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Posted by Albert Manfredi on June 6, 2008, 4:12 pm
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> Now my question is , weather the ports for 3 hosts (pc1, pc2 and pc3)
> of switch 2 are also became designated port.
> And why????
Is there something in Rich Seifert's response, or in mine, that didn't
answer your question?
In other words, are these three ports of the switch, to which the
three hosts connect, not edge ports? If they are edge ports, then is
there something in the replies you received that isn't clear?
To draw ASCII pictures, you have to use a font in which each character
is assigned the same amount of space on the line. Try Courier font,
for example, and be sure to use a return at the end of each line.
Bert
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Posted by vicky on June 7, 2008, 5:05 am
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>
> > Now my question is , weather the ports for 3 hosts (pc1, pc2 and pc3)
> > of switch 2 are also became designated port.
> > And why????
>
> Is there something in Rich Seifert's response, or in mine, that didn't
> answer your question?
>
> In other words, are these three ports of the switch, to which the
> three hosts connect, not edge ports? If they are edge ports, then is
> there something in the replies you received that isn't clear?
>
> To draw ASCII pictures, you have to use a font in which each character
> is assigned the same amount of space on the line. Try Courier font,
> for example, and be sure to use a return at the end of each line.
>
> Bert
----------------------------------------------------------------------------=
Hello,
As some switches support MSTP, Some others support RSTP ,, so is that
switches are also compatible with those switches , which support only
STP (IEEE 802.1d).
If it is possible then please also tell me ...
Is any bits to be set for providing the compatiblity with those
switches which support MSTP or RSTP , with switch which support only
simple STP.
or it done automatically by switch hardware.
Thanks in advance.
Vikrant
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Posted by Albert Manfredi on June 7, 2008, 5:44 pm
If you were Registered and logged in, you could reply and use other advanced thread options
> =A0As some switches support MSTP, Some others support RSTP ,, so is that
> switches are also compatible with those switches , which support only
> STP (IEEE 802.1d).
>
> If it is possible then please also tell me ...
> Is any bits to be set for providing the compatiblity with those
> switches which support MSTP or RSTP , with switch which support only
> simple STP.
> or it done automatically by switch hardware.
MSTP is described in IEEE 802.1Q Clause 13.
The first important point is that MSTP is layered over RSTP (or STP).
It is used in conjunction with these 802.1D protocols. So, for
example, there will always be the common spanning tree, as created by
STP or RSTP, underlying MSTP.
One stipulation of MSTP is that all of the switches belonging to one
of the multiple spanning trees must agree as to the VLAN ID of that
VLAN. If they do not agree, then some of the LANs of that VLAN might
not communicate with the rest.
So, if some of the switches belonging to a particular VLAN do not know
MSTP, then all the switches belonging to that VLAN should not use
MSTP.
Bert
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Posted by vicky on June 10, 2008, 3:42 am
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pc1 pc2
| |
| |
| |
--------------------- (designated port)
| layer 2
|-----------------------------------------------------------
| switch (1)
| |
|
| |
---------------------
|
| (designated
port) |
|
|
|
|
| (root
port) X
---------------------
------------------------
| layer 2 |
| layer 2 |
| switch (2)
|-------------------------------------------------| switch
(3) |
| | (designated port)
| |
---------------------
------------------------
|
|
| |
pc1 pc2
(Vlan 1) (vlan 2)
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Posted by vicky on June 7, 2008, 5:07 am
If you were Registered and logged in, you could reply and use other advanced 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 =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
------------------------------------------------------------
Hello,
As some switches support MSTP, Some others support RSTP ,, so is
that
switches are also compatible with those switches , which support only
STP (IEEE 802.1d).
If it is possible then please also tell me ...
Is any bits to be set for providing the compatiblity with those
switches which support MSTP or RSTP , with switch which support only
simple STP.
or it done automatically by switch hardware.
Thanks in advance.
Vikrant
|
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