Cisco Cisco Prime Optical 10.6 Developer's Guide
Cisco Prime Optical 10.6 GateWay/CORBA Programmer Reference Guide
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4.1.7 MPLS and MPLS-TP
Multiprotocol Label Switching (MPLS) allows the forwarding of packets based on labels. In a normal IP
network, the packets are switched based on the destination IP address. In an MPLS network, the packets
are switched based on labels.
In an MPLS network, the labels can be distributed using three different protocols:
network, the packets are switched based on the destination IP address. In an MPLS network, the packets
are switched based on labels.
In an MPLS network, the labels can be distributed using three different protocols:
• Label Distribution Protocol (LDP)
• Resource Reservation Protocol-Traffic Engineering (RSVP-TE)
• Border Gateway Protocol (BGP)
• Resource Reservation Protocol-Traffic Engineering (RSVP-TE)
• Border Gateway Protocol (BGP)
BGP is a routing protocol used in big IP networks where the labeling layer is mostly used to implement
Layer 3 VPNs. After the labels are distributed within a network, the packets are labeled and forwarded
based on labels. The advantages of labeled networks are:
Layer 3 VPNs. After the labels are distributed within a network, the packets are labeled and forwarded
based on labels. The advantages of labeled networks are:
• Protocol agnostic—Can transport any kind of protocol; for example, IP, ATM, Any
Transport over MPLS (AToM).
• High scalability.
• Traffic Engineering—Load balancing and automatic adaption to link changes.
• Traffic Engineering—Load balancing and automatic adaption to link changes.
Multiprotocol Label Switching-Transport Profile (MPLS-TP) is a carrier-grade packet transport
technology that enables the move from SONET and SDH time-division multiplexing (TDM) to packet
switching. MPLS-TP enables MPLS to be deployed in a transport network and to operate similarly to
existing transport technologies. MPLS-TP enables MPLS to support packet transport services with a
degree of predictability that is similar to that of the existing transport networks.
The goal of MPLS-TP is to provide connection-oriented transport for packet and TDM services over
optical networks leveraging the widely deployed MPLS technology. Operations, administration, and
maintenance (OAM) and resiliency features are defined and implemented in MPLS-TP to ensure:
technology that enables the move from SONET and SDH time-division multiplexing (TDM) to packet
switching. MPLS-TP enables MPLS to be deployed in a transport network and to operate similarly to
existing transport technologies. MPLS-TP enables MPLS to support packet transport services with a
degree of predictability that is similar to that of the existing transport networks.
The goal of MPLS-TP is to provide connection-oriented transport for packet and TDM services over
optical networks leveraging the widely deployed MPLS technology. Operations, administration, and
maintenance (OAM) and resiliency features are defined and implemented in MPLS-TP to ensure:
• Scalable operations
• High availability
• Performance monitoring
• Multidomain support
• Carrier-grade packet transport networks
• High availability
• Performance monitoring
• Multidomain support
• Carrier-grade packet transport networks
MPLS-TP can be carried over the existing transport network infrastructure. MPLS-TP defines an MPLS
profile targeted at transport applications and networks. This profile specifies the MPLS characteristics and
extensions required to meet the transport requirements.
PTF_10GE_4, TP_10GE_4, and PTSA_GE equipment is mainly dedicated to forwarding Ethernet frames
from customer networks, thus focusing only on AToM. The method used to transport such a frame is
called pseudowire. Pseudowire is the emulation of a native service over the MPLS network. For
managing PTF_10GE_4, TP_10GE_4, and PTSA_GE equipment, pseudowire and emulated (EVC-based)
service are in a one-to-one relationship. Pseudowire does not provide bundling of additional EVCs. As
shown in Figure 4-3, pseudowires and emulated services are represented by only one service or FDFr.
profile targeted at transport applications and networks. This profile specifies the MPLS characteristics and
extensions required to meet the transport requirements.
PTF_10GE_4, TP_10GE_4, and PTSA_GE equipment is mainly dedicated to forwarding Ethernet frames
from customer networks, thus focusing only on AToM. The method used to transport such a frame is
called pseudowire. Pseudowire is the emulation of a native service over the MPLS network. For
managing PTF_10GE_4, TP_10GE_4, and PTSA_GE equipment, pseudowire and emulated (EVC-based)
service are in a one-to-one relationship. Pseudowire does not provide bundling of additional EVCs. As
shown in Figure 4-3, pseudowires and emulated services are represented by only one service or FDFr.