Tutorial
Introduction to MPlS
and GMPLS
(continued)
4) Path
Management. We
learned in the MPLS signaling
article that MPLS can use RSVP to establish a link from
end-to-end. However, if MPLS data traverses telecom networks,
other protocols must be implemented, such as UNI, PNNI, or
SS7. Path
management can be a challenge because several standards
organizations are involved. Currently, the IETF is working on
modifications to RSVP and LDP (Label Distribution Protocol) to
extend the protocol to allow for GMPLS path management and
control (Figure 11).
Figure 11
5)
Link Management. In MPLS,
the LSP (Label Switch Path) was used to establish and tear
down links and aggregate links. In GMPLS, the ability to
establish and aggregate optical channels is required. LMP
(Link Management Protocol) extends the MPLS functions into an
optical plane where link building improves scalability (Figure
12).
Figure 12
6)
Protection and Recovery. Intelligent
optical networking allows inflexible optical networks to
interact with each other. With GMPLS, instead of having one
ring with a backup ring for protection, the network creates a
true mesh that allows for several different paths (Figure 13).
Optical networking can go from a one-to-one protection method
to a one-to-many protecting method.
Figure 13
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