Link utilization is very high at Serial Interface

Unanswered Question
Mar 8th, 2007


I found that the link utilization is very high at the serial interface.

Serial0/0/0 is up, line protocol is up

Hardware is GT96K Serial

Description: E1 PPP to CNHNGPEEDS101 Ckt ID: Asianetcom EDL-0017

Internet address is x.x.x.x/30

MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,

reliability 255/255, txload 106/255, rxload 249/255 =========> Heavy utilized

Encapsulation PPP, LCP Open

Open: IPCP, 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 17:12:20

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 334 ======> Pakcets drop due to circuit fully utilized

Queueing strategy: weighted fair

Output queue: 0/1000/64/334 (size/max total/threshold/drops)

Conversations 0/174/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1488 kilobits/sec

5 minute input rate 1944000 bits/sec, 464 packets/sec

5 minute output rate 828000 bits/sec, 502 packets/sec

7101691 packets input, 720372677 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

5587587 packets output, 951038153 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

0 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

I want to know what kind of traffic caused this problem. Any command for router to get that information?



I have this problem too.
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radiohead23 Thu, 03/08/2007 - 01:01


you can enable netflow using 'ip route-cache flow' on the serial interface and then use 'show ip cache flow' to view the different traffic flows going through the interface. alternatively you can use 'ip accounting output-packets' on the interface and 'show ip accounting'. netflow will show incoming flows whereas accounting will show outgoing packets.

hope this helps.

take care.


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