Pseudowire Switching With Protection; Figure 23: Vll Resilience With Pseudowire Redundancy And Switching - Alcatel-Lucent 7750 SR OS Service Manual

Pseudowire Switching with Protection

Figure 23
service across multiple IGP areas in a provider network.
SDP3:300
PW switching
PW switching
SDP1:100
Figure 10: VLL Resilience with Pseudowire Redundancy and Switching
In the network shown in
the ingress PE (7x50 T-PE1), at the egress PE (7x50 T-PE2), and at each pseudowire switching
node (S-PE1 and S-PE2). All VLL service types, such as, Apipe, Epipe, Fpipe, and Ipipe are
supported. The pseudowire switching service at S-PE is supported only between the pseudowire of
the same service type. Note that the user could also configure a VPLS service at the T-PE nodes.
However, the service at the switching nodes is still an Ethernet VLL service in this case.This may
be added in a future release. VC-ID values are significant on a hop-by-hop basis and are unique on
a per T- LDP session only.
The pseudowire switching capability can bind two spoke SDPs of different transport types, such
as, RSVP LSP and LDP LSP. There is no restriction on mixing the SDP types currently supported
7750 SR OS Services Guide
illustrates the use of pseudowire redundancy to provide a scalable and resilient VLL
Access Node
7x50 T-PE2
Metro area B
7x50
7x50 S-PE3
7x50 S-PE1
7x50
Metro area A
7x50 T-PE1
Access Node
Figure 23, the user configures a VLL service, for example, an Epipe, at
7x50 T-PE3
7x50
7x50 S-PE4
Core area
7x50 S-PE2
SDP4:400
7x50
7x50
Virtual Leased Line Services
Primary PW
Standby PW
SDP6:600
PW switching
PW switching
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