Re: I ask about Total output drops on the interface tunnel.

vampirepong · ‎11-23-2010

I then show interface tunnel effect that the "Total output drops" as many do not know what caused what. What should be changed. And you help me troubleshoot this issue sir.

please, find attach files for more detail.

::sample::

DC_RT#sh int tun 402
Tunnel402 is up, line protocol is up
Hardware is Tunnel
Description: ==ADC_WAN==
Internet address is 172.29.103.13/30
MTU 1514 bytes, BW 50000 Kbit/sec, DLY 500000 usec,
     reliability 255/255, txload 67/255, rxload 15/255
Encapsulation TUNNEL, loopback not set
Keepalive set (5 sec), retries 3
Tunnel source 172.29.103.2, destination 172.29.103.1
Tunnel protocol/transport GRE/IP
    Key disabled, sequencing disabled
    Checksumming of packets disabled
Tunnel TTL 255
Fast tunneling enabled
Tunnel transmit bandwidth 8000 (kbps)
Tunnel receive bandwidth 8000 (kbps)
Last input 00:00:02, output 00:00:00, output hang never
Last clearing of "show interface" counters 3d19h
Input queue: 0/1000/0/0 (size/max/drops/flushes); Total output drops: 214560
Queueing strategy: fifo
Output queue: 0/1000 (size/max)
5 minute input rate 3069000 bits/sec, 1463 packets/sec
5 minute output rate 13234000 bits/sec, 2010 packets/sec
     124067359 packets input, 2539405689 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
     162511528 packets output, 585971124 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 output buffer failures, 0 output buffers swapped out
DC_RT#

Thank you very much.

Talha Ansari · ‎11-23-2010

I guess its a cisco 2821 router with hwic-4esw card. Are the output drops increasing continously? Try changing the load-interval to 30 seconds on the interface fas 0/0/0 and tunn 402 :

# int fas 0/0/0

# load-interval 30

# int unn 402

# load-interval 30

Monitor interfaces and see at what rate is the output drops increasing. What is the throughput of the link terminated on fas 0/0/0?

vampirepong · ‎11-23-2010

Dear Mr.Talha Ansari,

Thank you very much, I will try and I update let you know again.

Best Regards.

Mr. Amnaj Piyathamrat

Senior Network Engineer

MFEC Public Company Limited

Mobile: 085-151-1651

E-mail: amnaj@mfec.co.th

vampirepong · ‎11-23-2010

Dear Mr Talha Ansari,

Now I set "load-interval 30" on interface and tunnel. But it have "Total output drops" as well.

Best Regards.

Mr. Amnaj Piyathamrat

Senior Network Engineer

MFEC Public Company Limited

Mobile: 085-151-1651

E-mail: amnaj@mfec.co.th

Talha Ansari · ‎11-23-2010

Is the output drops increasing or is the value constant?

clear the counters and observe whether the o/p drop counter is increasing.

# clear counters

# sh int tunn 402

vampirepong · ‎11-24-2010

Dear Mr. Talha Ansari,

I clear counter on interface tun 402 about time 9.14 a.m. and now I show interface tunnel 402 again. Please you see this log at below. If you need to know more information, you can inform me.

DC_RT#sh int tun 402

Tunnel402 is up, line protocol is up

Hardware is Tunnel

Description: ==ADC_WAN==

Internet address is 172.29.103.13/30

MTU 1514 bytes, BW 50000 Kbit/sec, DLY 500000 usec,

reliability 255/255, txload 51/255, rxload 10/255

Encapsulation TUNNEL, loopback not set

Keepalive set (5 sec), retries 3

Tunnel source 172.29.103.2, destination 172.29.103.1

Tunnel protocol/transport GRE/IP

Key disabled, sequencing disabled

Checksumming of packets disabled

Tunnel TTL 255

Fast tunneling enabled

Tunnel transmit bandwidth 8000 (kbps)

Tunnel receive bandwidth 8000 (kbps)

Last input 00:00:00, output 00:00:02, output hang never

Last clearing of "show interface" counters 06:40:47

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 65463

Queueing strategy: fifo

Output queue: 0/0 (size/max)

30 second input rate 2115000 bits/sec, 1447 packets/sec

30 second output rate 10061000 bits/sec, 1910 packets/sec

32348009 packets input, 3891025031 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

41882252 packets output, 3139881031 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 unknown protocol drops

0 output buffer failures, 0 output buffers swapped out

DC_RT#

Best Regards.

Mr. Amnaj Piyathamrat

Senior Network Engineer

MFEC Public Company Limited

Mobile: 085-151-1651

E-mail: amnaj@mfec.co.th