Concept Guide

The configuration of IPsec encryption on an interface-level takes precedence over an area-level configuration. If you remove an
interface configuration, an area encryption policy that has been configured is applied to the interface.
● Enable IPsec encryption for OSPFv3 packets in an area.
CONF-IPV6-ROUTER-OSPF mode
area area-id encryption ipsec spi number esp encryption-algorithm [key-encryption-type]
key authentication-algorithm [key-authentication-type] key
○ area area-id: specifies the area for which OSPFv3 traffic is to be encrypted. For area-id, enter a number or an
IPv6 prefix.
○ 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. The 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. Valid values: 0 (key is not encrypted) or 7 (key is
encrypted).
○ authentication-algorithm: specifies the authentication algorithm to use for encryption. 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 OSPFv3 area.
no area area-id encryption ipsec spi number
● Display the configuration of IPsec encryption policies on the router.
show crypto ipsec policy
Displaying OSPFv3 IPsec Security Policies
To display the configuration of IPsec authentication and encryption policies, use the following commands.
● Display the AH and ESP parameters configured in IPsec security policies, including the SPI number, key, and algorithms used.
EXEC Privilege mode
show crypto ipsec policy [name name]
○ name: displays configuration details about a specified policy.
● Display security associations set up for OSPFv3 links in IPsec authentication and encryption policies on the router.
EXEC Privilege
show crypto ipsec sa ipv6 [interface interface]
To display information on the SAs used on a specific interface, enter interface interface, where interface is one of
the following values:
○ For a 10-Gigabit Ethernet interface, enter the keyword TenGigabitEthernet then the slot/port[/subport]
information.
○ For a 40-Gigabit Ethernet interface, enter the keyword fortyGigE then the slot/port information.
○ For a port channel interface, enter the keywords port-channel then a number.
○ For a VLAN interface, enter the keyword vlan then a number from 1 to 4094.
In the first example, the keys are not encrypted (shown in bold). In the second and third examples, the keys are encrypted
(shown in bold).
The following example shows the show crypto ipsec policy command.
DellEMC#show crypto ipsec policy
Crypto IPSec client security policy data
Policy name : OSPFv3-1-502
Policy refcount : 1
670
Open Shortest Path First (OSPFv2 and OSPFv3)