many drop packets on vlan interfaces.

jimontoro · ‎01-10-2012

hello,

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 10.181.196.1/22

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

Ton V Engelen · ‎01-10-2012

Hi

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.