Senthil,
-> > There is no difference between MPLS-TE and
-> DiffServ-aware-MPLS-> TE? In other
-> > words, are you saying that Differv-aware-MPLS-TE
-> > is notgoing solve ANY problem that MPLS-TE alone couldn't
-> > solve ?
-> I was just talking about diffserv aware MPLS TE which is
-> more related to
-> the context of discussion. The authors of diffserv MPLS TE
-> draft discusses scalability problems.
Yes! I am also talking about DiffServ-aware-MPLS-TE.
In the draft-ietf-tewg-diff-te-reqts-05.txt authors
clearly mentioned about problem statement and how we
can benefit from DiffServ-aware-MPLS-TE (even if there
are some scalability issues). Effectively, authors
are trying to solve SOME problem - then how can
you can say that DiffServ-aware-MPLS-TE (aka DiffRouting)
is not going to solve ANY problem.
Scalability issues in TOS Routing are different
from scalability issues in DiffRouting (if you consider
TOS routing is applicable in traditional hop-by-hop
routing case and DiffRouting is applicable in todays
source routing cases).
Finally, let me conclude what I agree and disagree
with you.
What I agree:
- None of these approaches [traditional TOS-Routing or
DiffRouting (DiffServ-aware-MPLS-TE)] really solve
end-to-end QoS/Performance. I already expressed this
concern to Fred Baker (which he concluded that as
an open ended question) - which is fine!
http://www1.ietf.org/mail-archive/working-groups/routing-discussion/current/
msg00060.html
- None of the above approaches are complete. They have
some common and some different issues - for example
scalability etc etc
What I don't agree (my view):
- Just because a solution has scalability issues doesn't
mean that that solution is not going to solve ANY
problem.
- Diffserv-aware-MPLS-TE is trying to solve different problems
which we couldn't solve with traditional routing approaches
*easily* in the past.
- We are trying to solve (we will solve) those scalability
issues in source routing (using hierarchical TE etc etc)
in future.
Do you agree? If not let me know - let us discuss :)
If you still feel that DiffRouting is not going to solve
ANY problem then I will ask authors of
draft-ietf-tewg-diff-te-reqts-05.txt (for clarification).
Finally, you didn't tell me in what other approaches
we can solve the same issues that the DiffServ-TE is
trying to solve (with out letting control plane know,
with out CSPF, with out connection-oriented MPLS etc etc).
-- Venkata
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