http://info-it.net/cisco/labs/ccna/r&s/ccna-labs.php

I’m so greatly to have a prompt response from you 9tut
Now, I have knowledge for these differences functionality between the two commands..
Thank a lot to you 9tut..

Note: By default, spanning tree runs on all ports of a Cisco switch.

I was confusing of these two commands between the “spanning tree@ global config” and “spanning tree @ interface config.I don’t know what command to be use for spanning tree in several vlan

Can anyone help me ;)

2d r3
r ?

d ?
1d r4

2d r3
r ?

d ?
1d r4

B) root and desiginated

In RSTP, root and designated ports are the only ones forwarding and therefore the only ones included in the active topology. All ports on the root bridge are designated ports. Each non-root bridge has a root port. Every segment has only one designated port. All other ports are not forwarding.

C) alternate and backup – RSTP introuduce alternate and backup route. Thanks

please refer to 9tut explanation on RSTP

A) root and alternate – RSTP introuduce alternate route. Thanks

please refer to 9tut explanation on RSTP

With RSTP, which two ports roles are included in the active toplogy ?
A) root and alternate
B) root and desiginated
C) alternate and backup
D) desiginated and backup

first thing first: checked wiki. it still says what it did few months back
http://en.wikipedia.org/wiki/Spanning_Tree_Protocol
“STP switch port states:
[...] Listening – The switch processes BPDUs and awaits possible new information that would cause it to return to the blocking state. It does not populate the MAC address table, but it does forward frames. [...]”

dug deeper into it, got here:
http://www.cisco.com/univercd/cc/td/doc/product/rtrmgmt/sw_ntman/cwsimain/cwsi2/cwsiug2/vlan2/stpapp.htm
“A port in the listening state performs as follows:
Discards frames received from the attached segment.
Discards frames switched from another port for forwarding.”

if cisco says IT DOESNT then this leads me to only one logical conclusion: i got it all wrong and IT DOESNT :)
there’s also a small error on wiki too. took the liberty to change that

thank you very very much anonymous poster. i learn something new everyday :)

An interface in the blocking state does not participate in frame forwarding. After initialization, a BPDU is sent to each interface in the switch. A switch initially functions as the root until it exchanges BPDUs with other switches. This exchange establishes which switch in the network is the root or root switch. If there is only one switch in the network, no exchange occurs, the forward-delay timer expires, and the interfaces move to the listening state. An interface always enters the blocking state following switch initialization.

An interface in the blocking state performs as follows:

•Discards frames received on the port

•Discards frames switched from another interface for forwarding

•Does not learn addresses

•Receives BPDUs
Listening State

The listening state is the first state an interface enters after the blocking state. The interface enters this state when STP determines that the interface should participate in frame forwarding.

An interface in the listening state performs as follows:

•Discards frames received on the port

•Discards frames switched from another interface for forwarding

•Does not learn addresses

•Receives BPDUs
Learning State

An interface in the learning state prepares to participate in frame forwarding. The interface enters the learning state from the listening state.

An interface in the learning state performs as follows:

•Discards frames received on the port

•Discards frames switched from another interface for forwarding

•Learns addresses

•Receives BPDUs
Forwarding State

An interface in the forwarding state forwards frames. The interface enters the forwarding state from the learning state.

An interface in the forwarding state performs as follows:

•Receives and forwards frames received on the port

•Forwards frames switched from another port

•Learns addresses

•Receives BPDUs
Disabled State

An interface in the disabled state does not participate in frame forwarding or STP. An interface in the disabled state is nonoperational.

A disabled interface performs as follows:

•Discards frames received on the port

•Discards frames switched from another interface for forwarding

•Does not learn addresses

•Does not receive BPDUs

In listening it does forwad frames !!!! I ve thougt forwandig frames is just in forwanding phase please confirm to me

Waiting

Thanks in advance for the gr8 help

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thanks!