Require clarification on IEEE 802.1D -2004 spec on Conformance
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Posted by Kott on December 28, 2005, 12:09 am
Please log in for more thread options Hello - We are implementing IEEE 802.1D -2004,spec on our equipment. I want some clarifications on the specification . As per the PICS conformance in A.9 (Addressing) ADDR-1 it mentions that it is Mandatory for each Port have a Seperate MAC Address (Sec 7.12.2) ? My question :Does this mean that each BPDU frame Txed from a Port be assigned a unique Universally Administered MAC address? Could the experts please throw some light on this ? any clarification on this would be appreciated Thanks and Best Regards Kott | |||||||||||||
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Posted by on December 28, 2005, 2:48 am
Please log in for more thread options Hi, I am not an expert on this in terms of signing off new hardware/software however:- I would say that:- each port must have a unique "Universally Administered MAC address" that is used as the source address for BPDU's transmitted by that port. This is certainly what I have seen when sniffing. It would allow ports to recognise their own BPDUs. | |||||||||||||
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Posted by Kott on January 5, 2006, 5:18 am
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Thanks for the same! I will explain my question with some more information. I have a 16 port switch for which I am implementing IEEE 802.1D -2004 spec. As per the PICS conformance in A.9 (Addressing) ADDR-1 it mentions that it is Mandatory for each Port have a Seperate MAC Address (Sec 7.12.2) ? My question :Does this mean that each BPDU frame Txed from a Port be assigned a unique Universally Administered MAC address? Does the frame in the BPDU data part (Bridge Identifier) need to encode a unique MAC address for each of the Ports on my switch? In the L2 Source Address MAC field I do have a globally unique MAC address for the whole switch Thanks and Best Regards Kott | |||||||||||||
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Posted by Rich Seifert on January 5, 2006, 7:45 am
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That is correct. > My question :Does this mean that each BPDU frame Txed from a Port be
> assigned a unique Universally Administered MAC address? Does the > frame in the BPDU data part (Bridge Identifier) need to encode a unique > MAC address for each of the Ports on my switch? > Again, correct. > In the L2 Source Address MAC field I do have a globally unique MAC
> address for the whole switch > Using one MAC address for all BPDUs emitted from all ports on a single bridge is non-conformant behavior. -- 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 Kott on January 11, 2006, 3:34 am
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Hello - Thanks for the clarification . I just connected a L2 Switch from Extreme and found out that from all the Ports , the BPDU has encoded the Same MAC address.this Encoded MAC address is the same as Source MAC Address in the L2 Fields. thanks and Best Regards Kott Rich Seifert wrote: >
> > Thanks for the same! I will explain my question with some more
> > information. > > I have a 16 port switch for which I am implementing IEEE 802.1D -2004 > > spec. > > > > As per the PICS conformance in A.9 (Addressing) ADDR-1 it mentions that > > it is Mandatory for each Port have a Seperate MAC Address (Sec 7.12.2) > > ? > > >
> That is correct. > > > My question :Does this mean that each BPDU frame Txed from a Port be
> > assigned a unique Universally Administered MAC address? Does the > > frame in the BPDU data part (Bridge Identifier) need to encode a unique > > MAC address for each of the Ports on my switch? > > >
> Again, correct. > > > In the L2 Source Address MAC field I do have a globally unique MAC
> > address for the whole switch > > >
> Using one MAC address for all BPDUs emitted from all ports on a single > bridge is non-conformant behavior. > > > -- > 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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> information.
> I have a 16 port switch for which I am implementing IEEE 802.1D -2004
> spec.
>
> As per the PICS conformance in A.9 (Addressing) ADDR-1 it mentions that
> it is Mandatory for each Port have a Seperate MAC Address (Sec 7.12.2)
> ?
>