802.1D-1998 vs. 802.1D-2004

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I'm reviewing IEEE Std 802.1D-2004 and will have to look at an
implementation of -1998 and consider what's necessary to upgrade it to
the new standard. While I've found a few notes about incompatibilities
and gotchas in -2004, I've not found any comprehensive list of "this is
what changed since 1998" or "These 3 state machines didn't exist in
-1998" or anything. Has anyone published a comparison of the two
standards?

Chris

 

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"Christopher Nelson" <cnelson@nycap.rr.com> wrote:

> I'm reviewing IEEE Std 802.1D-2004 and will have to look at an
> implementation of -1998 and consider what's necessary to upgrade it to
> the new standard. While I've found a few notes about
> incompatibilities
> and gotchas in -2004, I've not found any comprehensive list of "this
> is
> what changed since 1998" or "These 3 state machines didn't exist in
> -1998" or anything. Has anyone published a comparison of the two
> standards?

The most obvious difference, in my view, is that IEEE 802.1D-2004
incorporates IEEE 802.1w, i.e. the Rapid Spanning Tree Protocol. RSTP is
now the default protocol.

Bert

 

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Christopher Nelson wrote:
> I'm reviewing IEEE Std 802.1D-2004 and will have to look at an
> implementation of -1998 and consider what's necessary to upgrade it
to
> the new standard. While I've found a few notes about
incompatibilities
> and gotchas in -2004, I've not found any comprehensive list of "this
is
> what changed since 1998" or "These 3 state machines didn't exist in
> -1998" or anything. Has anyone published a comparison of the two
> standards?

I don't know if such a list exists anywhere. AFAIK, the main
change in the 2004 version was the introduction of Rapid Spanning
Tree Protocol (RSTP). There were probably minor modifications to
other parts such as bug fixes or minor optimizations to GARP/GMRP.

Anoop

 

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anoop wrote:
> Christopher Nelson wrote:
> > I'm reviewing IEEE Std 802.1D-2004 and will have to look at
> > an implementation of -1998 and consider what's necessary to
> > upgrade it to the new standard. While I've found a few
> > notes about incompatibilities and gotchas in -2004, I've not
> > found any comprehensive list of "this is what changed since
> > 1998" or "These 3 state machines didn't exist in -1998" or
> > anything. Has anyone published a comparison of the two
> > standards?
>
> I don't know if such a list exists anywhere. AFAIK, the main
> change in the 2004 version was the introduction of Rapid Spanning
> Tree Protocol (RSTP). There were probably minor modifications to
> other parts such as bug fixes or minor optimizations to GARP/GMRP.

Hmmm. My question was imprecise. I know that a major difference
between 1D-1998 and 1D-2004 is adding RSTP but even then the RSTP of
802.1w-2001 is different from the RSTP of 802.1D-2004 and that's really
the focus of my work. Fortunately, I've found that comparing the state
diagrams in section 17 (of .1w and .1D) shows the differences pretty
clearly. An introduction describing the diferences would be nice but
isn't as important as I thought it would be.

 

[Alcatel-SRA]

I am working on a comparison slide deck at the moment, unfortunately you'd have to sign up for the Alcatel-Lucent SRC VPLSv2 course available August 2009. http://www.alcatel-lucent.com/src

The major differences have to do with convergence mostly. This is helped by the definition of the FLAG fields in the BPDU. Ports advertise their state and role when sending BPDUs in 2004 whereas in 1998, there is only topology change flags set.

There is also a proposal and agreement process instead of listening (15s) and learning (15s) which is MUCH quicker than before. This process doesn't soley rely on fixed timers.

Hope that helps you out as STP is an under documented topic.

Hope to see you on an SRC program in the future.