Administrator Guide

NOTE: When you congure 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. Congure 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 congured 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: species 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: species 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) species if the key is encrypted. The valid values are 0 (key is not encrypted) or 7 (key is
encrypted).
• authentication-algorithm: species the encryption authentication algorithm to use. The valid values are MD5 or SHA1.
• key: species 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) species 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 congured for the OSPFv3 area.
no ipv6 ospf encryption null
• Display the conguration 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
Conguring IPSec Authentication for an OSPFv3 Area
To congure, remove, or display IPSec authentication for an OSPFv3 area, use the following commands.
Prerequisite: Before you enable IPsec authentication on an OSPFv3 area, rst enable OSPFv3 globally on the router (refer to Conguration
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. Congure
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 conguration of IPSec authentication on an interface-level takes precedence over an area-level conguration. If you remove an
interface conguration, an area authentication policy that has been congured is applied to the interface.
• Enable IPSec authentication for OSPFv3 packets in an area.
CONF-IPV6-ROUTER-OSPF mode
area-id authentication ipsec spi number {MD5 | SHA1} [key-encryption-type] key
Open Shortest Path First (OSPFv2 and OSPFv3)
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