01-22-2004 04:38 AM - edited 03-02-2019 01:04 PM
I am stumped. On all of our Serial Interfaces we are getting High rate of input Flushes and out put drops. What would cause the high rate of flushes. It seems to happen in spurts during our peak utilization periods severaltimes a day, over 1 million flushes a day on our ATM and 3 million flushes on our Ethernet. However our ATM bandwidth is not even 50% utilized during these peaks.Also our CPU useage seems to Idle at a rate of 13% and gets up to 20+%, with IP input only accounting for 2-5%. Is that a normal CPU Utilization. It seems high to me, If we unplug the ATM the CPU drops to about 1%
Please Help.
Here is the Interface STats.
FastEthernet0/0 is up, line protocol is up
Hardware is DEC21140, address is 0050.2a54.9800 (bia 0050.2a54.9800)
Description: Connection to Local Network, ALL Local routed Traffic and Internet Traffic Passes through this Interface
Internet address is 67.66.10.66.1/22
MTU 1500 bytes, BW 10000000 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 17:16:42
Input queue: 0/1024/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/300/0 (size/max total/threshold/drops)
Conversations 0/24/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 363000 bits/sec, 244 packets/sec
5 minute output rate 775000 bits/sec, 302 packets/sec
26742486 packets input, 977021892 bytes
Received 90647 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
40228515 packets output, 2006872602 bytes, 0 underruns
0 output errors, 0 collisions, 2 interface resets
0 babbles, 0 late collision, 0 deferred
1 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
lFastEthernet2/0 is up, line protocol is up
Hardware is DEC21140A, address is 0050.2a54.9838 (bia 0050.2a54.9838)
Description: port to Filter outbound Web traffic to filtering device
Internet address is 10.10.10.1/30
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)
Half-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:09, output hang never
Last clearing of "show interface" counters 17:19:06
Input queue: 0/2048/0/2895400 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
5 minute input rate 76000 bits/sec, 66 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
19866952 packets input, 2007084580 bytes
Received 0 broadcasts, 0 runts, 0 giants, 12 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
21628 packets output, 6393528 bytes, 0 underruns
0 output errors, 7 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
Serial1/3:0 is up, line protocol is up
Hardware is Multichannel T1
Description: Point-to-Point T1 to remote Second Office Inet Traffic + VoIP
Internet address is 10.0.0.2/30
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 26/255, rxload 4/255
Encapsulation HDLC, crc 16, Data non-inverted
Keepalive set (10 sec)
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 16:22:10
Input queue: 0/2048/0/6510 (size/max/drops/flushes); Total output drops: 5836
Queueing strategy: priority-list 2
Output queue (queue priority: size/max/drops):
high: 0/20/0, medium: 0/40/0, normal: 0/60/5836, low: 0/80/0
5 minute input rate 27000 bits/sec, 33 packets/sec
5 minute output rate 159000 bits/sec, 49 packets/sec
4081072 packets input, 655613852 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
4108446 packets output, 1756246452 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
no alarm present
Timeslot(s) Used:1-24, subrate: 64Kb/s, transmit delay is 0 flags
ATM4/0 is up, line protocol is up
Description: 9MB of Bandwidth to Internet
Hardware is ENHANCED ATM PA
MTU 4470 bytes, sub MTU 4470, BW 40704 Kbit, DLY 190 usec,
reliability 255/255, txload 1/255, rxload 4/255
Encapsulation ATM, loopback not set
Keepalive not supported
Encapsulation(s): AAL5
4096 maximum active VCs, 1 current VCCs
VC idle disconnect time: 300 seconds
0 carrier transitions
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 17:19:07
Input queue: 0/4096/0/31491 (size/max/drops/flushes); Total output drops: 104
Queueing strategy: Per VC Queueing
5 minute input rate 684000 bits/sec, 227 packets/sec
5 minute output rate 276000 bits/sec, 217 packets/sec
18963957 packets input, 3962038455 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
24450521 packets output, 3495808224 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
ATM4/0.1 is up, line protocol is up
Hardware is ENHANCED ATM PA
01-23-2004 09:37 AM
I am very interested in your post. I to had a very similar problem a while back. I did end up with a usable solution that hasn't bitten me yet but I was never happy with it. What I did was first switch the router card with a newer model that happened to have 12.2. (I was running 12.1 at the time) I also had multiple 4mb PVCs terminating on one single DS3 card so I installed 2 more DS3 cards and separated the incoming PVC evenly over the cards 3 cards.
My reasoning for these changes were 1 I was confused because I had plenty of CPU but it was acting like I had a lag. And 2 I had tried everything possible as far as buffer size and PVC size.
Hopefully someone else has had this issue and can give you a better solution.
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