Cisco Cisco Prime Optical 10.3 Developer's Guide

Cisco Prime Optical 10.3 GateWay/CORBA Programmer Reference Guide 

 

 

442

 

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. 

 

For descriptions of MPLS-TP provisioning and inventory interfaces, see the following sections: 
• 

• 

The MPLS-TP entity is characterized as follows: 
•  Has two endpoints. 
•  Has one or two bidirectional Label Switched Path (LSP) pairs between the endpoints. If there 

are two pairs, then one is the working path and the second is the protected path. 

•  The bidirectional LSPs in a pair are congruent. Bidirectional LSPs follow the same path in 

both directions. 

•  The tunnel can be configured with bandwidth. However, unlike MPLS-TE, there is no 

bandwidth reservation or preemption on the NE. Use the show command to view the 
configured bandwidth. Any bandwidth reservation must be handled within the NMS. 

•  Bidirectional Forwarding Detection (BFD) can be configured to monitor any of the 

bidirectional LSP pairs. 

•  MPLS-TP tunnel is used to carry pseudowires. Pseudowires or PW segments are explicitly 

configured to use a particular MPLS-TP tunnel using a given PW-CLASS configuration. 

Figure 4-4 shows a typical MPLS-TP Tunnel.