Generalized MPLS (GMPLS) extends the benefits of the MPLS control plane to physical
layer connections such as SONET paths and DWDM lightpaths (i.e., wavelengths).
While the GMPLS control plane is functionally similar to the MPLS control plane??”it
uses many of the same routing and label distribution protocols??”the two control planes
work at different network layers and often operate independently. Because an EoS
Figure 11.10 Application of pseudowires and MPLS in EoS networks
MSPP
MSPP
DS-n
DS-n
Ethernet
Ethernet
MSS/SER Ethernet
OC-N
MSS/SER
PE
PE
PE
IP/MPLS network
OC-N ring
Eth. MAC
Eth. PHY
Eth. MAC
PW
MPLS
Eth. MAC
GFP
SONET
Eth. MAC
PW
MPLS
GFP
SONET
or
Eth. MAC
PW
MPLS
Layer 2
Layer 1
Eth. MAC
Eth. PHY
PW
MPLS Tunnel
Only switches
MPLS tunnel
Only switches
MPLS tunnel
MSPP
MSPP
SONET/MSPP 321
network element such as an MSPP can support Ethernet/MPLS/SONET, it is often the
place where the MPLS control plane meets the GMPLS control plane. As the deployment
of control plane functions grows, MSPPs will play an important role in tying
together the MPLS and GMPLS control planes. This will help service providers to see
a more unified view of Layer 1 and Layer 2 connection management and further speed
provisioning times and reduce network operations costs.
Pages:
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748