• Enable IPsec encryption for OSPFv3 packets on an IPv6-based interface.
INTERFACE mode
ipv6 ospf encryption {null | ipsec spi number esp encryption-algorithm [key-
encryption-type] key authentication-algorithm [key-authentication-type] key}
–null: causes an encryption policy configured for the area to not be inherited on the interface.
–ipsec spi number: is the security policy index (SPI) value. The range is from 256 to
4294967295.
–esp encryption-algorithm: specifies the encryption algorithm used with ESP. The valid values
are 3DES, DES, AES-CBC, and NULL. For AES-CBC, only the AES-128 and AES-192 ciphers are
supported.
–key: specifies the text string used in the encryption. All neighboring OSPFv3 routers must share
the same key to decrypt information. Required lengths of a non-encrypted or encrypted key are:
3DES - 48 or 96 hex digits; DES - 16 or 32 hex digits; AES-CBC - 32 or 64 hex digits for AES-128
and 48 or 96 hex digits for AES-192.
–key-encryption-type: (optional) specifies if the key is encrypted. The valid values are 0 (key is
not encrypted) or 7 (key is encrypted).
–authentication-algorithm: specifies the encryption authentication algorithm to use. The
valid values are MD5 or SHA1.
–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).
–key-authentication-type: (optional) specifies if the authentication key is encrypted. The valid
values are 0 or 7.
• Remove an IPsec encryption policy from an interface.
no ipv6 ospf encryption ipsec spi number
• Remove null encryption on an interface to allow the interface to inherit the encryption policy
configured for the OSPFv3 area.
no ipv6 ospf encryption null
• Display the configuration of IPsec encryption policies on the router.
show crypto ipsec policy
• Display the security associations set up for OSPFv3 interfaces in encryption policies.
show crypto ipsec sa ipv6
Configuring IPSec Authentication for an OSPFv3 Area
To configure, remove, or display IPSec authentication for an OSPFv3 area, use the following commands.
Prerequisite: Before you enable IPsec authentication on an OSPFv3 area, first enable OSPFv3 globally on
the router (refer to Configuration Task List for OSPFv3 (OSPF for IPv6)).
The security policy index (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
interface in an OPSFv3 link.
If you have enabled IPSec encryption in an OSPFv3 area using the area encryption command, you
cannot use the area authentication command in the area at the same time.
The configuration of IPSec authentication on an interface-level takes precedence over an area-level
configuration. If you remove an interface configuration, an area authentication policy that has been
configured is applied to the interface.
Open Shortest Path First (OSPFv2 and OSPFv3) 653