Output queue drops
I just recently cleared the counters on this, and I see this below. Customer states the internet is 'slow'. They have a full 100mbs connection no policy added to interface. I have increased the hold queue as you can see, but still have drops. My question is, why isnt the output queue showing any activity? It still shows 0/150 (size/max) even when its dropping. Shouldnt this number be a percentage or atleast a 150/150 when it starts dropping so you can try to figure out where a value should be?
reliability 255/255, txload 10/255, rxload 1/255
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2828
Queueing strategy: fifo
Output queue: 0/150 (size/max)
30 second input rate 438000 bits/sec, 312 packets/sec
30 second output rate 3925000 bits/sec, 466 packets/sec
I am still plagued with this problem. Hopefully I will have some real answers next week with whats going on. I have a Cisco rep coming into town and should be able to work at this all week.
It appears to be strictly switch related. Going from a 1GIG interface from the core, down to 10mbs seems to be where the output drops are happening on the customers interface. I have moved a all policing/shaping onto the 1GBS core link, and still get drops. Although it is not as bad as it used to be.... I have also reconfigured the Ethernet interface to be 'auto' rather than hard coded so the customer is free to use whatever port speed they want and its rate shaped off another port.
Does anyone else have problems with this ME3400 line from Cisco? Is anyone else seeing the massive output drops?
If not, would love to see a sample config on an Internet link type of setup and a P2P setup config...
Similar Messages
-
Hi, i have a phone thats no working fine, it unregister all the time from the sip server.
The port connected to the phone has output queues dropped on queue 1. ¿That's normal? ¿What could be the cause that there drop packet?
Thanks!
I have this configuration for Qos on the switch port:
interface FastEthernet0/15
switchport mode access
switchport voice vlan 15
priority-queue out
mls qos trust cos
spanning-tree portfast
sh mls qos int fa0/15 st
FastEthernet0/15 (All statistics are in packets)
dscp: incoming
0 - 4 : 184994 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 2298420 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 4806226 0 16934 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
0 - 4 : 8134930 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 861 0 0 0 0
45 - 49 : 0 0 0 5 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
0 - 4 : 875001 0 0 0 0
5 - 7 : 6544104 0 0
cos: outgoing
0 - 4 : 8781009 3 6 1 2
5 - 7 : 275463 5 17983
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 292615 0 0
queue 1: 8562114 44049 5388502
queue 2: 0 0 0
queue 3: 17982 0 183824
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 5349 0 0
queue 2: 0 0 0
queue 3: 0 0 0
Policer: Inprofile: 0 OutofProfile: 0Martin,
Refer to this link you need to modify your buffers etc. :http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3750-series-switches/116089-technote-switches-output-drops-qos-00.html
-Terry
Please rate all helpful posts -
OID for "output queue drops" ?
Hi All!
We use Zenoss Enterprise to monitor our ~ 3200 Cisco devices. We have successfully been able to use OIDs such as 1.3.6.1.2.1.2.2.1.20 and 1.3.6.1.2.1.2.2.1.14 to keep an eye on ifInErrors and ifOutErrors. However, we need to monitor the transmit output queue drops, i.e. the stat reported via sh int <interface> :
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 405496
Please be gentle with me - I am NOT a SNMP guru. (I think it ought to be called CNMP - Complex Network Management Protocol ;-) . But, a starting point would be an OID that reports that value, even if it is a simple counter, we can take it from there.
Here's a screen shot of the Performance Template that is workin for montitoring other data:
Thanks!
SteveSuccess! Found it here:
http://tools.cisco.com/Support/SNMP/do/BrowseOID.do?local=en&translate=Translate&objectInput=1.3.6.1.4.1.9.2.2.1.1.27
Thanks for being there for me, people - no really, I'm never sarcastic. Sometimes nothing does the trick like a little peer pressure combined with Mr. Google. This is a great forum with a very easy to use engine.
Here are the results from Zenoss:
Executing command
snmpwalk -cxxxxx -v2c 10.254.248.6 1.3.6.1.4.1.9.2.2.1.1.27
against ECB-3560G-1A.6.episd.org
SNMPv2-SMI::enterprises.9.2.2.1.1.27.1 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.248 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.5004 = INTEGER: 16846
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10101 = INTEGER: 110287486
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10102 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10103 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10104 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10105 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10106 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10107 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10108 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10109 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10110 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10111 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10112 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10113 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10114 = INTEGER: 9
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10115 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10116 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10117 = INTEGER: 6020
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10118 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10119 = INTEGER: 622
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10120 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10121 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10122 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10123 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10124 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10125 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10126 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10127 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10128 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10129 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10130 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10131 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10132 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10133 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10134 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10135 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10136 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10137 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10138 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10139 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10140 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10141 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10142 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10143 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10144 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10145 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10146 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10147 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10148 = INTEGER: 57735401
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10149 = INTEGER: 16846
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10150 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10151 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10152 = INTEGER: 0
SNMPv2-SMI::enterprises.9.2.2.1.1.27.10501 = INTEGER: 0
Steve -
3560 mls qos - output queues counters?
Hi!
I have WS-C3560G-24TS 15.0(2)SE4.
In gi0/10 we received IPTV multicast traffic only.
interface GigabitEthernet0/10
description IPTV
switchport access vlan 929
switchport mode access
switchport nonegotiate
mls qos trust dscp
channel-protocol lacp
channel-group 3 mode active
service-policy input iptv-cos
end
on port input - 350mbit - output 2000 Bit/s!
Queueing strategy: fifo
5 minute input rate 348797000 bits/sec, 32008 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
Then i send command:
clear counters
clear mlq qos int stat
and
sh mls qos int gi0/10 st
after 5-10 seconds i see:
GigabitEthernet0/10 (All statistics are in packets)
dscp: incoming
0 - 4 : 156657 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
0 - 4 : 4 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
0 - 4 : 156661 0 0 0 0
5 - 7 : 0 0 0
cos: outgoing
0 - 4 : 4 0 0 0 0
5 - 7 : 0 0 0
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 4 0 0
queue 2: 0 0 0
queue 3: 0 0 112066
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 0 0 0
queue 2: 0 0 0
queue 3: 0 0 0
Policer: Inprofile: 0 OutofProfile: 0
Question!
Why i have 112066 packets in output queue 3, then bitrate output - 5 minute output rate 0 bits/sec, 0 packets/sec and 7 packets output, 576 bytes after clear.I have any time this bitrate.
a few hours later I see:
bm18.lan#sh mls q int gi0/10 st
GigabitEthernet0/10 (All statistics are in packets)
dscp: incoming
0 - 4 : 849303034 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 3517 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
0 - 4 : 45265 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
0 - 4 : 849324148 0 0 0 0
5 - 7 : 0 0 0
cos: outgoing
0 - 4 : 45265 0 0 0 0
5 - 7 : 0 0 0
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 45265 0 4071
queue 2: 0 0 0
queue 3: 0 0 605666519
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 0 0 0
queue 2: 0 0 0
queue 3: 0 0 0
Policer: Inprofile: 0 OutofProfile: 0
send:
bm18.lan#sh mls q int gi0/10 st
GigabitEthernet0/10 (All statistics are in packets)
dscp: incoming
0 - 4 : 849303034 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 3517 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
0 - 4 : 45265 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
0 - 4 : 849324148 0 0 0 0
5 - 7 : 0 0 0
cos: outgoing
0 - 4 : 45265 0 0 0 0
5 - 7 : 0 0 0
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 45265 0 4071
queue 2: 0 0 0
queue 3: 0 0 605666519
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 0 0 0
queue 2: 0 0 0
queue 3: 0 0 0
Policer: Inprofile: 0 OutofProfile: 0
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#clear mls qos int st
bm18.lan#
bm18.lan#
bm18.lan#clear counters
Clear "show interface" counters on all interfaces [confirm]
bm18.lan#
bm18.lan#
bm18.lan#
bm18.lan#sh mls qos int gi0/10 st
GigabitEthernet0/10 (All statistics are in packets)
dscp: incoming
0 - 4 : 1141981 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 3 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
0 - 4 : 92 0 0 0 0
5 - 9 : 0 0 0 0 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 0 0 0 0 0
45 - 49 : 0 0 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
0 - 4 : 1142010 0 0 0 0
5 - 7 : 0 0 0
cos: outgoing
0 - 4 : 92 0 0 0 0
5 - 7 : 0 0 0
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 92 0 5
queue 2: 0 0 0
queue 3: 0 0 810894
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 0 0 0
queue 2: 0 0 0
queue 3: 0 0 0
Policer: Inprofile: 0 OutofProfile: 0
bm18.lan#
bm18.lan#
bm18.lan#sh int gi0/10
GigabitEthernet0/10 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0019.e7b1.c68a (bia 0019.e7b1.c68a)
Description: IPTV
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 89/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:07, output 00:00:06, output hang never
Last clearing of "show interface" counters 00:00:37
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 351051000 bits/sec, 32219 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
1202212 packets input, 1637377057 bytes, 0 no buffer
Received 1202205 broadcasts (1202205 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 1202205 multicast, 0 pause input
0 input packets with dribble condition detected
83 packets output, 6682 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
bm18.lan#
bm18.lan#
Queue counter is reset to 0, and after 10-15 seconds I see 810,894 packets, although a sh Int gi0/10 I see only 83 outgoing packet! -
Qos using priority queue drops
I have following config for Qos.
Basically Access-list match the voip/signalling traffic & put that in High queue. I am trying to figure without hight utilization why I am seeing output drops in high queue.
7206#sh int s5/1/5:0
Serial5/1/5:0 is up, line protocol is up
Hardware is PA-MC-2T3+
Description: T1
Internet address is 172.17.133.105/30
MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec,
reliability 255/255, txload 24/255, rxload 23/255
Encapsulation HDLC, crc 16, loopback not set
Keepalive set (10 sec)
Last input 00:00:06, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:58:03
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1800
Queueing strategy: priority-list 4
Output queue (queue priority: size/max/drops):
high: 0/20/1764, medium: 0/20/0, normal: 0/15/36, low: 0/15/0
5 minute input rate 143000 bits/sec, 82 packets/sec
5 minute output rate 145000 bits/sec, 83 packets/sec
734269 packets input, 148368640 bytes, 0 no buffer
Received 708 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
734855 packets output, 148838576 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: 1536Kb/s, transmit delay is 0 flags
non-inverted data
==============================================================================
7200#sh run int s2/1/5:0
Building configuration...
Current configuration : 254 bytes
interface Serial2/1/5:0
description T1
ip address x.x.x.x
no ip redirects
no ip unreachables
no ip proxy-arp
no snmp trap link-status
priority-group 4
no cdp enable
end
====================================================================================
Define access-list to match voice/signalling traffic
access-list 140 permit udp any any range 1024 1151
access-list 140 permit udp any any range 16384 32767
access-list 140 permit udp any any eq 2427
access-list 140 permit udp any any eq 2429
access-list 140 permit udp any any eq 5060
priority-list 4 protocol ip high list 140
priority-list 4 queue-limit 20 20 15 15Hi,
your queue limit is 20 packets. This can explain the behaviour. If there are 20 packets in the queueing system waiting to be serviced any newly arriving packet will be dropped.
Basically you can have drops in any queue in any queueing system if there is a permanent overload situation. There is no magic trick, if you f.e. permanently send 2 Mbps voip towards a T1. There will be drops.
QoS does not create resources, it just distributes them among your important traffic classes.
Besides this I also would suggest you to use class based queueing based on Modular QoS CLI (MQC). It is more flexible and precise than the old legacy methods like priority queueing, which you are using. On the other hand, if this is sufficient for you, why not.
Regards, Martin -
Hi guys I am having lot of input queue drops on one of our remote router which has got an ipsec protected gre tunnel towards our main branch
Input queue: 0/75/168173/8 (size/max/drops/flushes); Total output drops: 0
Throttle count 37
Drops RP 1770332 SP 0
This is the output of an interface connecting to ISP
The other thing I would like to mention here is we have some users who connects via cisco vpn client to other sites over an already established ipsec/gre tunnel so would that be a reason of having drops?
Do I need to alter the mtu for an additional gre overhead of second tunnel
Currently tunnel interface settings are
ip mtu 1476
ip tcp adjust-mss 1380
Many thanksDisclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
Input queue drops can be an indication of process switching (which is unable to keep up with what's offered).
If it's just short bursts, increasing the input queue value might mitigate.
Have you reviewed Cisco's documents for troubleshooting this?
BTW, if your GRE tunnel is "protected", the MTU is likely too large as might also be your MSS adjust.
If you're just doing GRE, your MSS adjust is too small. -
We have started to install ME2600X as access switch for FTTH
Trunk ports are configured with rep and service instances
These interfaces are facing Cat 4500X switches with rep edge ports. Northbound is a 6880X VSS and this is connected to the legacy network consisting of a couple of Cat6500 + loads of Catalyst switches
We see loads of input queue drops in ME 2600X on the trunk interfaces. Even if I limit the allowed vlans out from the 4500X to the ME2600X the amount of dropped packets are still about half of the number of packets received on the interface.
Captured traffic going out of the Cat4500X towards the ME 2600X showed mostly what I suspect is REP traffic. "Show mac traffic interface" show that all packers dropped are destined for "RP".
We do not have clients on any ports yet so all traffic are inbound to the switch
I need info and help troubleshooting this. What are the criteria for drops and how do I find what is dropped on this model?Config of REP port except the service instances
interface TenGigabitEthernet0/45
description TRAMAN-STH-02
no ip address
carrier-delay msec 200
rep segment 1
no keepalive
soak link notification 10
ip dhcp snooping trust
l2protocol peer cdp lacp
l2protocol forward stp vtp dtp pagp dot1x
Here is an example of the amount of drops ver input
Switch#show int te0/45
Input queue: 0/75/337/0 (size/max/drops/flushes); Total output drops: 0
5 minute input rate 59000 bits/sec, 10 packets/sec
2659 packets input, 1976424 bytes, 0 no buffer
Received 745 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
Switch#show int te0/45 summ
*: interface is up
IHQ: pkts in input hold queue IQD: pkts dropped from input queue
OHQ: pkts in output hold queue OQD: pkts dropped from output queue
RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)
TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)
TRTL: throttle count
Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL
* Te0/45 0 533 0 0 64000 16 3000 3 0
switch#show int te0/45 switching
TenGigabitEthernet0/45 TRAMAN-STH-02
Throttle count 0
Drops RP 5491108 SP 0
SPD Flushes Fast 0 SSE 0
SPD Aggress Fast 0
SPD Priority Inputs 0 Drops 0
Protocol CDP
Switching path Pkts In Chars In Pkts Out Chars Out
Process 17267 8029155 19179 7690779
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
Protocol Other
Switching path Pkts In Chars In Pkts Out Chars Out
Process 0 0 1150382 109509702
Cache misses 0 - - -
Fast 0 0 0 0
Auton/SSE 0 0 0 0
NOTE: all counts are cumulative and reset only after a reload. -
Output packets drops on Router interface
Hi,
As shown in attached diagram we have connected DC and site with two ISP.
RTR1 and RTR2 are in HSRP mode and RTR2 is active router for site
We are seeing packet drops on DC RTR2 interfece connected to Sprint MPLS.
We have a site with two isp (Sprint MPLS and P2P link). Site is running on Sprint ISP.
We are seeing out put errors on DC RTR2 Sprint interface, when we failover site to P2P link from sprint.
And when fail over back to Sprint at site we are not seeing any output packets drops on DC RTR2 sprint link.
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 36/255, rxload 12/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is RJ45
output flow-control is XON, input flow-control is XON
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 1w0d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 82137
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 4722000 bits/sec, 1449 packets/sec
5 minute output rate 14469000 bits/sec, 2088 packets/sec
601690470 packets input, 1836920253 bytes, 0 no buffer
Received 134822 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 134790 multicast, 0 pause input
0 input packets with dribble condition detected
858756749 packets output, 2658785694 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped outSh int
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 36/255, rxload 12/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is RJ45
output flow-control is XON, input flow-control is XON
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 1w0d
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 82137
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 4722000 bits/sec, 1449 packets/sec
5 minute output rate 14469000 bits/sec, 2088 packets/sec
601690470 packets input, 1836920253 bytes, 0 no buffer
Received 134822 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 134790 multicast, 0 pause input
0 input packets with dribble condition detected
858756749 packets output, 2658785694 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out -
Calls in queue drop when first call is answered
When all agents are busy and there are multiple calls in queue, at the point a call gets routed to an agent and answered from queue, the other calls in queue hear the disconnect prompt.
This is CME 9.1 on Version 15.0(1r)M16
application
service queue flash:app-b-acd-2.1.2.3.tcl
param queue-len 30
param aa-hunt1 7426701
param queue-manager-debugs 1
param number-of-hunt-grps 1
service KCC flash:app-b-acd-aa-2.1.2.3.tcl
paramspace english index 1
param handoff-string KCC
paramspace english language en
param call-retry-timer 15
param service-name queue
param drop-through-option 1
param second-greeting-time 60
paramspace english location flash:
param drop-through-prompt _TYFC.au
param send-account true
param max-time-vm-retry 3
param voice-mail 1426900
param max-time-call-retry 1400
param aa-pilot 7427701
param number-of-hunt-grps 1
Thanks in advance.
HHeTry this , see if that helps...
param queue-len number
Router(config-app-param)# param queue-len 15
Sets the maximum number of calls allowed in each ephone hunt group's call queue used by Cisco Unified CME B-ACD.
•number—Number of calls that can be waiting in the call queue for each ephone hunt group. The range is from 1 to 30. The default is 10. -
Total output drops & dot1dBridgeEventsV2
I am seen a lot of "Total output drops: " in the LAN/WAN Router, does any one have any documents that plains the cause of "Total output drops" and what it it's?
Also I am getting a lot of traps in the LAN, but I can't find documents that explains the event, "dot1dBridgeEventsV2" Can you guys guide me to a document where it explains the events?
ThanksTotal output drops is the number of packets in the output queue that have been dropped because of a full queue. Check out the following link for troubleshooting input queue drops and output queue drops :
http://www.cisco.com/warp/public/63/queue_drops.html -
How do I track down QOS "Aggregate Drops" in a 6807-VSS switch?
IOS = 15.1(2)SY1
When I do a "show platform qos" everything looks good except for this:
----- Switch [1], Module [3] -----
Counter IFE Pkts IFE Bytes OFE Pkts OFE Bytes
Policing Drops 0 0 216304 16888896
Policing Forwards 2935238201 5068976519092 2949830653 5069751062945
Police-hi Actions (Lvl3) 0 0 0 0
Police-lo Actions (Lvl2) 0 0 0 0
Aggregate Drops 0 0 263889 16888896
Aggregate Forwards 2935238198 5068976518864 2949830650 5069751062717
Any idea if these drops are QOS related and/or how to get more information about them in order to troubleshoot? OFE means 'Output Forwarding Engine'. There are no input or output queue drops on any of the interfaces doing a "show interface gx/x/x."
Thanks.Aggregate drops is just a total of drops from all the different internal processes. The OFE Bytes matches the policing drops. I'd assume policing is what caused these drops. The packet number difference may be due to fragmentation.
-
when i configure WFQ on an interface, i see a parameter called available bandwidth on the sh interface command which is less than the actual interface bandwidth. And if the traffic exceeds the available bandwidth then will result in output queue drops.
also i found that changing the interface bandwidth to any arbitrary value changes these parameters as well. ( eg. if i ahve a 1 MB interface and i configure the bandwidht statement as 10 MB, the available bandwidth shows around 8MB) . will it mean then, it will not show drops till the traffic exceeds 8 MB.
please make me understand how this is calculated and how does it affect the interface parameters like queuing etc.Hello,
in case you use WFQ configured on an interface, the configured "bandwidth" has no influence on the queueing behaviour. Software based queueing (like WFQ in a router) will be involved, when the hardware queue is full, i.e. when there is more traffic than the interface can send at the time. You can never send more traffic than the layer1 clock rate allows you to send - no matter what you configure with the interface command "bandwidth".
In case you configure CBWFQ through a policy-map, then the configured interface "bandwidth" is used to calculate the bandwidth per class within percent based CBWFQ. Again this will only make sense if you adjust the interface "bandwidth" to the clock rate.
Hope tis helps! Please rate all posts.
Regards, Martin -
Catalyst 2960-S Stack Interface Packet Drop
Hi all!
I have a 2960-S stack with the following behavior:
SWITCH#sh int g1/0/26
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 12275
When I issue the show mls qos interface g1/0/26 statistics:
SWITCH#show mls qos interface g1/0/26 statistics
GigabitEthernet1/0/26 (All statistics are in packets)
dscp: incoming
0 - 4 : 35356866 0 0 0 0
5 - 9 : 0 0 0 2 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 0 0 0 0
20 - 24 : 0 0 0 0 0
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 634354 0 0 0 0
45 - 49 : 0 49446819 0 0 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 0 0 0 0
60 - 64 : 0 0 0 0
dscp: outgoing
0 - 4 : 6835883 0 0 0 0
5 - 9 : 0 0 0 43973612 0
10 - 14 : 0 0 0 0 0
15 - 19 : 0 1 0 0 0
20 - 24 : 0 0 0 0 204586
25 - 29 : 0 0 0 0 0
30 - 34 : 0 0 0 0 0
35 - 39 : 0 0 0 0 0
40 - 44 : 2 0 0 0 0
45 - 49 : 0 2215325 0 55 0
50 - 54 : 0 0 0 0 0
55 - 59 : 0 29668 0 0 0
60 - 64 : 0 0 0 0
cos: incoming
0 - 4 : 35374153 2 0 0 0
5 - 7 : 50121685 0 0
cos: outgoing
0 - 4 : 12975602 43973617 85081 204622 122
5 - 7 : 47659950 105 34377016
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 47659935
queue 1: 92482 1222278 34432039
queue 2: 0 0 13178400
queue 3: 0 0 43982889
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 71
queue 1: 0 1738 0
queue 2: 0 0 20
queue 3: 0 0 375553
Policer: Inprofile: 0 OutofProfile: 0
I need some help to read this output but it seems that packets are dropped at all queues, isn't it?
Any help please?
Thanks in advance!Please post the output to the following commands:
1. sh interface G1/0/26; and
2. sh controll e G1/0/26
What kind of client is connected to port Gi1/0/26? -
Hi,
i have a 3750 with 12.2.55SE7 and he has some output queue 3 dropps at threashold 3. As far as i remember the threshold three is a static parameter on the switch. In fact that there is only a telephone located at this port it is not easy to explain those dropps. We also noticed some retransmissions at the telephone so i need to find out if they match the dropps.
Here are some outputs:
Q1/Q0 ist a Prio queue, Q2 for Best Efford, Q3 for signalling in this case
output queues enqueued:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 388077
queue 1: 147456 123815 2572166
queue 2: 0 0 333504
queue 3: 0 0 176711
output queues dropped:
queue: threshold1 threshold2 threshold3
queue 0: 0 0 0
queue 1: 0 0 0
queue 2: 0 0 13
queue 3: 0 0 0
#sh mls qos int gi x/x/x queueing
GigabitEthernetx/x/x
Egress Priority Queue : enabled
Shaped queue weights (absolute) : 25 0 0 0
Shared queue weights : 1 30 35 5
The port bandwidth limit : 100 (Operational Bandwidth:100.0)
The port is mapped to qset : 1
So the mapping of the dscp to queues is not relevant here because we talk only of a phone - so someone have any suggestion what causes this T3 @ Q3 (q2 in the output) causing to dropp packets on a phoneport ?
Many Thanks !I would say that 13 drops is not very many at all. I do notice they are on Q2, whereas you say that your voice is on Q1 and your signalling on Q3. I would therefore be searching for bursty background traffic, possibly on the access VLAN rather than the voice VLAN. Do all the phone ports show these drops? How is the access port configured ... do you have access VLAN and voice VLAN?
Kevin Dorrell
Luxembourg -
Underruns and output buffer failures
Hi
I have two Catalyst 3550 connecting two datacenter and I'm receiving errors on connecting switchports. Errors are output buffer failures and underruns. Is it just that switches are running out of resources or what? We are using servers in the datacenters with nfs and I'v heard that this could cause these errors. I'd really appreciate a opinion from a network professional.
Here are port statistics. Both switchports are identical.
FastEthernet0/3 is up, line protocol is up
Hardware is Fast Ethernet, address is 000c.301f.c503 (bia 000c.301f.c503)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 3/255, rxload 6/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s
input flow-control is off, output flow-control is off
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 21:54:22
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue :0/40 (size/max)
1 minute input rate 2676000 bits/sec, 531 packets/sec
1 minute output rate 1432000 bits/sec, 528 packets/sec
123525330 packets input, 166317380 bytes, 0 no buffer
Received 887720 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 671127 multicast, 0 pause input
0 input packets with dribble condition detected
108650060 packets output, 322356071 bytes, 11269 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
11269 output buffer failures, 0 output buffers swapped out
ThanksHello,
most likely, the erros are caused by your link being saturated.
I found a previous post which explains the error as following:
'The frames are being switched in hardware, since there are no output queue drops. But the hardware is attempting to put frames on the wire when it's pretty close to being saturated. Although your 1 minute average is only around 1,5 mbit, it only takes a couple millisecond long burst to fill up the hardware interface buffers and cause this error. It's probably time to add another link (forming an etherchannel) or jump to a gig interface. I don't think you can tune these hardware buffers at all to buy any additional time.'
Conclusion: your link is getting overloaded...
Regards,
GP
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