drop packets on vlan interfaces.


I need help with the following problem. In the show interface vlan below showing thatthere are many packages drops:

Vlan864 is up, line protocol is up

  Hardware is EtherSVI, address is aca0.160b.b240 (bia aca0.160b.b240)

  Description: vlan Clinica1

  Internet address is

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

     reliability 255/255, txload 12/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not supported

  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 9w0d

  Input queue: 0/75/234979/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 2906000 bits/sec, 3410 packets/sec

  5 minute output rate 47946000 bits/sec, 6264 packets/sec

  L2 Switched: ucast: 16121442 pkt, 7537891871 bytes - mcast: 7349474 pkt, 955799439 bytes

  L3 in Switched: ucast: 6197943355 pkt, 882633089706 bytes - mcast: 0 pkt, 0 bytes mcast

  L3 out Switched: ucast: 32120770166 pkt, 37230386116785 bytes mcast: 0 pkt, 0 bytes

     14544321917 packets input, 1583735924247 bytes, 0 no buffer

     Received 12783465 broadcasts (0 IP multicasts)

     0 runts, 0 giants, 4279 throttles

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

     32352034906 packets output, 37490641944675 bytes, 0 underruns

     0 output errors, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

Please could you help me with this problem?

thanks in advance


many drop packets on vlan interfaces.


i m not sure you really have a problem considering the dropped packets.

You have 234979 dropped packets, and a total of 14 billion something packets input.

So not many packets %-wise are dropped considering the total amount of input.

Yet, it is not sure when the packets are dropped.

If i were you i d clear the counters of this interface and check the interface again upcoming days/weeks for drops and input packet and how they relate %-wise.

FI. I also see drops in our network on highly utilized interfaces, but when i do some math its about 0,001 % drops compared to the amount of input packets.  I can live with that.