Spanning Tree Protocol
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Posted by vicky on June 5, 2008, 6:38 am
Please log in for more thread options This is a physical topology of network. ------------------------| | | | layer | | 2 | | Switch 1 |------------------------ -------------------- | | | | | | | | | ------------------------| -------------------- | | | layer 2 | | layer |-----------------| switch (3) | | 2 | | | | Switch (2) | | | ----------------------- -------------------- | | | | | | - | | | | | 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 | layer | | 2 | | Switch 1 |-------------------------------------- desgnated port -------------------- | | desgnated port | | | | | | X (this path is blocked by STP) -------------------------| -------------------- | | | layer 2 | | layer |--------------------------| switch (3) | | 2 | desgnated port | | | Switch 2 | | | ------------------------ -------------------- | | | | | | - | | | | | 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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Posted by vicky on June 5, 2008, 6:41 am
Please log in for more thread options --------------------------------------------------------------------- This is a physical topology of network. -------------------| | | | layer | | 2 | | Switch 1 |------------------------ -------------------- | | | | | | | | | --------------------| -------------------- | | | layer 2 | | layer |-----------------| switch (3) | | 2 | | | | Switch 2 | | | -------------------- -------------------- | | | | | | - | | | | | 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 | layer | | 2 | | Switch 1 |------------------------ desgnated port -------------------- | | desgnated port | | | | | | X (this path is blocked by STP) --------------------| -------------------- | | | layer 2 | | layer |-----------------| switch (3) | | 2 |desgnated port | | | Switch 2 | | | -------------------- -------------------- | | | | | | - | | | | | 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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Posted by Rich Seifert on June 5, 2008, 12:15 pm
Please log in for more thread options 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 Networks and Communications Consulting 21885 Bear Creek Way (408) 395-5700 Los Gatos, CA 95033 (408) 228-0803 FAX Send replies to: usenet at richseifert dot com | ||||||||||||||||||||||||||||||||||
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Posted by vicky on June 6, 2008, 1:32 am
Please log in for more thread options 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???? >
ting
> 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= > =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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Posted by Martijn Lievaart on June 6, 2008, 3:04 am
Please log in for more thread options On Thu, 05 Jun 2008 22:32:10 -0700, vicky wrote:
You have twice been asked to post in a fixed font. Your schemas are unreadable to most of us. Not taking the basic courtesy of making your post readable for everyone is quite annoying. I might have helped, but simply CANNOT, as I cannot figure out your schemas. Please apply some basic nettiquette! M4 | ||||||||||||||||||||||||||||||||||
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>
> This is a physical topology of network.
>
> ------------------------|
> | |
> | layer |
> | 2 |
> | Switch 1 |------------------------
> -------------------- |
> | |
> | |
> | |
> | |
> ------------------------|
> --------------------
> | | | layer
> 2 |
> | layer |-----------------| switch
> (3) |
> | 2 |
> | |
> | Switch (2) |
> | |
> -----------------------
> --------------------
> | | |
> | | |
> - | |
> | | |
> 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
> | layer |
> | 2 |
> | Switch 1
> |-------------------------------------- desgnated port
>
> -------------------- |
> | desgnated
> port |
>
> | |
>
> | |
>
> | X (this path is
> blocked by STP)
>
> -------------------------|
> --------------------
> | | |
> layer 2 |
> | layer
> |--------------------------| switch (3) |
> | 2 | desgnated port
> | |
> | Switch 2 |
> | |
>
> ------------------------
> --------------------
> | | |
> | | |
> - | |
> | | |
> 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????