MST forwarding times CCO example confusing

From: stephen skinner (stephenski@gmail.com)
Date: Sun Oct 26 2008 - 04:30:47 ARST


hello,

can i please ask a quick question ,

i have been reading about the following command

"spanning-tree mst forward-time"

according to the CCO , it states

The forwarding time specifies how long each of the listening and learning
states last before the interface begins forwarding.

OK,

but the example on the CCO shows this

This example shows how to set the spanning-tree forwarding time to 18
seconds for all MST instances:

Switch(config)# spanning-tree mst forward-time 18

my question is ,

if the above statement about listening and forwarding states is correct ,
i.e this command covers the timer for both the listening and learning states

then shouldnt the example have a forward time of 9 ??

i beleive that they way you work out the forwarding time is as follows

listening=9 and learning=9 , 2x9 =18 in total.

the example from the CCO would be

listening=18 and learning=18 , 2x18 = 36 in total.

can someone please clarify this for me ...

many thanks

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