MPLS (Multiprotocol Label Switching)

Multiprotocol Label Switching (RFC 3031) forwards packets based on short fixed-length labels assigned at network ingress, abstracting the underlying transport. It is widely used in operator backbones and enterprise WANs to deliver traffic engineering, deterministic paths, and service constructs such as MPLS L3VPN and Pseudowire. MPLS itself does not encrypt traffic; sensitive flows still need IPsec or MACsec on top.

Categories: Radio Access NetworkSecurity ControlsProtocols and Standards

MPLS in context

The radio access network is the layer where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations, downgrade attacks and jamming, and defenses hinge on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Security controls in telecom span signaling firewalls (SS7/Diameter/GTP screening at the network edge), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both the packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36 and, in Europe, NIS2 sectoral rules.

To place MPLS in the wider telecom-security picture, review SRv6, 6G, DOCSIS, HTTP, SMPP and SSH.

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