Cisco 500 Series Administration Manual page 517

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Security: IPv6 First Hop Security
IPv6 First Hop Security Overview
IPv6 First Hop Security Perimeter
IPv6 First Hop Security switches can form a perimeter separating untrusted area
from trusted area. All switches inside the perimeter support IPv6 First Hop
Security, and hosts and routers inside this perimeter are trusted devices. For
example, in Figure 9 Switch B and Switch C are inner links inside the protected
area.
Figure 9 IPv6 First Hop Security Perimeter
515 Cisco 500 Series Stackable Managed Switch Administration Guide