19 Posts

January 29th, 2008 13:00

A good estimate is that it will take the STP (30 to 45 seconds)
with fast link should go from Blocking to forwarding almost immediately(under 5 seconds at least)
but then again, only want to do this on edge devices and not other layer 2 devices.
 
hope this helps

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54 Posts

January 29th, 2008 13:00

why only on edge devices? what do you mean by edge? last year we added Exchange 2003 to our network and i was having issues with it. when it booted some of the Exschange services would not start and had to be done manually. when i enabled fast link on this port the problem disappered Nigel

19 Posts

January 29th, 2008 14:00

edge devices:
computers, servers printers.
you want them in portfast or fastlink state to keep them from timing out with certain applications.
 
 
you are on the right road with fast link .
 
 
 

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54 Posts

January 29th, 2008 14:00

great - i was hoping you would say computers. so by enabling this i would think boot time of PCs on our domain would improve too, as the network would be found and connected quicker. would you agree?

February 3rd, 2008 11:00

The ability for the network switch to forward "user traffic" from your client PC or host sooner than 45secs which is standard spanning tree (L2 switch sequence of device contect : learning -> listening -> forwarding).

 

By using fastlink (or also known as portfast) you skip the learning, listening stages and hence speed up access to the network.

 

Caveats : Only use for PC ,Server device........not meant for router --> switch, or switch --> switch conenctions, because you could cause a broadcast storm. In normal SPT stages the port would "listen" for BPDU's (Bridge Protocol Data Units) to ensure a loop free topology - and only going into forwarding mode if safe to do so.

 

Hence must be a PC or server - as you are the decision point now !!

 

As long as you PC/Server IP stack and application build are well organised you sholud be able to access the netwotk straight away.

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