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+.. _macsec-interface:
+
+######
+MACsec
+######
+
+MACsec is an IEEE standard (IEEE 802.1AE) for MAC security, introduced in 2006.
+It defines a way to establish a protocol independent connection between two
+hosts with data confidentiality, authenticity and/or integrity, using
+GCM-AES-128. MACsec operates on the Ethernet layer and as such is a layer 2
+protocol, which means it's designed to secure traffic within a layer 2 network,
+including DHCP or ARP requests. It does not compete with other security
+solutions such as IPsec (layer 3) or TLS (layer 4), as all those solutions are
+used for their own specific use cases.
+
+*************
+Configuration
+*************
+
+Common interface configuration
+==============================
+
+.. cmdinclude:: ../_include/interface-common-with-dhcp.txt
+   :var0: macsec
+   :var1: macsec0
+
+MACsec options
+==============
+
+.. cfgcmd:: set interfaces macsec <interface> security cipher [gcm-aes-128]
+
+  Select cipher suite used for cryptographic operations. This setting is
+  mandatory.
+
+  .. note:: gcm-aes-256 support planned once iproute2 package is updated to
+     version >=5.2.
+
+.. cfgcmd:: set interfaces macsec <interface> security encrypt
+
+  MACsec only provides authentication by default, encryption is optional. This
+  command will enable encryption for all outgoing packets.
+
+.. cfgcmd:: set interfaces macsec <interface> source-interface <physical-source>
+
+  A physical interface is required to connect this MACsec instance to. Traffic
+  leaving this interfac will now be authenticated/encrypted.
+
+Key Management
+--------------
+
+:abbr:`MKA (MACsec Key Agreement protocol)` is used to synchronize keys between
+individual peers.
+
+.. cfgcmd:: set interfaces macsec <interface> security mka cak <key>
+
+  IEEE 802.1X/MACsec pre-shared key mode. This allows to configure MACsec with
+  a pre-shared key using a (CAK,CKN) pair.
+
+.. cfgcmd:: set interfaces macsec <interface> security mka ckn <key>
+
+  CAK Name
+
+.. cfgcmd:: set interfaces macsec <interface> security mka priority <priority>
+
+  The peer with lower priority will become the key server and start
+  distributing SAKs.
+
+Replay protection
+-----------------
+
+.. cfgcmd:: set interfaces macsec <interface> security replay-window <window>
+
+  IEEE 802.1X/MACsec replay protection window. This determines a window in which
+  replay is tolerated, to allow receipt of frames that have been misordered by
+  the network.
+
+  - ``0``: No replay window, strict check
+  - ``1-4294967295``: Number of packets that could be misordered
+
+*********
+Operation
+*********
+
+.. opcmd:: run generate macsec mka-cak
+
+  Generate :abbr:`MKA (MACsec Key Agreement protocol)` CAK key
+
+  .. code-block:: none
+
+    vyos@vyos:~$ generate macsec mka-cak
+    20693b6e08bfa482703a563898c9e3ad
+
+
+.. opcmd:: run generate macsec mka-ckn
+
+  Generate :abbr:`MKA (MACsec Key Agreement protocol)` CAK key
+
+  .. code-block:: none
+
+    vyos@vyos:~$ generate macsec mka-ckn
+    88737efef314ee319b2cbf30210a5f164957d884672c143aefdc0f5f6bc49eb2
+
+.. opcmd:: show interfaces macsec
+
+  List all MACsec interfaces
+
+  .. code-block:: none
+
+    vyos@vyos:~$ show interfaces macsec
+    17: macsec1: protect on validate strict sc off sa off encrypt on send_sci on end_station off scb off replay off
+        cipher suite: GCM-AES-128, using ICV length 16
+        TXSC: 005056bfefaa0001 on SA 0
+    20: macsec0: protect on validate strict sc off sa off encrypt off send_sci on end_station off scb off replay off
+        cipher suite: GCM-AES-128, using ICV length 16
+        TXSC: 005056bfefaa0001 on SA 0
+
+.. opcmd:: show interfaces macsec <interface>
+
+  Show specific MACsec interface information
+
+  .. code-block:: none
+
+    vyos@vyos:~$ show interfaces macsec macsec1
+    17: macsec1: protect on validate strict sc off sa off encrypt on send_sci on end_station off scb off replay off
+        cipher suite: GCM-AES-128, using ICV length 16
+        TXSC: 005056bfefaa0001 on SA 0
+
+********
+Examples
+********
+
+* Two routers connected both via eth1 through an untrusted switch
+* R1 has 192.0.2.1/24 & 2001:db8::1/64
+* R2 has 192.0.2.2/24 & 2001:db8::2/64
+
+**R1**
+
+.. code-block:: none
+
+  set interfaces macsec macsec1 address '192.0.2.1/24'
+  set interfaces macsec macsec1 address '2001:db8::1/64'
+  set interfaces macsec macsec1 security cipher 'gcm-aes-128'
+  set interfaces macsec macsec1 security encrypt
+  set interfaces macsec macsec1 security mka cak '232e44b7fda6f8e2d88a07bf78a7aff4'
+  set interfaces macsec macsec1 security mka ckn '40916f4b23e3d548ad27eedd2d10c6f98c2d21684699647d63d41b500dfe8836'
+  set interfaces macsec macsec1 source-interface 'eth1'
+
+**R2**
+
+.. code-block:: none
+
+  set interfaces macsec macsec1 address '192.0.2.2/24'
+  set interfaces macsec macsec1 address '2001:db8::2/64'
+  set interfaces macsec macsec1 security cipher 'gcm-aes-128'
+  set interfaces macsec macsec1 security encrypt
+  set interfaces macsec macsec1 security mka cak '232e44b7fda6f8e2d88a07bf78a7aff4'
+  set interfaces macsec macsec1 security mka ckn '40916f4b23e3d548ad27eedd2d10c6f98c2d21684699647d63d41b500dfe8836'
+  set interfaces macsec macsec1 source-interface 'eth1'
+
+Pinging (IPv6) the other host and intercepting the traffic in ``eth1`` will
+show you the content is encrypted.
+
+.. code-block:: none
+
+  17:35:44.586668 00:50:56:bf:ef:aa > 00:50:56:b3:ad:d6, ethertype Unknown (0x88e5), length 150:
+          0x0000:  2c00 0000 000a 0050 56bf efaa 0001 d9fb  ,......PV.......
+          0x0010:  920a 8b8d 68ed 9609 29dd e767 25a4 4466  ....h...)..g%.Df
+          0x0020:  5293 487b 9990 8517 3b15 22c7 ea5c ac83  R.H{....;."..\..
+          0x0030:  4c6e 13cf 0743 f917 2c4e 694e 87d1 0f09  Ln...C..,NiN....
+          0x0040:  0f77 5d53 ed75 cfe1 54df 0e5a c766 93cb  .w]S.u..T..Z.f..
+          0x0050:  c4f2 6e23 f200 6dfe 3216 c858 dcaa a73b  ..n#..m.2..X...;
+          0x0060:  4dd1 9358 d9e4 ed0e 072f 1acc 31c4 f669  M..X...../..1..i
+          0x0070:  e93a 9f38 8a62 17c6 2857 6ac5 ec11 8b0e  .:.8.b..(Wj.....
+          0x0080:  6b30 92a5 7ccc 720b                      k0..|.r.
+
+Disabling the encryption on the link by removing ``security encrypt`` will show
+the unencrypted but authenticated content.
+
+.. code-block:: none
+
+  17:37:00.746155 00:50:56:bf:ef:aa > 00:50:56:b3:ad:d6, ethertype Unknown (0x88e5), length 150:
+          0x0000:  2000 0000 0009 0050 56bf efaa 0001 86dd  .......PV.......
+          0x0010:  6009 86f3 0040 3a40 2001 0db8 0000 0000  `....@:@........
+          0x0020:  0000 0000 0000 0001 2001 0db8 0000 0000  ................
+          0x0030:  0000 0000 0000 0002 8100 d977 0f30 0003  ...........w.0..
+          0x0040:  1ca0 c65e 0000 0000 8d93 0b00 0000 0000  ...^............
+          0x0050:  1011 1213 1415 1617 1819 1a1b 1c1d 1e1f  ................
+          0x0060:  2021 2223 2425 2627 2829 2a2b 2c2d 2e2f  .!"#$%&'()*+,-./
+          0x0070:  3031 3233 3435 3637 87d5 eed3 3a39 d52b  01234567....:9.+
+          0x0080:  a282 c842 5254 ef28                      ...BRT.(
+