Re: draft-bonica-tunneltrace-02

[Eric Rosen <erosen@cisco.com>]

SHahram>  2)  Add  backward  compatibility, simplicity  and  scalability  as
SHahram>    requirements.  

I  don't agree  that  "backward compatibility"  is  a requirement.   There's
nothing inherently wrong  with a tool that requires  support in the backbone
for it to achieve its full effect. 

The problem with "simplicity" as a  requirement is that it is not objective.
I've never seen  a dispute in which the proponents  of a particular proposal
didn't  claim that  their proposal  is simple  and all  other  proposals are
nightmarishly complicated. 

Scalability  is  also  useless  as  a  requirement  unless  we  specify  the
particular  set of  dimensions  that we  think  should be  able to  increase
without impacting  the usefulness of  the scheme.  Different opinions  as to
what these  dimensions are  often lead to  endless disputes about  whether a
particular scheme is scalable or not.