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What is the meaning of "output buffers swapped out" in serial interface ?

When I show interface in serail interface, the counter of "output buffers swapped out" is increasing, but the counter of "output buffers failure" is zero. I have serached in CCO and could not find the related doc to explain. So what cause the counter of "output buffers swapped out" increase?

Thanks!

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Accepted Solutions

Re: What is the meaning of "output buffers swapped out" in seria

Hi,

I've found output buffers swapped out = Number of packets swapped to DRAM

It seems like some packets are forced to process switching ( http://www.cisco.com/warp/public/121/inputdrops.pdf) for some reason.

See http://www.cisco.com/warp/public/63/queue_drops.pdf.

I'd also try to paste the complete sh int serial ... output

to the TAC Command Interpreter Tool (https://www.cisco.com/cgi-bin/Support/OutputInterpreter/home.pl).

Regards,

Milan

4 REPLIES

Re: What is the meaning of "output buffers swapped out" in seria

Hi,

I've found output buffers swapped out = Number of packets swapped to DRAM

It seems like some packets are forced to process switching ( http://www.cisco.com/warp/public/121/inputdrops.pdf) for some reason.

See http://www.cisco.com/warp/public/63/queue_drops.pdf.

I'd also try to paste the complete sh int serial ... output

to the TAC Command Interpreter Tool (https://www.cisco.com/cgi-bin/Support/OutputInterpreter/home.pl).

Regards,

Milan

New Member

Re: What is the meaning of "output buffers swapped out" in seria

I have captured the sh interface :

Serial1/2 is up, line protocol is up

Hardware is cxBus Serial

Internet address is 168.12.1.10/16

MTU 1500 bytes, BW 1536 Kbit, DLY 20000 usec, rely 255/255, load 6/255

Encapsulation HDLC, loopback not set, keepalive set (10 sec)

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

Last clearing of "show interface" counters 2w0d

Input queue: 0/75/0 (size/max/drops); Total output drops: 597

Queueing strategy: weighted fair

Output queue: 0/64/597 (size/threshold/drops)

Conversations 0/23 (active/max active)

Reserved Conversations 0/0 (allocated/max allocated)

5 minute input rate 413000 bits/sec, 141 packets/sec

5 minute output rate 42000 bits/sec, 26 packets/sec

70862231 packets input, 1791884212 bytes, 0 no buffer

Received 157180 broadcasts, 0 runts, 0 giants

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

20227734 packets output, 3248376574 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 827305 output buffers swapped out

0 carrier transitions

RTS up, CTS up, DTR up, DCD up, DSR up

What cause the packets are forced to process switching ?

Thanks!

Re: What is the meaning of "output buffers swapped out" in seria

Is there anything special configured on the interface (policy routing, route map, NAT, tunnel, e.g.)?

Verify if CEF is running on the interface (see http://www.cisco.com/warp/customer/105/cef_whichpath.html)

Regards,

Milan

New Member

Re: What is the meaning of "output buffers swapped out" in seria

"Fast Switching" has been enabled in the serial interface.

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