400-007: Cisco Certified Design ExpertDemo

A ring has limited redundant connectivity and potentially long alternate paths. Following a topology change, link-state updates and SPF recalculations can need to progress around multiple routers before a consistent alternate route is installed. More richly connected mesh or triangulated topologies provide shorter, more direct redundant paths. Cisco documentation identifies ring-based topologies as cases that require additional fast-reroute protection beyond basic LFA, reflecting their less favorable failure-recovery characteristics.