OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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OSPFv3 IPsec authentication and encryption

Unlike OSPFv2, OSPFv3 does not have authentication fields in its protocol header to provide security. To provide authentication and confidentiality, OSPFv3 uses IP Security (IPsec) — a collection of security protocols for authenticating and encrypting data packets. OS10 OSPFv3 supports IPsec using the IPv6 authentication header (AH) or IPv6 encapsulating security payload (ESP).
  • AH authentication verifies that data is not altered during transmission and ensures that users are communicating with the intended individual or organization. The authentication header is inserted after the IP header with a value of 51. MD5 and SHA1 authentication types are supported; encrypted and unencrypted keys are supported.
  • ESP encryption encapsulates data, enabling the protection of data that follows in the datagram. The ESP extension header is inserted after the IP header and before the next layer protocol header. 3DES, DES, AES-CBC, and NULL encryption algorithms are supported; encrypted and unencrypted keys are supported.

Apply IPsec authentication or encryption on a physical, port-channel, or VLAN interface or in an OSPFv3 area. Each configuration consists of a security policy index (SPI) and the key used to validate OSPFv3 packets. After you configure an IPsec protocol for OSPFv3, IPsec operation is invisible to the user.

You can only enable one security protocol (authentication or encryption) 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.
  • A security policy configured for an area is inherited by default on all interfaces in the area.
  • A 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 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.

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