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Routing & Switching · Advanced

Pseudowire (PW)

An emulated point-to-point Layer 2 circuit across an MPLS or IP network, carrying Ethernet, Frame Relay or ATM frames.

Definition

Pseudowires use a two-label stack: a transport label and a PW (VC) label signalled by targeted LDP (RFC 8077) or BGP. Cisco calls the feature AToM (Any Transport over MPLS).

Example

xconnect 10.255.0.4 100 encapsulation mpls

Exam tip

The VC ID must match on both PEs for an LDP-signalled pseudowire.

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