Router interface utilization
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Posted by terrydoc@o2.ie on June 12, 2008, 7:25 am
Please log in for more thread options e.g. reliability 255/255, txload 100/255, rxload 122/255 - do you total the 100 (txload) and 122(rxload), get 222 and say the utilization on the interface is (222/255) 88% | |||||||||||||||||||
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Posted by Trendkill on June 12, 2008, 7:35 am
Please log in for more thread options No, the transmit and receive are mutually exclusive. tx is transmit, rx is receive, and therefore you treat them differently. I suppose you could aggregate them and then take it over 510, but I can't think of any real reason to look at it that way. Additionally, the tx/rx are averaged over a set amount of time if I recall correctly, like 5 minutes, but its using some specific calculation. Since bandwidth on circuits is full duplex (1.5 meg transmit AND 1.5 meg receive on a T1 for example), you do not aggregate tx and rx. http://www.staticnat.com/WP/2007/03/07/reliability-255255-txload-1255-rxload-1255-what-does-it-really-mean/ http://www.cisco.com/en/US/docs/ios/12_3t/inter/command/reference/int_s3gt.html | |||||||||||||||||||
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Posted by Trendkill on June 12, 2008, 7:41 am
Please log in for more thread options >
> > Hi, how do you calculate the interface utilization -
> > e.g. reliability 255/255, txload 100/255, rxload 122/255 - do you > > total the 100 (txload) and 122(rxload), get 222 and say the > > utilization on the interface is (222/255) 88% >
> No, the transmit and receive are mutually exclusive. tx is transmit, > rx is receive, and therefore you treat them differently. I suppose > you could aggregate them and then take it over 510, but I can't think > of any real reason to look at it that way. Additionally, the tx/rx > are averaged over a set amount of time if I recall correctly, like 5 > minutes, but its using some specific calculation. Since bandwidth on > circuits is full duplex (1.5 meg transmit AND 1.5 meg receive on a T1 > for example), you do not aggregate tx and rx. > > http://www.staticnat.com/WP/2007/03/07/reliability-255255-txload-1255... > > http://www.cisco.com/en/US/docs/ios/12_3t/inter/command/reference/int... So using your numbers, transmit is 100/255 or 39.2% utilized, and receive is 122/255 or 47.8% utilization. | |||||||||||||||||||
> e.g. reliability 255/255, txload 100/255, rxload 122/255 - do you
> total the 100 (txload) and 122(rxload), get 222 and say the
> utilization on the interface is (222/255) 88%