that is great info. My most recent issue that got me to chime in this time is with a particular piece of hardware, the Quantum DXi 3500.
It supports SNMP but we can't get all the "players" to agree to what's happening. Intermapper toggles between indicating 10M and 100M. The switch console says that the interface is 1G The DXi console says that it is 1G. Funny thing now that you're adding the utilization topic, even though IM shows 100M, when the DXi starts receiving data when the backup starts - it goes to 165% utilization under heavy load (orange halo). I guess the link is higher than the 100M link IM is reporting........ More confusing is that I have 3 of these things in far separated locations, all with the same firmware level, connected to the same model switch and using the same IM probe. In loc 1, IM says 100M (sometime says 10M for a short time) In loc 2, everything was great, I deleted the DXi icon and recreated it (forget why) and now it is 100M In loc 3, everything is great - I'm not going to touch that icon for fear it will go nuts. All the DXi's have the exact config, (I bring their agents on screen, side by side to compare) All react the same to utilization. Of course the 1G doesn't show anything except ants 'cause 165-200M is only 20%. I like the idea that Jakob suggested about splitting up the halo to tx/rx. Wouldn't this require being able to manually set the tx/rx speeds manually also? (not just the interface speed?) Kevin -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Richard E. Brown Sent: March-27-09 7:46 AM To: [email protected] Subject: Re: [IM-Talk] Half duplex and 10half Folks, The "Set Link Speed..." window helps InterMapper compute link utilization. (It obviously does not change the speed or duplex setting of the real interface.) This window has settings for the expected transmit and receive speeds for the link so you can _override_ the ifSpeed reported by the interface. Example: Let's say you have a 100 mbps interface on your router going into an assymetric DSL link with a max of 16mbps download and 2 mbps upload. It's useful to compute utilization separately for each direction based on those speeds, not 100 mbps of the actual interface. Setting those speeds in the "Set Link Speed..." window will do this. InterMapper has a single number for the utilization of an interface. It always reports the highest utilization on the interface. There are two cases: a) If you have checked "Full duplex", InterMapper computes the actual transmit/receive rates as a percentage of the customer-entered rates, and then reports the larger percentage. Thus if the DSL link above is receiving and sending 1.0 mbps in each direction simultaneously, InterMapper will calculate the transmit utilization as 50% and the receive utilization as 6.25%, and show the link as 50% used. b) If you have checked "Baseband", InterMapper adds the transmit and receive data rates to calculate the utilization. Thus a 10BaseT (half-duplex) link that's transmitting 3 mbps and receiving 3 mbps would be shown with a utilization of 60%. (3 mbps + 3 mpbs = 6 mbps = 60% of a 10 mbps interface.) There's also information about the link speed and duplex setting saved in the InterMapper Database. I'll send another note soon with definitive information (and sql queries) that can be used to check that information. Rich Brown [email protected] Dartware, LLC http://www.dartware.com 66-7 Benning Street Telephone: 603-643-9600 West Lebanon, NH 03784-3407 Fax: 603-643-2289 ____________________________________________________________________ List archives: http://www.mail-archive.com/intermapper-talk%40list.dartware.com/ To unsubscribe: send email to: [email protected] ____________________________________________________________________ List archives: http://www.mail-archive.com/intermapper-talk%40list.dartware.com/ To unsubscribe: send email to: [email protected]
