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[STP] Other than RP, DP and Blocking port on Switch

missingplugin

Its a very basic question i guess, A switch has Root Port, Designated Port, Or Blocking Port, but all these three kind applies when a Switch is Connected to another Switch, isn't it?

How about those ports which connects directly to host, Do those ports works Normal i.e not any one of the three modes, is that so?

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Comments

Chard26

In STP, the cables that are connected to each switch will be set up as trunk ports which STP needs to function. All the other ports will be access ports or normal ports functioning as they would without STP enabled (if that makes sense )

Cheers
Chard

bermovick

STP still runs on access ports though - ports connected to end hosts will be in a forwarding state (they'll be designated ports)

CodeBlox

As stated above, they will be designated ports on access ports. This is because they forward the least-cost BPDU onto that segment ( the host doesn't forward any ). Or so the legend goes.

DragonNOA1

missingplugin wrote: »

...but all these three kind applies when a Switch is Connected to another Switch, isn't it?

Yes, it applies when connecting to another switch as well. That port could be forwarding or blocking, and could be pointing to or away from the root (root port).

bon_chan

bermovick wrote: »

(they'll be designated ports)

I am getting confused.I thought that ports connected to end hosts were called non-designated ports

Monkerz

No, a non-designated port is a port in a blocking state. Ports connected to hosts are designated ports.

Watch this flash animation, maybe it will help clear some things up. http://www.cisco.com/image/gif/paws/10556/spanning_tree1.swf

Arpawocky

Monkerz wrote: »

No, a non-designated port is a port in a blocking state. Ports connected to hosts are designated ports.

Watch this flash animation, maybe it will help clear some things up. http://www.cisco.com/image/gif/paws/10556/spanning_tree1.swf

Holy moly. Thanks for posting this. A couple light bulbs just went off in my head.

bon_chan

Thank you this is very clear now.

SubnetZero

missingplugin wrote: »

How about those ports which connects directly to host, Do those ports works Normal i.e not any one of the three modes, is that so?

Just to echo what everyone else has already said...

Designated ports are put into a forwarding state after going through the listening > learning states (if you want to bypass this turn on portfast)
Non-designated ports are blocking and don't forward frames, however, they do listen-for and receive BPDU's

HTH