Security: IPv6 First Hop Security
IPv6 First Hop Security Overview
Cisco 500 Series Stackable Managed Switch Administration Guide 512
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IPv6 First Hop Security Overview
IPv6 FHS is a suite of features designed to secure link operations in an IPv6-
enabled network. It is based on the Neighbor Discovery Protocol and DHCPv6
messages.
In this feature, a Layer 2 switch (as shown in Figure 8) filters Neighbor Discovery
Protocol messages, DHCPv6 messages and user data messages according to a
number of different rules.
Figure 8 IPv6 First Hop Security Configuration
A separate and independent instance of IPv6 First Hop Security runs on each
VLAN on which the feature is enabled.
Abbreviations
Name Description
CPA message Certification Path Advertisement message
CPS message Certification Path Solicitation message
DAD-NS message Duplicate Address Detection Neighbor
Solicitation message
FCFS-SAVI First Come First Served - Source Address
Validation Improvement
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