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IPv6 ND inspection learns and secures bindings for stateless autoconfiguration addresses in Layer 2 neighbor tables. IPv6 ND inspection analyzes ND messages in order to build a trusted binding table. IPv6 ND messages that do not have valid bindings are dropped.
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
IPv6 global policies provide storage and access policy database services. IPv6 ND inspection and IPv6 RA guard are IPv6 global policies features. Every time an ND inspection or RA guard is configured globally, the policy attributes are stored in the software policy database. The policy is then applied to an interface, and the software policy database entry is updated to include this interface to which the policy is applied.
IPv6 ND inspection learns and secures bindings for stateless autoconfiguration addresses in Layer 2 neighbor tables. IPv6 ND inspection analyzes neighbor discovery messages in order to build a trusted binding table database, and IPv6 neighbor discovery messages that do not have valid bindings are dropped. A neighbor discovery message is considered trustworthy if its IPv6-to-MAC mapping is verifiable.
This feature mitigates some of the inherent vulnerabilities for the neighbor discovery mechanism, such as attacks on duplicate address detection (DAD), address resolution, device discovery, and the neighbor cache.
This example provides information about an interface on which both the Neighbor Discovery Inspection and RA Guard features are configured:
Device# show ipv6 snooping capture-policy interface ethernet 0/0
Hardware policy registered on Ethernet 0/0
Protocol Protocol value Message Value Action Feature
ICMP 58 RS 85 punt RA Guard
punt ND Inspection
ICMP 58 RA 86 drop RA guard
punt ND Inspection
ICMP 58 NS 87 punt ND Inspection
ICM 58 NA 88 punt ND Inspection
ICMP 58 REDIR 89 drop RA Guard
punt ND Inspection
Related Topic | Document Title |
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IPv6 addressing and connectivity |
IPv6 Configuration Guide |
Cisco IOS commands |
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IPv6 commands |
Cisco IOS IPv6 Command Reference |
Cisco IOS IPv6 features |
Cisco IOS IPv6 Feature Mapping |
Description | Link |
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 | Feature Information for IPv6 Neighbor Discovery Inspection |
Feature Name | Releases | Feature Information |
---|---|---|
IPv6 Neighbor Discovery Inspection |
12.2(50)SY 15.0(1)SY 15.0(2)SE 15.1(2)SG |
IPv6 neighbor discovery inspection learns and secures bindings for stateless autoconfiguration addresses in Layer 2 neighbor tables. The following commands were introduced or modified: debug ipv6 snooping, device-role, drop-unsecure, ipv6 nd inspection, ipv6 nd inspection policy, sec-level minimum, show ipv6 snooping capture-policy, show ipv6 snooping counter, show ipv6 snooping features, show ipv6 snooping policies, tracking, trusted-port. |
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.