Reference Guide

Configuring IPsec Encryption on an Interface
To configure, remove, or display IPsec encryption on an interface, use the following commands.
Prerequisite: Before you enable IPsec encryption 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)).
NOTE: When you configure encryption using the ipv6 ospf encryption ipsec command, you enable
both IPsec encryption and authentication. However, when you enable authentication on an interface using the
ipv6 ospf authentication ipsec command, you do not enable encryption at the same time.
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 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.
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