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Cisco SR-MPLS or Cisco SRv6 uSID: Choosing the Right Path for Your Network

A deep-dive comparison of Cisco's two Segment Routing implementations — SR-MPLS, built on the proven MPLS data plane, and SRv6 uSID, built natively on IPv6 — where they diverge, where they excel and how to choose the right path forward.

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•Jun 25, 2026

Cisco Segment Routing

Cisco Segment Routing provides complete control over the forwarding paths from the ingress or source network node. Segment Routing is implemented using extensions to the native routing protocols, it does not require any additional protocols and removes unnecessary protocols simplifying the network. Segment routing does not require any path signaling as the per-flow state is maintained at the ingress or source node, removing the state from the network. Segment Routing runs natively on an MPLS or IPv6 data plane and can coexist with your existing LDP network, making for a painless migration. Cisco Segment Routing is supported on the ASR 900, ASR 9000, CRS, NCS 540/560, NCS 5000, NCS 5500, NCS 6000, ASR 1000 and Nexus 9000 product families.

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