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How to calculate the recommended cost of BPDU?

MartyrYuan
Level 1
Level 1

"a 10Mb/s link has a recommended cost of 100, and 100Mb/s and 1000Mb/s links have recommende cost values of 19 and 4, respectively."(TCP/IP Illustrated, Volume1. 2nd Edition, Page 104)

How did they get the number of cost?

1 Reply 1

Juan Urti
Level 1
Level 1

Hi! those values are in the 802.1d specification in the IEEE.

If you look the standard, you will find this values.

Best regards

Juan

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