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Dell Configuration Guide for the S4048–ON System 9.14.2.6

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OSPFv3 Authentication Using IPsec: Configuration Notes

OSPFv3 authentication using IPsec is implemented according to the specifications in RFC 4552.

  • To use IPsec, configure an authentication (using AH) or encryption (using ESP) security policy on an interface or in an OSPFv3 area. Each security policy consists of a security policy index (SPI) and the key used to validate OSPFv3 packets. After IPsec is configured for OSPFv3, IPsec operation is invisible to the user.
    • You can only enable one security protocol (AH or ESP) at a time on an interface or for an area. Enable IPsec AH with the ipv6 ospf authentication command; enable IPsec ESP with the ipv6 ospf encryption command.
    • The security policy configured for an area is inherited by default on all interfaces in the area.
    • The security policy configured on an interface overrides any area-level configured security for the area to which the interface is assigned.
    • The configured authentication or encryption policy is applied to all OSPFv3 packets transmitted on the interface or in the area. The IPsec security associations (SAs) are the same on inbound and outbound traffic on an OSPFv3 interface.
    • There is no maximum AH or ESP header length because the headers have fields with variable lengths.
  • Manual key configuration is supported in an authentication or encryption policy (dynamic key configuration using the internet key exchange [IKE] protocol is not supported).
  • In an OSPFv3 authentication policy:
    • AH is used to authenticate OSPFv3 headers and certain fields in IPv6 headers and extension headers.
    • MD5 and SHA1 authentication types are supported; encrypted and unencrypted keys are supported.
  • In an OSPFv3 encryption policy:
    • Both encryption and authentication are used.
    • IPsec security associations (SAs) are supported only in Transport mode (Tunnel mode is not supported).
    • ESP with null encryption is supported for authenticating only OSPFv3 protocol headers.
    • ESP with non-null encryption is supported for full confidentiality.
    • 3DES, DES, AES-CBC, and NULL encryption algorithms are supported; encrypted and unencrypted keys are supported.
NOTE To encrypt all keys on a router, use the service password-encryption command in Global Configuration mode. However, this command does not provide a high level of network security. To enable key encryption in an IPsec security policy at an interface or area level, specify 7 for [key-encryption-type] when you enter the ipv6 ospf authentication ipsec or ipv6 ospf encryption ipsec command.

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