Segment Routing (SR-MPLS): Replacing LDP and RSVP-TE
SR-MPLS keeps the MPLS data plane and drops LDP and RSVP-TE. Prefix-SIDs, adjacency-SIDs, source-routed label stacks, SR-MPLS vs SRv6, and why networks migrate.
MPLS
Multiprotocol Label Switching, the forwarding paradigm that powers most service provider backbones and large enterprise WANs. Articles tagged MPLS cover labels and the label stack, LDP, L3VPN with MP-BGP and VPNv4, traffic engineering, and segment routing.
Latest posts — page 2
QoS for VoIP Across an MPLS WAN
End-to-end QoS for VoIP across an MPLS L3VPN: DSCP marking, the LLQ + CBWFQ policy at the CE edge, and the DSCP-to-MPLS-EXP mapping the carrier needs.
MPLS L3VPN vs SD-WAN: When to Migrate
A decision framework for migrating from MPLS L3VPN to SD-WAN: what's different, when to migrate, the 7-step transition that works, and when the right answer is to stay.
Cisco MPLS Configuration on IOS XE
Cisco MPLS configuration on IOS XE: enabling MPLS forwarding, LDP, LDP-IGP sync, VRFs for L3VPN, and MP-BGP between PEs. With a complete PE config example.
MPLS L3VPN with MP-BGP and VPNv4
MPLS L3VPN architecture: VRFs, Route Distinguishers, Route Targets, MP-BGP for VPNv4, the two-label stack, PE-CE routing, and the Cisco IOS XE configuration.
LDP and MPLS Label Distribution
LDP (Label Distribution Protocol) distributes MPLS labels across the network. Discovery, session establishment, distribution and retention modes, LDP-IGP sync, and Cisco IOS XE configuration.
MPLS Labels Explained: Format, Stacking, and Penultimate Hop Popping
MPLS labels byte-by-byte: 20-bit label, EXP/TC, S bit, TTL. The label stack model, reserved labels, Penultimate Hop Popping, TTL handling, and what labels look like in Wireshark.
SD-WAN vs MPLS: When Each Wins in 2026
SD-WAN and MPLS are not pure substitutes. The technical differences, cost story without the marketing spin, when MPLS still wins, and the hybrid pattern most enterprises end up with.
MP-BGP: Multiprotocol BGP Address Families Explained
MP-BGP (RFC 4760) is what lets a single BGP session carry IPv6, VPNv4, EVPN, and more. The AFI/SAFI model, route distinguishers, and how modern data center fabrics use MP-BGP for everything.