Users Guide

○ 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.
• To configure an IPsec security policy for authenticating or encrypting OSPFv3 packets on a physical, port-channel, or VLAN interface
or OSPFv3 area, perform any of the following tasks:
○ Configuring IPsec Authentication on an Interface
○ Configuring IPsec Encryption on an Interface
○ Configuring IPsec Authentication for an OSPFv3 Area
○ Configuring IPsec Encryption for an OSPFv3 Area
○ Displaying OSPFv3 IPsec Security Policies
Configuring IPsec Authentication on an Interface
To configure, remove, or display IPsec authentication on an interface, use the following commands.
Prerequisite: Before you enable IPsec authentication on an OSPFv3 interface, first enable IPv6 unicast routing globally, configure an IPv6
address and enable OSPFv3 on the interface, and assign it to an area (refer to Configuration Task List for OSPFv3 (OSPF for IPv6)).
The SPI value must be unique to one IPsec security policy (authentication or encryption) on the router. Configure the same authentication
policy (the same SPI and key) on each OSPFv3 interface in a link.
• Enable IPsec authentication for OSPFv3 packets on an IPv6-based interface.
INTERFACE mode
ipv6 ospf authentication {null | ipsec spi number {MD5 | SHA1} [key-encryption-type] key}
○ null: causes an authentication policy configured for the area to not be inherited on the interface.
○ ipsec spi number: the security policy index (SPI) value. The range is from 256 to 4294967295.
○ MD5 | SHA1: specifies the authentication type: Message Digest 5 (MD5) or Secure Hash Algorithm 1 (SHA-1).
○ key-encryption-type: (optional) specifies if the key is encrypted. The valid values are 0 (key is not encrypted) or 7 (key is
encrypted).
○ key: specifies the text string used in authentication. All neighboring OSPFv3 routers must share key to exchange information. For
MD5 authentication, the key must be 32 hex digits (non-encrypted) or 64 hex digits (encrypted). For SHA-1 authentication, the
key must be 40 hex digits (non-encrypted) or 80 hex digits (encrypted).
• Remove an IPsec authentication policy from an interface.
no ipv6 ospf authentication ipsec spi number
• Remove null authentication on an interface to allow the interface to inherit the authentication policy configured for the OSPFv3 area.
no ipv6 ospf authentication null
• Display the configuration of IPsec authentication policies on the router.
Open Shortest Path First (OSPFv2 and OSPFv3)
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