Query related to a stp and vlan case
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Posted by vicky on June 26, 2008, 1:53 pm
Please log in for more thread options please go to that link below to see my query stored in a file which is accessable as my query need some graphics along with it http://vikrantpandey.diinoweb.com/files/ and please answer me Thanks in advance Vikrant | |||||||||||||||||||||||||||||||
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Posted by Albert Manfredi on June 26, 2008, 4:26 pm
Please log in for more thread options Essentially NOTHING will work in this network, as far as I can tell. It doesn't matter whether the VLANs are statically configured by switch port, or whether all of the ports are 802.1Q VLAN-aware. You have no trunk links between the three switches, and none of these switches is configured as a router, so it looks to me like nothing will communicate. Think about what a switch would do with a frame arriving at one port, configured to only accept VLAN X frames, when none of its other ports are members of that VLAN X. The frame will get dropped on the floor. The link between switch 1 and switch 2, and between switch 2 and switch 3 (or switch 1 and switch 3), have to be configured as trunks. Then you can at least get frames between all the switches. If these segments are configured as trunks, and without any router function in the net, the three PCs off switch 2 will still NOT be able to communicate among each other, because they each belong to different VLANs. If you make even those PC links trunk segments, and the PCs themselves VLAN-aware, then you can allow each PC to intercommunicate at Layer 2 by becoming member of the same VLAN as the other PCs, or you can add an IP layer and configure the PCs as routers. In this last case, each PC could belong to a different VLAN, and still intercommunicate, using IP routing to jump between different VLANs. Bert | |||||||||||||||||||||||||||||||
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Posted by vicky on July 5, 2008, 9:02 am
Please log in for more thread options >
> > Hi, to all
>
> > please go to that link below to see my query stored in a file which is
> > accessable > > as my query need some graphics along with it >
> >http://vikrantpandey.diinoweb.com/files/
>
> Essentially NOTHING will work in this network, as far as I can tell. > > It doesn't matter whether the VLANs are statically configured by > switch port, or whether all of the ports are 802.1Q VLAN-aware. You > have no trunk links between the three switches, and none of these > switches is configured as a router, so it looks to me like nothing > will communicate. > > Think about what a switch would do with a frame arriving at one port, > configured to only accept VLAN X frames, when none of its other ports > are members of that VLAN X. The frame will get dropped on the floor. > > The link between switch 1 and switch 2, and between switch 2 and > switch 3 (or switch 1 and switch 3), have to be configured as trunks. > Then you can at least get frames between all the switches. > > If these segments are configured as trunks, and without any router > function in the net, the three PCs off switch 2 will still NOT be able > to communicate among each other, because they each belong to different > VLANs. > > If you make even those PC links trunk segments, and the PCs themselves > VLAN-aware, then you can allow each PC to intercommunicate at Layer 2 > by becoming member of the same VLAN as the other PCs, or you can add > an IP layer and configure the PCs as routers. In this last case, each > PC could belong to a different VLAN, and still intercommunicate, using > IP routing to jump between different VLANs. > > Bert ------------------------------------------------------------- Hello What u say about inter-vlan communication is it possible ..... if yes plz tell how ???? Thanks Vikrant | |||||||||||||||||||||||||||||||
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Posted by Rich Seifert on July 5, 2008, 12:10 pm
Please log in for more thread options In article
>
> What u say about inter-vlan communication is it possible ..... if > yes plz tell how ???? > A VLAN is a *virtual LAN*, i.e., distinct VLANs appear to be physically separate Local Area Networks. As with all separate networks, communication among them can be effected by using a router. -- 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 Robert Redelmeier on July 5, 2008, 1:49 pm
Please log in for more thread options >> What u say about inter-vlan communication is it possible
>> ..... if yes plz tell how ???? > A VLAN is a *virtual LAN*, i.e., distinct VLANs appear to be
> physically separate Local Area Networks. As with all separate > networks, communication among them can be effected by using a router. It might help vicky (or not) to hear that inter-VLAN routers usually are purely software based, often with only a single hardware interface (ethercard). VLANs share physical media with other traffic but the packets are at least tagged (often by port number) and usually encrypted to prevent traffic mixing on a logical level. A computer (routers are computers) listens to the traffic from both VLANs (crypto CPU loads can be significant) and decides which packets to translate from one VLAN onto another. -- Robert | |||||||||||||||||||||||||||||||
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>
> please go to that link below to see my query stored in a file which is
> accessable
> as my query need some graphics along with it
>
> http://vikrantpandey.diinoweb.com/files/