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Troubleshooting output drops on Cisco 7606-S

zizou6500
Level 1
Level 1

Hi Community,

 

I'm facing an issue of output drops and I'm looking for ideas/solutions to fix this. Below is the interface details : 

 

sh int gigabitEthernet 2/1
GigabitEthernet2/1 is up, line protocol is up (connected)
MTU 4470 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is LH
input flow-control is off, output flow-control is off
Clock mode is auto
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 20:37:50
Input queue: 0/1000/0/0 (size/max/drops/flushes); Total output drops: 545
Queueing strategy: fifo
Output queue: 0/1000 (size/max)
30 second input rate 257000 bits/sec, 153 packets/sec
30 second output rate 115000 bits/sec, 150 packets/sec
L2 Switched: ucast: 151226 pkt, 13976317 bytes - mcast: 406790 pkt, 55333580 bytes
L3 in Switched: ucast: 28242315 pkt, 23861594658 bytes - mcast: 1448761 pkt, 94740496 bytes mcast
L3 out Switched: ucast: 33417728 pkt, 26160315623 bytes mcast: 2181321 pkt, 160731409 bytes
30384032 packets input, 24034608433 bytes, 0 no buffer
Received 1963529 broadcasts (1449597 IP multicasts)
0 runts, 14302526 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
0 input packets with dribble condition detected
36223875 packets output, 26355162646 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
5 Replies 5

balaji.bandi
Hall of Fame
Hall of Fame

It requires more information rather just interface output.

 

1.how these port connected and where it connected ( what device is this , Switch or router or provider network)

2. I have noticed you have Media Type LH, is this point to point to Link ( do you see same errors other side ?

3. Do you run any encryption ? on this device ?

4. can you post show version, show process cpu history and show process cpu | ex 0.00%

 

 

for other reference troubleshooting :

 

https://www.cisco.com/c/en/us/support/docs/routers/7200-series-routers/110850-queue-limit-output-drops-ios.html

 

 

 

BB

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 Hi,

 

Thank you for your help. Below the response to your questions : 

 

1.how these port connected and where it connected ( what device is this , Switch or router or provider network)

--> Router

2. I have noticed you have Media Type LH, is this point to point to Link ( do you see same errors other side ?)

-->Point to point // No errors on the other side

3. Do you run any encryption ? on this device ?

-->No

4. can you post show version, show process cpu history and show process cpu | ex 0.00%

 

 

sh version : 

 

Cisco CISCO7606-S (M8500) processor (revision 1.1) with 917504K/65536K bytes of memory.
Processor board ID FXS1703Q20X
BASEBOARD: RSP720
CPU: MPC8548_E, Version: 2.1, (0x80390021)
CORE: E500, Version: 2.2, (0x80210022)
CPU:1200MHz, CCB:400MHz, DDR:200MHz,
L1: D-cache 32 kB enabled
I-cache 32 kB enabled

Last reset from power-on
21 Virtual Ethernet interfaces
100 Gigabit Ethernet interfaces
16 Ten Gigabit Ethernet interfaces
3964K bytes of non-volatile configuration memory.

500472K bytes of Internal ATA PCMCIA card (Sector size 512 bytes).
Configuration register is 0x2102

 

show process cpu history

 


233333333332222233333333332222222222222223333333333111112222
100
90
80
70
60
50
40
30
20
10
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per second (last 60 seconds)





1
648443445444356443447445453344344445343443446333443344444434
100
90
80
70
60
50
40
30
20 *
10 * * * ** * * * * *
0....5....1....1....2....2....3....3....4....4....5....5....6
0 5 0 5 0 5 0 5 0 5 0
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%





111111111121111111111111111111211 111111121112111111111122111211111111
872379924608297189518498795293017777222572407620279329275801797034912377
100
90
80
70
60
50
40
30
20 ** *** *** ** *** * ***** * * * ** *** * ** * ********* *
10 **********************************************************************
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%

 

show process cpu | ex 0.00%
CPU utilization for five seconds: 2%/0%; one minute: 2%; five minutes: 2%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
29 104385548 1257159864 83 0.07% 0.06% 0.07% 0 IPC Seat Manager
222 501004908 2195238060 228 0.15% 0.12% 0.13% 0 IP Input
257 455916 406552788 1 0.07% 0.07% 0.07% 0 Ethernet Msec Ti
302 62107292 151494934 409 0.07% 0.04% 0.03% 0 XDR mcast
381 85034184 104966716 810 0.07% 0.06% 0.05% 0 HIDDEN VLAN Proc
488 273475728 879094690 311 0.79% 0.43% 0.41% 0 Port manager per
553 15825156 1238748654 12 0.07% 0.07% 0.07% 0 PIM Process
568 15234756 513783806 29 0.07% 0.05% 0.05% 0 IP SLA Responder
569 500780 421085350 1 0.15% 0.09% 0.08% 0 IP SLAs Event Pr
582 106746360 3134180305 34 0.15% 0.14% 0.15% 0 OSPF-1 Hello

  

Thank you for the information, as per the output i do not see a major issue here, as asked other mates here..do you see a performance issue?

 

even though the link terminated 1GB link, what is the real bandwidth assured from a provider ?

If you NMS, do you see any time the traffic bursting more than expected?

Reset the interface counters and observe again how frequently they increase, ?

If this is your high outgoing interface some time i see and it was expected, as long as no performance effecting, or any users have issue, or any application performance issue, ( i believe you can ignore it).

 

 

 

 

 

BB

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Joseph W. Doherty
Hall of Fame
Hall of Fame
Often output drops are due to microbursts.

Considering your number of drops vs. outputted packets, why are you concerned?

Hello,

 

your output drops are 0.0015 percent of total output packets. Are users or applications experiencing any noticeable problems ?

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