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The IPv6 RA Guard feature provides support for allowing the network administrator to block or reject unwanted or rogue router advertisement (RA) guard messages that arrive at the network device platform.
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.
The IPv6 RA Guard feature provides support for allowing the network administrator to block or reject unwanted or rogue RA guard messages that arrive at the network device platform. RAs are used by devices to announce themselves on the link. The IPv6 RA Guard feature analyzes these RAs and filters out RAs that are sent by unauthorized devices. In host mode, all RA and router redirect messages are disallowed on the port. The RA guard feature compares configuration information on the Layer 2 (L2) device with the information found in the received RA frame. Once the L2 device has validated the content of the RA frame and router redirect frame against the configuration, it forwards the RA to its unicast or multicast destination. If the RA frame content is not validated, the RA is dropped.
Device(config)# interface fastethernet 3/13
Device(config-if)# ipv6 nd raguard attach-policy
Device# show running-config interface fastethernet 3/13
Building configuration...
Current configuration : 129 bytes
!
interface FastEthernet3/13
switchport
switchport access vlan 222
switchport mode access
access-group mode prefer port
ipv6 nd raguard
end
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 |
|
IPv6 commands |
Cisco IOS IPv6 Command Reference |
Cisco IOS IPv6 features |
Cisco IOS IPv6 Feature Mapping |
Standard/RFC | Title |
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RFCs for IPv6 |
IPv6 RFCs |
MIB |
MIBs Link |
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No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. |
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
Description | Link |
---|---|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
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 RA Guard |
Feature Name | Releases | Feature Information |
---|---|---|
IPv6 RA Guard |
12.2(33)SXI4 12.2(50)SY 12.2(54)SG 15.0(2)SE 15.0(2)SG 15.2(4)S 15.2(4)M Cisco IOS XE Release 3.8S Cisco IOS XE Release 3.2SE Cisco IOS XE Release 3.2SG |
The IPv6 RA Guard feature provides support for allowing the network administrator to block or reject unwanted or rogue RA guard messages that arrive at the network device platform. The following commands were introduced or modified: debug ipv6 snooping raguard, device-role, hop-limit, ipv6 nd raguard attach-policy, ipv6 nd raguard policy, managed-config-flag, match ipv6 access-list, match ra prefix-list, other-config-flag, router-preference maximum, show ipv6 nd raguard policy. |
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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.