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Cisco 7500 router - high input drop packet.

FastEthernet8/0 have high input/output drop packet, please advice how to fine tune it. Router CPU and memory is ok. Thanks

Below is the show interface

FastEthernet8/0 is up, line protocol is up

Hardware is cyBus FastEthernet Interface, address is 0060.3edc.5700 (bia 0060.3edc.5700)

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, 100BaseTX/FX

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 6d03h

Input queue: 0/75/19175/0 (size/max/drops/flushes); Total output drops: 17875294

Queueing strategy: fifo

Output queue :0/4096 (size/max)

5 minute input rate 6000 bits/sec, 10 packets/sec

5 minute output rate 3000 bits/sec, 4 packets/sec

2309239694 packets input, 2815330998 bytes

Received 0 broadcasts, 0 runts, 0 giants, 109 throttles

5 input errors, 5 CRC, 0 frame, 0 overrun, 49162952 ignored

0 watchdog

0 input packets with dribble condition detected

2288024906 packets output, 2176370355 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 output buffer failures, 0 output buffers swapped out

FastEthernet8/0.1 is up, line protocol is up

Hardware is cyBus FastEthernet Interface, address is 0060.3edc.5700 (bia 0060.3edc.5700)

Internet address is <removed>

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

Encapsulation ISL Virtual LAN, Color 21.

ARP type: ARPA, ARP Timeout 04:00:00

FastEthernet8/0.2 is up, line protocol is up

Hardware is cyBus FastEthernet Interface, address is 0060.3edc.5700 (bia 0060.3edc.5700)

Internet address is <removed>

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

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

Encapsulation ISL Virtual LAN, Color 34.

ARP type: ARPA, ARP Timeout 04:00:00

1 REPLY
Hall of Fame Super Silver

Re: Cisco 7500 router - high input drop packet.

Hello Bryan,

There is simply too much traffic on this link.

in 6d03h you have had

2309239694 packets input, 2815330998 bytes

49162952 ignored

or the counters are fake or the octets count have wrapped many times.

you have had a 2% loss in input

and 17875294 / 2288024906 = 0.78 % outbound loss.

You are using a old FE module not a PA mounted on a VIP linecard.

You could try to shape outbound on the other side but ignored are caused by the incoming packet rate more then the traffic volume.

You can try to implement traffic-shaping for outgoing direction to minimize output drops.

Hope to help

Giuseppe

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