PCE WG rechater discussion
Young Lee <ylee <at> huawei.com>
2008-03-11 15:46:43 GMT
Enhancing PCE interoperability and Scalability for WSON
and beyond
Hi PCE'rs, at the upcomming meeting in Philadelphia we
noticed some time for PCE
charter discussion. One area that has come up in
the application of PCE to
wavelength switched optical networks (WSON) is the
additional amount of
information needed to specify the constraints on the
path. In addition, there
has been concerns about the scalability of
distributing this information and
precise link lambda utilization information
via an IGP.
In section 6.7 of RFC4655 (PCE Architecture) on PCE TED
synchronization a
description of "Out-of-band TED synchronization" (non-IGP
based) is given and
some considerations of mechanisms are discussed. For the
WSON case we have
discussed in our various drafts such a mechanism could
prove very beneficial.
We think that the PCE charter should be extended to
include a mechanism for out
of band TED distribution and synchronization.
This communication of TED
information can be partial or complete and could
flow from network elements,
management systems, and PCEs to other
PCEs.
The use of management protocols for "Out-of-band TED
synchronization" present a
number of difficulties. First, the information
models are by necessity much
larger and complex than required for constrained
path computation since those
models are used to support general network
management (Fault, Configuration,
Accounting, Performance). Second, as seen
in the WSON case, efficient transport
of incremental updates of resource
state is key to scalability in a dynamic
networking environment. While IGPs
have generally been strong in this area the
requirement of flooding the
dynamic resource status information among all
network elements leads to
scalability concerns. We envision that such a
capability could be acheived
via an extendable path computation information
model roughly based on todays
GMPLS routing models combined with a protocol
suitable for NE/NMS to PCE
communications such as PCEP.
Regards
Greg B. and Young L.
<div>
<div>Enhancing PCE interoperability and Scalability for WSON
and beyond</div>
<div> </div>
<div>Hi PCE'rs, at the upcomming meeting in Philadelphia we
noticed some time for PCE<br>charter discussion. One area that has come up in
the application of PCE to<br>wavelength switched optical networks (WSON) is the
additional amount of<br>information needed to specify the constraints on the
path. In addition, there<br>has been concerns about the scalability of
distributing this information and<br>precise link lambda utilization information
via an IGP.</div>
<div> </div>
<div>In section 6.7 of RFC4655 (PCE Architecture) on PCE TED
synchronization a<br>description of "Out-of-band TED synchronization" (non-IGP
based) is given and <br>some considerations of mechanisms are discussed. For the
WSON case we have<br>discussed in our various drafts such a mechanism could
prove very beneficial.</div>
<div> </div>
<div>We think that the PCE charter should be extended to
include a mechanism for out<br>of band TED distribution and synchronization.
This communication of TED<br>information can be partial or complete and could
flow from network elements,<br>management systems, and PCEs to other
PCEs.</div>
<div> </div>
<div>The use of management protocols for "Out-of-band TED
synchronization" present a <br>number of difficulties. First, the information
models are by necessity much<br>larger and complex than required for constrained
path computation since those<br>models are used to support general network
management (Fault, Configuration,<br>Accounting, Performance). Second, as seen
in the WSON case, efficient transport<br>of incremental updates of resource
state is key to scalability in a dynamic<br>networking environment. While IGPs
have generally been strong in this area the<br>requirement of flooding the
dynamic resource status information among all<br>network elements leads to
scalability concerns. We envision that such a<br>capability could be acheived
via an extendable path computation information<br>model roughly based on todays
GMPLS routing models combined with a protocol<br>suitable for NE/NMS to PCE
communications such as PCEP.</div>
<div> </div>
<div>Regards</div>
<div> </div>
<div>Greg B. and Young L. </div>
</div>
RSS Feed