06-14-2002 03:15 AM - edited 03-01-2019 10:11 PM
I have a 7206VXR [ NPE-400] running 12.0(16)S8. I am experiecing rather abnormally high input queue drops on a transit network connected to one of the fast ethernets
This is affecting network performance as am seeing so many packet drops.
What could be wrong ?
Here is a sample output captured after 7 minutes of doing clear counters on the interface
gw1#show int fa4/1
FastEthernet4/1 is up, line protocol is up
Hardware is i82543 (Livengood), address is 0008.e260.0871 (bia 0008.e260.0871)
Internet address is 195.xx.xx.xx/26
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 5/255
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 00:07:12
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 21754 drops
5 minute input rate 2966000 bits/sec, 709 packets/sec
5 minute output rate 2192000 bits/sec, 1089 packets/sec
297622 packets input, 158935506 bytes
Received 0 broadcasts, 0 runts, 0 giants, 36473 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
452773 packets output, 110146983 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
06-14-2002 04:01 AM
What is the configuration of the interface? Is Fast-Swiching or CEF enabled. Is the router having to process switch every packet for some reason.
Post the configuration of the interface.
A simple way to correct *may* be to increase the size of the input queue in the case of bursty traffic like IPX.
06-14-2002 05:18 AM
below is the interface config, increase of the input queue depth , doesnt help either
interface FastEthernet4/1
ip address 195.202.69.60 255.255.255.192
no ip directed-broadcast
speed 100
full-duplex
no cdp enable
!
gw1#show int fa4/1
FastEthernet4/1 is up, line protocol is up
Hardware is i82543 (Livengood), address is 0008.e260.0871 (bia 0008.e260.0871)
Internet address is 195.xx.xx.xx/26
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 7/255
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 00:00:21
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/200, 1732 drops
5 minute input rate 2461000 bits/sec, 747 packets/sec
5 minute output rate 2930000 bits/sec, 1258 packets/sec
16405 packets input, 6879085 bytes
Received 0 broadcasts, 0 runts, 0 giants, 2739 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
27774 packets output, 7826858 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
06-14-2002 05:25 AM
You might try changing your queuing from fifo to weighted-fair.
That has helped solve some packet drops for me.
Gordon
06-14-2002 05:56 AM
Still getting the drops
gw1#show int fa4/1
FastEthernet4/1 is up, line protocol is up
Hardware is i82543 (Livengood), address is 0008.e260.0871 (bia 0008.e260.0871)
Internet address is 195.xx.xx.xx/26
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 6/255
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 00:01:53
Input queue: 0/75/4288 (size/max/drops); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/2/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 2808000 bits/sec, 754 packets/sec
5 minute output rate 2581000 bits/sec, 1160 packets/sec
69379 packets input, 31527226 bytes
Received 0 broadcasts, 0 runts, 0 giants, 7158 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast
0 input packets with dribble condition detected
111324 packets output, 29039822 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
06-17-2002 05:25 AM
Hi.
I don't think that changing the queuing will solve input queue drops!
What's your CPU load?
Rgds.
NM
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: