Seit AOS Release 8.7 ist es möglich OSPF über die Security Key-Chain zu authentifizieren:

sw7 (6860-A) -> security key 123 algorithm
aes-cmac-128  aes-gcm-256   sha224        sha512
aes-cmac-256  md5           sha256        simple
aes-gcm-128   sha1          sha384

Dabei stehen nicht alle Verfahren für alle Protokolle/Anwendungen zur Verfügung. Die Verfahren aes-gcm-128 und aes-gcm-256 werden hier rein für MACsec verwendet (je nach Hardwareplattform).

sw7 (6860-A) -> show ip ospf interface vlan-20
Interface IP Name                     = vlan-20,
Interface IP Address                  = 192.168.20.7,
Interface IP Mask                     = 255.255.255.0,
Domain Name                           = Vlan,
Domain ID                             = 20,
Admin Status                          = Enabled,
Operational Status                    = Up,
OSPF Interface State                  = DR,
Interface Type                        = Broadcast,
Area Id                               = 0.0.0.0,
Designated Router IP Address          = 192.168.20.7,
Designated Router RouterId            = 192.168.20.7,
Backup Designated Router IP Address   = 192.168.20.8,
Backup Designated Router RouterId     = 192.168.20.8,
MTU  (bytes)                          = 1500,
Metric Cost                           = 1,
Priority                              = 1,
Hello Interval (seconds)              = 10,
Transit Delay (seconds)               = 1,
Retrans Interval (seconds)            = 5,
Dead Interval (seconds)               = 40,
Poll Interval (seconds)               = 120,
Link Type                             = Broadcast,
Authentication Type                   = keychain(1),
# of Events                           = 2,
# of Init State Neighbors             = 0,
# of 2-Way State Neighbors            = 0,
# of Exchange State Neighbors         = 0,
# of Full State Neighbors             = 1,
# of type-9 LSAs on this interface    = 0,
BFD status                            = Disabled,
DR-Only Option for BFD                = Disabled

sw7 (6860-A) -> show configuration snapshot ip ospf security
! IP:
ip interface "vlan-20" address 192.168.20.7 mask 255.255.255.0 vlan 20 ifindex 1

! OSPF:
ip load ospf
ip ospf area 0.0.0.0
ip ospf interface "vlan-20"
ip ospf interface "vlan-20" area 0.0.0.0
ip ospf interface "vlan-20" auth-type key-chain 1
ip ospf interface "vlan-20" admin-state enable
ip ospf admin-state enable

! Security:
# Folgendes ist die Eingabe via CLI:
security key 123 algorithm sha256 key ALESecret2023abcd start-time 02/08/2023 00:00
# In der vcboot.cfg Konfiguration steht dann allerdings folgendes:
#security key 123 algorithm sha256 encrypt-key 6c79d5a17a685ee2deb06299 start-time 02/07/2023 00:00
security key-chain 1 name "OSPF"
security key-chain 1 key 123

sw8 (6860-B) -> show configuration snapshot ip ospf security
! IP:
ip interface "vlan-20" address 192.168.20.8 mask 255.255.255.0 vlan 20 ifindex 1

! OSPF:
ip load ospf
ip ospf area 0.0.0.0
ip ospf interface "vlan-20"
ip ospf interface "vlan-20" area 0.0.0.0
ip ospf interface "vlan-20" auth-type key-chain 1
ip ospf interface "vlan-20" admin-state enable
ip ospf admin-state enable

! Security:
security key 123 algorithm sha256 encrypt-key 6c79d5a17a685ee2deb06299 start-time 02/06/2023 00:00
security key-chain 1 name "OSPF"
security key-chain 1 key 123

In meinem Beispiel habe ich auf dem verwendeten Switch das falsche Datum verwendet, der Eintrag in der Key-Chain war erst ab 08.02.2023 gültig, allerdings lief der Switch noch auf 07.02.2023.

Tue Feb  7 14:17:46 : ospf_0 AUTH ERR message:
+++ ospfAuthSet: Set crypto auth error (-1)! intf 192.168.20.7, ipda 224.0.0.5.

Tue Feb  7 14:17:46 : ospf_0 SEND INFO message:
+++ ospfIpSend: Set auth failed on pkt, intf 192.168.20.7, ipda 224.0.0.5. digestLen -1

Tue Feb  7 14:24:43 : ospf_0 AUTH ERR message:
+++ ospfAuthCheck: Intf 192.168.20.7: Auth type 2 mismatch! recvd pkt = (0)

sw7 (6860-A) -> security key 123 algorithm sha256 key ALESecret2023 start-time 02/08/2023 00:00
ERROR: Plaintext keylength supported range is [16-118]

Derzeit wird nur SHA256 unterstützt

sw7 (6860-A) -> security key 222 algorithm sha512 key ALESecret2023bbbb start-time 02/06/2023 00:00
ERROR: Unsupported auth-type! Only sha256 is supported in this release