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Posted by vicky on June 6, 2008, 1:32 am
wrote:
> In article
>
>
> > Now my question is , weather the ports for 3 hosts (pc1, pc2 and pc3)
> > of switch 2 are also became designated port.
> > And why????
>
> Yes. Every active port (i.e., a port onto which frames are forwarded by
> a switch) is either a Designated Port or a Root Port. Each Designated
> Bridge (switch) has one (and only one) Root Port, plus one or more
> Designated Ports.
>
> While it is difficult to see your true topology (due to the ASCII art,
> which is still not aligned in my screen view), Switch 2 in your drawing
> is apparently a Designated Bridge, with its Root Port connected to
> Switch 1 (the Root Brodge), and a number of Designated Ports, three of
> which connect to PC1, PC2, and PC3.
>
> I hope this helps.
>
> --
> Rich Seifert =A0 =A0 =A0 =A0 =A0 =A0 =A0Networks and Communications Consul=
ting
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 21885 Bear Creek Way
> (408) 395-5700 =A0 =A0 =A0 =A0 =A0 =A0Los Gatos, CA 95033
> (408) 228-0803 FAX
>
> Send replies to: usenet at richseifert dot com
----------------------------------------------------------------------------=
---------------------------------------
This is a physical topology of network.
switch
(1)----------------------------
| |
| |
| |
switch
(2)------------------------switch (3)
| | |
| | |
pc1 pc2 pc3
Now , by this topology a loop is formed among 3 of the above switches.
So after spanning tree performed a loop free (logical) topology formed
which look like......
(root switch)
switch
(1)---------------------------- desgnated port
| desgnated
port |
| |
| desgnated
port X (this path is blocked by STP)
switch
(2)------------------------switch (3)
| | |
| | |
pc1 pc2 pc3
Now my question is , weather the ports for 3 hosts (pc1, pc2 and pc3)
of switch 2 are also became designated port.
And why????
| 
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