Reference Guide

The SPI value must be unique to one IPsec security policy (authentication or encryption) on the router. You cannot configure
the same SPI value on another interface even if it uses the same authentication or encryption algorithm.
You cannot use an IPsec authentication type (MD5 or SHA-1) and the null setting at same time on an interface. These
settings are mutually exclusive.
● Enable IPsec authentication for OSPFv3 packets in Interface mode.
ipv6 ospf authentication {null | ipsec spi number {MD5 | SHA1} key}
○ null — Prevent an authentication policy configured for the area to be inherited on the interface. This parameter is only
used if you configure IPsec area authentication.
○ ipsec spi number — Enter a unique security policy index (SPI) value (256 to 4294967295).
○ md5 — Enable message digest 5 (MD5) authentication.
○ sha1 — Enable secure hash algorithm 1 (SHA-1) authentication.
○ key — Enter the text string used in the authentication type. All neighboring OSPFv3 routers must share the key to
exchange information. Only a non-encrypted key is supported. For MD5 authentication, the non-encrypted key must be
32 plain hex digits. For SHA-1 authentication, the non-encrypted key must be 40 hex digits. An encrypted key is not
supported.
To delete an IPsec authentication policy, use the no ipv6 ospf authentication ipsec spi number or no ipv6
ospf authentication null command.
Configure IPsec authentication on interface
OS10(conf-if-eth1/1/1)# ipv6 ospf authentication ipsec spi 400 md5
12345678123456781234567812345678
OS10(conf-if-eth1/1/1)# show configuration
!
interface ethernet1/1/1
ipv6 ospf authentication ipsec spi 400 md5 12345678123456781234567812345678
no switchport
no shutdown
ipv6 address 1::1/64
IPsec encryption on interfaces
Prerequisite: Before you enable IPsec encryption on an OSPFv3 interface, enable IPv6 unicast routing globally, configure an
IPv6 address and enable OSPFv3 on the interface, and assign it to an area.
When you configure encryption on an interface, both IPsec encryption and authentication are enabled. You cannot configure
encryption if you have already configured an interface for IPsec authentication (ipv6 ospf authentication ipsec). To
configure encryption, you must first delete the authentication policy.
● Enable IPsec encryption for OSPFv3 packets in Interface mode.
ipv6 ospf encryption ipsec spi number esp encryption-type
key authentication-type key
○ ipsec spi number — Enter a unique security policy index (SPI) value (256 to 4294967295).
○ esp encryption-type key — Enter the encryption algorithm used with ESP (3DES, DES, AES-CBC, or NULL). For
AES-CBC, only the AES-128 and AES-192 ciphers are supported.
○ key — Enter the text string used in the encryption algorithm. All neighboring OSPFv3 routers must share the key to
decrypt information. Only a non-encrypted key is supported. Required lengths of the non-encrypted key are: 3DES — 48
hex digits; DES — 16 hex digits; AES-CBC — 32 hex digits for AES-128 and 48 hex digits for AES-192.
○ authentication-type key — Enter the encryption authentication algorithm to use (MD5 or SHA1).
○ key — Enter the text string used in the authentication algorithm. All neighboring OSPFv3 routers must share the key
to exchange information. Only a non-encrypted key is supported. For MD5 authentication, the non-encrypted key must
be 32 plain hex digits. For SHA-1 authentication, the non-encrypted key must be 40 hex digits. An encrypted key is not
supported.
To delete an IPsec encryption policy, use the no ipv6 ospf encryption ipsec spi number or no ipv6 ospf
encryption null command.
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Layer 3