Tag: IS-IS
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When the Interior Doesn’t Speak PIM: SPBM Multicast Root Cause
SPBM Multicast and a Replacement Plan That Assumed the Wrong Protocol A hospital system spanning several states runs its live IPTV distribution out of a single metro region’s headend: DirecTV and BlonderTongue encoder headends feeding 60+ active multicast streams. When the core node serving that region was rip-and-replaced, removing legacy Avaya-era SPBM hardware out, standing…
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460 Devices, No Documentation, and the Pipeline That Changed That
The engagement had 460 managed devices and no current topology documentation. Network topology automation was the only viable path — manual spreadsheet work would have taken weeks and produced a point-in-time artifact no one could re-run. The Cisco design team needed three structured deliverables before they could move: device inventory, physical topology graph, VLAN/service map.…