Understanding BGP Link State (BGP-LS)
????What is BGP-LS?
BGP-LS (BGP Link-State)is anextension of BGPthat allows routers to exchangenetwork topology informationviaLink-State NLRI.
HelpsSDN controllers and path computation elements (PCEs)makeintelligent routing decisions.
????What Does BGP-LS Advertise?
✅Node Information– Router IDs, Loopbacks
✅Link Information– Bandwidth, Delay, Cost
✅Prefix Information– Network Subnets
✅Topology Information– Full network graph
Why is the Answer TRUE?
✅BGP-LS introduces a new NLRI formatfor advertising link-state information.
✅NLRI (Network Layer Reachability Information) is used to distribute topology datato SDN controllers.
✅It improves path optimization by enabling centralized traffic engineering decisions.
Real-World Application:
SDN-Based Traffic Engineering:Used inSegment Routing (SR)networks for centralizedpath selection.
MPLS TE (Traffic Engineering):Optimizes network paths dynamically based onreal-time link-state data.
✅Reference:Huawei HCIE-Datacom Guide – BGP Link-State (BGP-LS) Fundamentals
