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Chapter 12 Monitoring Carrier Ethernet Services Working with Pseudowires
Figure 12-63 Pseudowire Deployment Over Core Network
Figure 12-64 Pseudowire Deployment Over Access Network
A pseudowire headend (PW-HE) virtual interface originates as a PW on an access node an d t ermi nat es
on a Layer 3 service instance on the service provider router. For example, a PWHE can originate on the
Layer 2 PW feeder node and terminate on a VRF instance on the Cisco CRS Router. You can configure
all ingress and egress QoS function on the PW-HE interface, including policing, shaping, queuing, an d
hierarchical policies.
In other words, the PW-HE is a technology that allows termination of access or aggregation pseduowires
into an L2 or L3 domain. It allows us to replace a 2-node solution with a 1-node solution. Without a
PW-HE, a L2 PE node must terminate a PW and then handoff the data to a S-PE via an Access Circuit.
The following figure displays the PW-HE interface:
243510
PW
CE1
PE2
PE2PE1
PE1
CE2
CE1
CE2
320494
CE L2 PE L2 PE S-PE PEP1
Access Network
Global IP/MPLS
Cor Network
PWAC AC
CE-2