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Bandwidth utilization for physical interface vs. subinterface

In looking at the bandwidth utilization for our upstream boarder router, we're noticing something strange. The connection to our upstream provider is a fiber Gigabit interface which has 2 subinterfaces for our 2 BGP peers (Internet and Internet2). We have all three interfaces added to our NPM 9.51. It looks like the the Internet subinterface is usually about 5 or 6 Mbps higher in utilization than the main interfaces. I would have thought if there was a difference, it would be the other way around. Does anyone know why this is? Is this an Orion thing or a Cisco thing?

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mcbridea

Hmmm. Could be a counter issue. Are all 3 using 64 bit counters?

Steve_Pfister

I'm not sure... how would I tell?

Could it just be a problem with the two interfaces being polled at separate times?

mcbridea

I don't think it is an issue of asynchronous polling as we poll the device with a GETBULK so we get almost everything at the same time. As Admin -> Settings -> Manage Nodes -> Select Nodes in the Show box. Check off the ode of interest and click Edit. Check Allow 64 bit counters box, Submit.

GeorgeK

I've seen a similar effect with lower-speed interfaces where it's clearly not a 32-bit vs 64-bit issue -- in my case it was DS-1's combined into a multilink, and the sum of the individual interfaces was not exactly the same as the overlying multilink. I also thought it was attributable to asynchronous polling.