Hi Acee,
some clarification is required in terms of EL-bit setting in various
compatibility cases. I assume EL-bit is set only in "Normal" mode.
Regarding the AreaExtendedLSASupport, you defined only two modes for it,
MixedMode is missing, not sure why. Also, if we keep both global and per
area compatibility support, some intersection analysis between the two
is required - e.g. do we support 'MixedMode' at global level with
'Normal' at area level - these two contradict each other in terms of
adjacency formation with legacy routers.
I'm afraid that keeping the compatibility support at two different
levels is going to create a lot of confusion.
thanks,
Peter
On 12/28/13 23:37 , Acee Lindem wrote:
Given that the authors really don't want to leave a legacy of complexity
with the backward compatibility cases. I think we are going to reduce
the compatibility cases to:
ExtendedLSASupport
This is an enumeration type indicating the extent to which the
OSPFv3 instance supports the TLV format described herein for
Extended LSAs. The valid value for the enumeration are:
* None - Non-extended LSAs will not be originated or used in the
SPF calculation.
* Normal - Extended LSAs will be originated and adjacencies will
not be formed with OSPFv3 routers not supporting this
specification.
* MixedMode - Both extended and non-extended LSAs will be
originated. OSPFv3 adjacencies will be formed with OSPFv3
routers not supporting this specification. The non-extended
LSAs are used for the SPF computation.
One thing that occurred to me is that it might be useful to migrate a single
area. In this case, one would allow the following modes:
AreaExtendedLSASupport
This is an enumeration type indicating the extent to which the
OSPFv3 area supports the TLV format described herein for
Extended LSAs. The valid value for the enumeration are:
* None - Non-extended LSAs will not be originated or used in the
SPF calculation.
* Normal – Area and link-local scoped Extended LSAs will be originated
and adjacencies will not be formed with OSPFv3 routers in the area not
supporting this Extended LSAs. AS scoped LSAs will be originated as
non-extended LSAs.
Thoughts?
Thanks,
Acee
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