[c-nsp] 2901 output drops
Michael Sprouffske
msprouffske at yahoo.com
Tue Nov 5 14:13:24 EST 2013
I am seeing over a million outputs drops per day. This
is a 100Mb mpls connection that is shaping down to 10. Is there any way to
improve on my drops ? Do I need to up my queue
limit on this interface and if so, what would be a good number to use.
I’m not sure how to tweak this without breaking things. I’m really only
seeing this issue in the best effort queue.
Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M),
Version 15.0(1)M4, RELEASE SOFTWARE (fc1)
interface GigabitEthernet0/1
description QWEST ELA
ip address x.x.x.x
ip flow ingress
ip flow egress
duplex full
speed 100
service-policy output ELA_SHAPING_POLICY
GigabitEthernet0/1 is up, line protocol is up
Hardware is CN Gigabit Ethernet, address is
6400.f164.baa9 (bia 6400.f164.baa9)
Description: QWEST ELA
Internet address is 63.231.1.138/30
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 255/255, txload 17/255,
rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is RJ45
output flow-control is unsupported, input
flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:03, output 00:00:00, output hang
never
Last clearing of "show interface" counters
12w1d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total
output drops: 22927282
Queueing strategy: Class-based queueing
Output queue: 0/1000/0 (size/max total/drops)
5 minute input rate 287000 bits/sec, 233 packets/sec
5 minute output rate 6807000 bits/sec, 1215
packets/sec
1140353458 packets input, 203684093
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 watchdog, 0 multicast, 0 pause
input
GigabitEthernet0/1
Service-policy output: ELA_SHAPING_POLICY
Class-map: class-default (match-any)
3224094436 packets,
1840099533264 bytes
5 minute offered rate 6800000
bps, drop rate 21000 bps
Match: any
Queueing
queue limit 64 packets
(queue depth/total
drops/no-buffer drops) 0/22927245/0
(pkts output/bytes output)
3214611748/1831697074895
shape (average) cir 10000000,
bc 40000, be 40000
target shape rate 10000000
Service-policy :
ELA_QUEUING_POLICY
Class-map:
Priority-One (match-any)
652548002 packets, 121711798378 bytes
5
minute offered rate 364000 bps, drop rate 0 bps
Match: ip precedence 5
652547995 packets, 121711796301 bytes
5 minute rate 364000 bps
Queueing
queue
limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts
output/bytes output) 652547998/121711798085
bandwidth 40% (4000 kbps)
Exp-weight-constant: 9 (1/512)
Mean queue depth: 0 packets
class Transmitted
Random drop Tail
drop Minimum
Maximum Mark
pkts/bytes
pkts/bytes pkts/bytes
thresh
thresh prob
0
0/0
0/0
0/0
20 40
1/10
1
0/0
0/0
0/0
22 40
1/10
2
0/0
0/0
0/0
24 40
1/10
3
0/0
0/0
0/0
26 40
1/10
4
0/0
0/0
0/0
28 40
1/10
5
2859563189/528793287896
0/0
0/0
30 40
1/10
6
0/0
0/0
0/0
32 40
1/10
7
0/0
0/0
0/0
34 40
1/10
Class-map:
Priority-Two (match-any)
3787671 packets, 767947737 bytes
5
minute offered rate 0 bps, drop rate 0 bps
Match: ip precedence 4 6 7
3787671 packets, 767947737 bytes
5 minute rate 0 bps
Queueing
queue
limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts
output/bytes output) 3787671/330536833
bandwidth 20% (2000 kbps)
Exp-weight-constant: 9 (1/512)
Mean queue depth: 0 packets
class Transmitted
Random drop Tail
drop Minimum
Maximum Mark
pkts/bytes
pkts/bytes
pkts/bytes
thresh
thresh prob
0
0/0
0/0
0/0
20
40 1/10
1
0/0
0/0
0/0
22 40
1/10
2
0/0
0/0
0/0
24 40
1/10
3
0/0
0/0
0/0
26 40
1/10
4
6329811/355302154
0/0
0/0
28 40
1/10
5
0/0
0/0
0/0
30 40
1/10
6
13685632/1194240446
0/0
0/0
32 40
1/10
7
1052/1507535
0/0
0/0
34 40
1/10
Class-map:
Best-effort (match-any)
2566808274
packets, 1717522303645 bytes
5
minute offered rate 6420000 bps, drop rate 21000 bps
Match: ip precedence 0 1
2566808266 packets, 1717522295369 bytes
5 minute rate 6420000 bps
Queueing
queue
limit 64 packets
(queue depth/total drops/no-buffer drops) 0/22927245/0
(pkts
output/bytes output) 2543881025/1689309763627
bandwidth 20% (2000 kbps)
Exp-weight-constant: 9 (1/512)
Mean queue depth: 10 packets
class Transmitted
Random drop Tail
drop Minimum
Maximum Mark
pkts/bytes
pkts/bytes
pkts/bytes
thresh
thresh prob
0 11188633262/6901309576156
50899436/66626844913
23141442/29723879892
20 40
1/10
1
42293/20533986
11/9717 1/121
22 40
1/10
2
0/0
0/0
0/0
24 40
1/10
3
0/0
0/0
0/0
26 40
1/10
4
0/0
0/0
0/0
28 40
1/10
5
0/0
0/0
0/0
30 40
1/10
6
0/0
0/0
0/0
32 40
1/10
7
0/0
0/0
0/0
34 40
1/10
Class-map:
Priority-Three (match-any)
81557
packets, 5666687 bytes
5
minute offered rate 0 bps
Match: ip precedence 2 3
81557 packets, 5666687 bytes
5 minute rate 0 bps
Class-map:
class-default (match-any)
868971 packets, 91855955 bytes
5
minute offered rate 0 bps, drop rate 0 bps
Match: any
queue
limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts
output/bytes output) 14395054/20344976350
HERE IS THE POLICY MAP
class-map match-any Best-effort
match ip precedence 0 1
class-map match-any Priority-Three
match ip precedence 2 3
class-map match-any Priority-Two
match ip precedence 4 6 7
class-map match-any Priority-One
match ip precedence 5
!
!
policy-map ELA_QUEUING_POLICY
class Priority-One
bandwidth percent 40
random-detect
class Priority-Two
bandwidth percent 20
random-detect
class Best-effort
bandwidth percent 20
random-detect
class Priority-Three
policy-map ELA_SHAPING_POLICY
class class-default
shape average 10000000
service-policy ELA_QUEUING_POLICY
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