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I have a Cisco Catalyst 6500 with the 720 Supe card. I would like to get the upload and download utilization of a specific port. I would like it from SNMP, I have looked for the correct MIB but no luck. The port I am trying to see is gi2/23.

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    Your request is a little bit broad; "get the internet upload and download utilization" doesn't have any specific meaning in this context. Do you need the utilization of a specific port(s) on the 6500? Or the throughput across the Sup 720 iteslf? Or something else entirely? From what I can gather, a simple snmpget string executed by a server might serve you well, but I would need to know specifically what you're looking for to get more specific. – Brett Lykins Dec 18 '13 at 3:26
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    Voting to close as too broad/primarily opinion based - "the best" way doesn't mean much as the way your question is phrased and the lack of requirements/information isn't giving us much to go on to help with answering the question (as Brett has already pointed out :-) ). – John Jensen Dec 18 '13 at 4:00
  • Sorry, What I would like is the utilization of a specific port. – Jonathan Dec 18 '13 at 13:31
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    Thank you for clarifying. As it stands the question might still be too opinion based; "what is the best" can be very subjective. I would suggest taking a look at using SNMPget to pull informaton on an interface. Then asking a specific question if you get stuck. Also you may want to check out Cisco's docs on calculating usage with SNMP. – Brett Lykins Dec 18 '13 at 16:14
  • I have updated the question. – Jonathan Dec 19 '13 at 16:48
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A quick-and-dirty way to get the current utilization would be to poll these OIDs from OLD-CISCO-INTERFACES-MIB:

  • locIfInBitsSec - 1.3.6.1.4.1.9.2.2.1.1.6.x
  • locIfInPktsSec - 1.3.6.1.4.1.9.2.2.1.1.7.x
  • locIfOutBitsSec - 1.3.6.1.4.1.9.2.2.1.1.8.x
  • locIfOutPktsSec - 1.3.6.1.4.1.9.2.2.1.1.9.x

These give you the same numbers as the "input rate" and "output rate" lines from the output of show interface. Just replace the "x" with the interface index for Gig2/23 shown in show snmp mib ifmib ifindex. The MIB states that it's the "five minute exponentially-decayed moving average", but the actual rate matches whatever you've configured with load-interval on the interface (which defaults to 5 minutes).

These OIDs will give you a pretty good point-in-time measurement of the interface's utilization without requiring an external system to keep track of deltas between measurements. However, since it's an exponentially-decayed moving average, it may not be as accurate.

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