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What does it mean?

Answered Question
May 13th, 2003
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#sh int s0/0.1

.........................

MTU 1500 bytes, BW 512 Kbit, DLY 20000 usec,

reliability 255/255, txload 71/255, rxload 255/255


What means 255 after / ?

Correct Answer by olorunloba about 14 years 3 months ago

The Cisco IOS calculates the loading by dividing either the input or output rate by the bandwidth and multiplying by 255. In your case, the bandwidth set on the interface is 512, hence the txload (output rate) is 71 / 255 * 512 = 142kb/s, and the rxload (input rate) is 255 / 255 * 512 = 512kb/s. These values can be crosschecked by the line on the show inerface that gives the 5 minute rate average.

Note that if the wrong bandwidth is configured on the interface, the rxload and txload will not be accurate. And the ratings of these are always against 255.

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Overall Rating: 3 (2 ratings)
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rmv72 Tue, 05/13/2003 - 21:40
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Yes, this port is trunk to other switch. Is't unnormaly to have value 255/255.

And why maximum is 255 and not 100 or other?

Correct Answer
olorunloba Wed, 05/14/2003 - 10:36
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  • Silver, 250 points or more

The Cisco IOS calculates the loading by dividing either the input or output rate by the bandwidth and multiplying by 255. In your case, the bandwidth set on the interface is 512, hence the txload (output rate) is 71 / 255 * 512 = 142kb/s, and the rxload (input rate) is 255 / 255 * 512 = 512kb/s. These values can be crosschecked by the line on the show inerface that gives the 5 minute rate average.

Note that if the wrong bandwidth is configured on the interface, the rxload and txload will not be accurate. And the ratings of these are always against 255.

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