Renumbered my switch now I'm seeing high loads on interface

Answered Question
Mar 3rd, 2009
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I renumbered my 3750 switches over the weekend, and the port that my router is connected to is at > 95% load occasionally. I can't run netflow on these switches, so what do you recommend? I need to figure out why this is so high.

GigabitEthernet5/0/5 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 0015.f937.6785 (bia 0015.f937.6785)

Description: IT.glazers.info Core-Router

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 144/255, rxload 15/255

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/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 00:00:59, output 00:00:08, output hang never

Last clearing of "show interface" counters 23:32:34

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 6234000 bits/sec, 4097 packets/sec

5 minute output rate 56676000 bits/sec, 6224 packets/sec

309165083 packets input, 48492636223 bytes, 0 no buffer

Received 15889 broadcasts (0 multicasts)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 1763 multicast, 0 pause input

0 input packets with dribble condition detected

483806046 packets output, 569122503579 bytes, 0 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

0 output buffer failures, 0 output buffers swapped out


The port is trunked to the router, and I haven't noticed it in the past, but it seems that most of the time it's been at least once every 30 minutes that I'm seeing this load. Anything I should look at?


Thanks,

John

Correct Answer by Edison Ortiz about 8 years 4 months ago

You can run NetFlow on the router. It should reflect the traffic that is coming from the switch.


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Edison.

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Correct Answer
Edison Ortiz Tue, 03/03/2009 - 13:13
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You can run NetFlow on the router. It should reflect the traffic that is coming from the switch.


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John Blakley Tue, 03/03/2009 - 13:16
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Duh....good point. I've been looking at this stuff way too much today. :-)


Thanks,

John

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