Configuring MACsec Encryption

Prerequisites for MACsec Encryption

This section list the prerequisites for MACsec encryption:

Enable the ssci-based-on-sci command while configuring MACsec encryption on the device to allow interoperability with non-Cisco and non-IOS XE devices.
Ensure that 802.1x authentication and AAA are configured on your device.

Prerequisites for Certificate-Based MACsec

This section list the prerequisites for Certificate-Based MACsec:

Ensure that you have a Certificate Authority (CA) server configured for your network.
Generate a CA certificate.
Ensure that you have configured Cisco Identity Services Engine (ISE) Release 2.0.
Ensure that both the participating devices, the CA server, and Cisco Identity Services Engine (ISE) are synchronized using Network Time Protocol (NTP). If time is not synchronized on all your devices, certificates will not be validated.

Restrictions for MACsec Encryption

MACsec Key Agreement (MKA) is not supported with high availability.
MACsec with MKA is supported only on point-to-point links.
MACsec configuration is not supported on EtherChannel ports. Instead, MACsec configuration can be applied on the individual member ports of an EtherChannel. To remove MACsec configuration, you must first unbundle the member ports from the EtherChannel, and then remove it from the individual member ports.
Cisco Catalyst 9200 Series Switches support only 128-bit MACsec encryption.
Cisco Catalyst 9200CX Series Switches (C9200CX-12P-2X2G, C9200CX-8P-2X2G, and C9200CX-12T-2X2G) support both 128-bit and 256-bit MACsec encryption.
Certificate-based MACsec is supported only if the access-session is configured as closed or in multiple-host mode. None of the other configuration modes are supported.
Packet number exhaustion rekey is not supported.
If the dot1q tag vlan native command is configured globally, the dot1x reauthentication will fail on trunk ports.
MACsec XPN Cipher Suites do not provide confidentiality protection with a confidentiality offset, and these together are not supported in switch-to-switch MACsec connections.
As per IEEE standards, the maximum value of replay window is 2^30-1 for MACsec XPN Cipher Suites. Even if you configure a higher value than this, it will be restricted to 2^30-1 only.
MACsec with Precision Time Protocol (PTP) is not supported.
MACsec is not supported with Multicast VPN (mVPN).
MACsec switch-to-host connections are not supported on Software-Defined Access deployments.
The should-secure access mode is supported on switch-to-switch ports only using PSK authentication.
PSK fallback key chain is not supported on Ethernet Virtual Circuit (EVC) and point-to-multipoint cases.
PSK fallback key chain supports infinite lifetime with one key only. The connectivity association key name (CKN) ID used in the fallback key chain must not match any of the CKN IDs used in the primary key chain.
EAPOL packets of EtherType 0x888E are not intercepted by the interface if MACsec or dot1x is not enabled on the interface.
If there are any intermediate switches present between two MACsec endpoints, any P2P protocols like STP or CDP will not work.
Network-Based Application Recognition (NBAR) is not supported on MACsec switch-to-host connections.
Access control options are only applicable to switch-to-switch MACsec. These options are not supported for switch-to-host MACsec.
RSPAN or ERSPAN does not capture encrypted packets at egress and decrypted packets at ingress for MACsec enabled interfaces.

Information About MACsec Encryption

The following sections provide information about MACsec encryption.

Recommendations for MACsec Encryption

This section list the recommendations for configuring MACsec encryption:

Use the confidentiality (encryption) offset as 0 in switch-to-host connections.
Use Bidirectional Forwarding and Detection (BFD) timer value as 750 milliseconds for 10Gbps ports and 1.25 seconds for any port with speed above 10Gbps.
Execute the shutdown command, and then the no shutdown command on a port, after changing any MKA policy or MACsec configuration for active sessions, so that the changes are applied to active sessions.
Set the connectivity association key (CAK) rekey overlap timer to 30 seconds or more.
Do not use Cisco TrustSec Security Association Protocol (SAP) MACsec encryption for port speeds above 10Gbps.
Do not enable both Cisco TrustSec SAP and uplink MKA at the same time on any interface.
We recommend that you use MACsec MKA encryption.

MACsec Encryption Overview

MACsec is the IEEE 802.1AE standard for authenticating and encrypting packets between two MACsec-capable devices. Catalyst switches support 802.1AE encryption with MACsec Key Agreement (MKA) on switch-to-host links for encryption between the switch and host device. The switch also supports MACsec encryption for switch-to-switch (inter-network device) security using both Cisco TrustSec Network Device Admission Control (NDAC), Security Association Protocol (SAP) and MKA-based key exchange protocol.

Note

When switch-to-switch MACSec is enabled, all traffic is encrypted, except the EAP-over-LAN (EAPOL) packets.

Link layer security can include both packet authentication between switches and MACsec encryption between switches (encryption is optional). Link layer security is supported on SAP-based MACsec.

Table 1. MACsec Support on Switch Ports
Connections	MACsec support
Switch-to-switch	MACsec MKA encryption (recommended) Cisco TrustSec SAP

Cisco TrustSec and Cisco SAP are meant only for switch-to-switch links and are not supported on switch ports connected to end hosts, such as PCs or IP phones. MKA is supported on switch-to-host facing links as well as switch-to-switch links. Host-facing links typically use flexible authentication ordering for handling heterogeneous devices with or without IEEE 802.1x, and can optionally use MKA-based MACsec encryption. Cisco NDAC and SAP are mutually exclusive with Network Edge Access Topology (NEAT), which is used for compact switches to extend security outside the wiring closet.

Media Access Control Security and MACsec Key Agreement

MACsec, defined in 802.1AE, provides MAC-layer encryption over wired networks by using out-of-band methods for encryption keying. The MACsec Key Agreement (MKA) Protocol provides the required session keys and manages the required encryption keys. MKA and MACsec are implemented after successful authentication using certificate-based MACsec or Pre Shared Key (PSK) framework.

A switch using MACsec accepts either MACsec or non-MACsec frames, depending on the policy associated with the MKA peer. MACsec frames are encrypted and protected with an integrity check value (ICV). When the switch receives frames from the MKA peer, it decrypts them and calculates the correct ICV by using session keys provided by MKA. The switch compares that ICV to the ICV within the frame. If they are not identical, the frame is dropped. The switch also encrypts and adds an ICV to any frames sent over the secured port (the access point used to provide the secure MAC service to a MKA peer) using the current session key.

The MKA Protocol manages the encryption keys used by the underlying MACsec protocol. The basic requirements of MKA are defined in 802.1x-REV. The MKA Protocol extends 802.1x to allow peer discovery with confirmation of mutual authentication and sharing of MACsec secret keys to protect data exchanged by the peers.

The EAP framework implements MKA as a newly defined EAP-over-LAN (EAPOL) packet. EAP authentication produces a master session key (MSK) shared by both partners in the data exchange. Entering the EAP session ID generates a secure connectivity association key name (CKN). The switch acts as the authenticator for both uplink and downlink; and acts as the key server for downlink. It generates a random secure association key (SAK), which is sent to the client partner. The client is never a key server and can only interact with a single MKA entity, the key server. After key derivation and generation, the switch sends periodic transports to the partner at a default interval of 2 seconds.

The packet body in an EAPOL Protocol Data Unit (PDU) is referred to as a MACsec Key Agreement PDU (MKPDU). MKA sessions and participants are deleted when the MKA lifetime (6 seconds) passes with no MKPDU received from a participant. For example, if a MKA peer disconnects, the participant on the switch continues to operate MKA until 6 seconds have elapsed after the last MKPDU is received from the MKA peer.

Note

Integrity check value (ICV) indicator in MKPDU is optional. ICV is not optional when the traffic is encrypted.

EAPoL Announcements indicate the use of the type of keying material. The announcements can be used to announce the capability of the supplicant as well as the authenticator. Based on the capability of each side, the largest common denominator of the keying material could be used.

MKA Policies

To enable MKA on an interface, a defined MKA policy should be applied to the interface. You can configure these options:

Policy name, not to exceed 16 ASCII characters.
Confidentiality (encryption) offset of 0, 30, or 50 bytes for each physical interface

Definition of Policy-Map Actions

This section describes the policy-map actions and its definition:

Activate: Applies a service template to the session.
Authenticate: Starts authentication of the session.
Authorize: Explicitly authorizes a session.
Set-domain: Explicitly sets the domain of a client.
Terminate: Terminates the method that is running, and deletes all the method details associated with the session.
Deactivate: Removes the service-template applied to the session. If not applied, no action is taken.
Set-timer: Starts a timer and gets associated with the session. When the timer expires, any action that needs to be started can be processed.
Authentication-restart: Restarts authentication.
Clear-session: Deletes a session.
Pause: Pauses authentication.

Rest of the actions as self-explanatory and are associated with authentication.

Virtual Ports

Use virtual ports for multiple secured connectivity associations on a single physical port. Each connectivity association (pair) represents a virtual port. In uplink, you can have only one virtual port per physical port. You cannot simultaneously host secured and unsecured sessions in the same VLAN on the same port. Because of this limitation, 802.1x multiple authentication mode is not supported.

The exception to this limitation is in multiple-host mode when the first MACsec supplicant is successfully authenticated and connected to a hub that is connected to the switch. A non-MACsec host connected to the hub can send traffic without authentication because it is in multiple-host mode. We do not recommend using multi-host mode because after the first successful client, authentication is not required for other clients.

Virtual ports represent an arbitrary identifier for a connectivity association and have no meaning outside the MKA Protocol. A virtual port corresponds to a separate logical port ID. Valid port IDs for a virtual port are 0x0002 to 0xFFFF. Each virtual port receives a unique secure channel identifier (SCI) based on the MAC address of the physical interface concatenated with a 16-bit port ID.

MKA Statistics

Some MKA counters are aggregated globally, while others are updated both globally and per session. You can also obtain information about the status of MKA sessions. See Example: Displaying MKA Information for further information.

Key Lifetime and Hitless Key Rollover

A MACsec key chain can have multiple pre-shared keys (PSK) each configured with a key id and an optional lifetime. A key lifetime specifies at which time the key expires. In the absence of a lifetime configuration, the default lifetime is unlimited. When a lifetime is configured, MKA rolls over to the next configured pre-shared key in the key chain after the lifetime is expired. Time zone of the key can be local or UTC. Default time zone is UTC.

You can Key rolls over to the next key within the same key chain by configuring a second key in the key chain and configuring a lifetime for the first key. When the lifetime of the first key expires, it automatically rolls over to the next key in the list. If the same key is configured on both sides of the link at the same time, then the key rollover is hitless, that is, key rolls over without traffic interruption.

On all participating devices, the MACsec key chain must be synchronised by using Network Time Protocol (NTP) and the same time zone must be used. If all the participating devices are not synchronized, the connectivity association key (CAK) rekey will not be initiated on all the devices at the same time.

Note

The lifetime of the keys need to be overlapped in order to achieve hitless key rollover.

Fallback Key

The Fallback Key feature establishes an MKA session with the pre-shared fallback key whenever the primary pre-shared key (PSK) fails to establish a session because of key mismatch. This feature prevents downtime and ensures traffic hitless scenario during CAK mismatch (primary PSK) between the peers. The purpose of the fallback key chain is to act as a last resort key. The fallback key feature is only applicable for PSK based MKA or MACsec sessions.

Replay Protection Window Size

Replay protection is a feature provided by MACsec to counter replay attacks. Each encrypted packet is assigned a unique sequence number and the sequence is verified at the remote end. Frames transmitted through a Metro Ethernet service provider network are highly susceptible to reordering due to prioritization and load balancing mechanisms used within the network.

A replay window is necessary to support the use of MACsec over provider networks that reorder frames. Frames within the window can be received out of order, but are not replay protected. The default window size is 0, which enforces strict reception ordering. The replay window size can be configured in the range of 0 to 2³²- 1.

MACsec, MKA, and 802.1x Host Modes

You can use MACsec and the MKA Protocol with 802.1x single-host mode, multi-host mode, or Multi Domain Authentication (MDA) mode. Multiple authentication mode is not supported.

Single-Host Mode

The figure shows how a single EAP authenticated session is secured by MACsec by using MKA

Multiple Host Mode

In standard (not 802.1x REV) 802.1x multiple-host mode, a port is open or closed based on a single authentication. If one user, the primary secured client services client host, is authenticated, the same level of network access is provided to any host connected to the same port. If a secondary host is a MACsec supplicant, it cannot be authenticated and traffic would not flow. A secondary host that is a non-MACsec host can send traffic to the network without authentication because it is in multiple-host mode. The figure shows MACsec in Standard Multiple-Host Unsecure Mode.

Note

Multi-host mode is not recommended because after the first successful client, authentication is not required for other clients, which is not secure.

Multiple-Domain Mode

In standard (not 802.1x REV) 802.1x multiple-domain mode, a port is open or closed based on a single authentication. If the primary user, a PC on data domain, is authenticated, the same level of network access is provided to any domain connected to the same port. If a secondary user is a MACsec supplicant, it cannot be authenticated and traffic would no flow. A secondary user, an IP phone on voice domain, that is a non-MACsec host, can send traffic to the network without authentication because it is in multiple-domain mode.

MACsec MKA using Certificate-based MACsec

MACsec MKA is supported on switch-to-switch links. Using certificate-based MACsec, you can configure MACsec MKA between device uplink ports. Certificate-based MACsec allows mutual authentication and obtains an MSK (master session key) from which the connectivity association key (CAK) is derived for MKA operations. Device certificates are carried, using certificate-based MACsec, for authentication to the AAA server.

Prerequisites for MACsec MKA using Certificate-based MACsec

Ensure that you have a Certificate Authority (CA) server configured for your network.
Generate a CA certificate.
Ensure that you have configured Cisco Identity Services Engine (ISE) Release 2.0.
Ensure that both the participating devices, the CA server, and Cisco Identity Services Engine (ISE) are synchronized using Network Time Protocol (NTP). If time is not synchronized on all your devices, certificates will not be validated.
Ensure that 802.1x authentication and AAA are configured on your device.

MACsec Connection Across Intermediate Switches

Prior to Cisco IOS XE Gibraltar 16.10.1, MACsec connection between end devices in a WAN MACsec deployment with the intermediate switches as the Cisco Catalyst 9000 Series Switches was not supported. The encrypted packets were dropped if WAN MACsec was configured on the end devices with MACsec not configured on the intermediate switches. With the ClearTag feature implemented on the ASIC, the switch forwards the encrypted packet without parsing the MACsec header.

Limitations for MACsec Connections Across Intermediate Switches

Hop-by-hop MACsec encryption with Catalyst 9000 Series switches as intermediate switches where WAN MACsec is configured on the routers is not supported.
WAN MACsec configured on the routers with intermediate switches as the Catalyst 9000 Series switches is not supported on Layer 3 VPNs.
WAN MACsec configured on the routers with intermediate switches as the Catalyst 9000 Series switches show CDP neighbors only in should-secure mode.

Switch-to-Switch MKA MACsec Must Secure Policy

Starting with Cisco IOS XE Fuji 16.8.1a, must-secure support is enabled on both the ingress and the egress. Must-secure is supported for MKA and SAP. With must-secure enabled, only EAPOL traffic will not be encrypted. The rest of the traffic will be encrypted. Unencrypted packets are dropped.

Note

Must-secure mode is enabled by default.

Prior to Cisco IOS XE Fuji 16.8.1a, should-secure was supported for MKA and SAP. With should-secure enabled, if the peer is configured for MACsec, the data traffic is encrypted, otherwise it is sent in clear text.

MKA/MACsec for Port Channel

MKA/MACsec can be configured on the port members of a port channel. MKA/MACsec is agnostic to the port channel since the MKA session is established between the port members of a port channel.

Note

Etherchannel links that are formed as part of the port channel can either be congruent or disparate i.e. the links can either be MACsec-secured or non-MACsec-secured. MKA session between the port members is established even if a port member on one side of the port channel is not configured with MACsec.

It is recommended that you enable MKA/MACsec on all the member ports for better security of the port channel.

MACsec Cipher Announcement

Cipher Announcement allows the supplicant and the authenticator to announce their respective MACsec Cipher Suite capabilities to each other. Both the supplicant and the authenticator calculate the largest common supported MACsec Cipher Suite and use the same as the keying material for the MKA session.

Note

Only the MACsec Cipher Suite capabilities which are configured in the MKA policy are announced from the authenticator to the supplicant.

There are two types of EAPOL Announcements:

Unsecured Announcements (EAPOL PDUs) : Unsecured announcements are EAPOL announcements carrying MACsec Cipher Suite capabilities in an unsecured manner. These announcements are used to decide the width of the key used for MKA session prior to authentication.
Secure Announcements (MKPDUs) : Secure announcements revalidate the MACsec Cipher Suite capabilities which were shared previously through unsecure announcements.

Once the session is authenticated, peer capabilities which were received through EAPOL announcements are revalidated with the secure announcements. If there is a mismatch in the capabilities, the MKA session tears down.

Note

The MKA session between the supplicant and the authenticator does not tear down even if the MACsec Cipher Suite Capabilities configured on both do not result in a common cipher suite.

How to Configure MACsec Encryption

The following sections provide information about the various tasks that comprise MACsec encryption.

Configuring MKA and MACsec

MACsec is disabled by default. No MKA policies are configured.

Configuring an MKA Policy

Beginning in privileged EXEC mode, follow these steps to create an MKA Protocol policy. Note that MKA also requires that you enable 802.1x.

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

mka policy policy-name

Example:

Device(config)# mka policy mka_policy

Identifies an MKA policy, and enters MKA policy configuration mode. The maximum policy name length is 16 characters.

Note

The default MACsec cipher suite in the MKA policy will always be "GCM-AES-128".

Step 4

key-server priority

Example:

Device(config-mka-policy)# key-server priority 200

Configures MKA key server options and set priority (between 0-255).

Note

When value of key server priority is set to 255, the peer can not become the key server. The key server priority value is valid only for MKA PSK; and not for MKA EAPTLS.

Step 5

include-icv-indicator

Example:

Device(config-mka-policy)# include-icv-indicator

Enables the ICV indicator in MKPDU. Use the no form of this command to disable the ICV indicator.

Step 6

macsec-cipher-suite gcm-aes-128

Example:

Device(config-mka-policy)# macsec-cipher-suite gcm-aes-128

Configures a cipher suite for deriving SAK with 128-bit encryption.

Step 7

confidentiality-offset offset-value

Example:

Device(config-mka-policy)# confidentiality-offset 0

Set the confidentiality (encryption) offset for each physical interface.

Note

Offset Value can be 0, 30 or 50. If you are using Anyconnect on the client, it is recommended to use Offset 0.

Step 8

ssci-based-on-sci

Example:

Device(config-mka-policy)# ssci-based-on-sci

(Optional) Computes Short Secure Channel Identifier (SSCI) value based on Secure Channel Identifier (SCI) value. The higher the SCI value, the lower is the SSCI value.

Step 9

end

Example:

Device(config-mka-policy)# end

Exit enters MKA policy configuration mode and returns to privileged EXEC mode.

Step 10

show mka policy

Example:

Device# show mka policy

Displays MKA policy configuration information.

Configuring Switch-to-host MACsec Encryption

Follow these steps to configure MACsec on an interface with one MACsec session for voice and one for data:

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device>enable`	Enables privileged EXEC mode. Enter the password, if prompted.
Step 2	configureterminal Example: `Device>configure terminal`	Enters the global configuration mode.
Step 3	interface `type number` Example: `Device(config)# interface GigabitEthernet 1/0/1`	Identifies the MACsec interface, and enters interface configuration mode. The interface must be a physical interface.
Step 4	switchport access vlan vlan-id Example: `Device(config-if)# switchport access vlan 1`	Configures the access VLAN for the port.
Step 5	switchport mode access Example: `Device(config-if)# switchport mode access`	Configures the interface as an access port.
Step 6	macsec Example: `Device(config-if)# macsec`	Enables 802.1ae MACsec on the interface. The macsec command enables MKA MACsec on switch-to-host links only.
Step 7	authentication event linksec fail action authorize vlan vlan-id Example: `Device(config-if)# authentication event linksec fail action authorize vlan 1`	(Optional) Specifies that the switch processes authentication link-security failures resulting from unrecognized user credentials by authorizing a restricted VLAN on the port after a failed authentication attempt.
Step 8	authentication host-mode multi-domain Example: `Device(config-if)# authentication host-mode multi-domain`	Configures authentication manager mode on the port to allow both a host and a voice device to be authenticated on the 802.1x-authorized port. If not configured, the default host mode is single.
Step 9	authentication linksec policy must-secure Example: `Device(config-if)# authentication linksec policy must-secure`	Sets the LinkSec security policy to secure the session with MACsec if the peer is available. If not set, the default is should secure.
Step 10	authentication port-control auto Example: `Device(config-if)# authentication port-control auto`	Enables 802.1x authentication on the port. The port changes to the authorized or unauthorized state based on the authentication exchange between the switch and the client.
Step 11	authentication periodic Example: `Device(config-if)# authentication periodic`	(Optional) Enables or disables re-authentication for this port .
Step 12	authentication timer reauthenticate Example: `Device(config-if)# authentication timer reauthenticate`	(Optional) Enters a value between 1 and 65535 (in seconds). Obtains re-authentication timeout value from the server. Default re-authentication time is 3600 seconds.
Step 13	authentication violation protect Example: `Device(config-if)# configure terminal`	Configures the port to drop unexpected incoming MAC addresses when a new device connects to a port or when a device connects to a port after the maximum number of devices are connected to that port. If not configured, the default is to shut down the port.
Step 14	mka policy `policy-name` Example: `Device(config-if)# mka policy mka_policy`	Applies an existing MKA protocol policy to the interface, and enable MKA on the interface. If no MKA policy was configured (by entering themka policy global configuration command).
Step 15	dot1x pae authenticator Example: `Device(config-if)# dot1x pae authenticator`	Configures the port as an 802.1x port access entity (PAE) authenticator.
Step 16	spanning-tree portfast Example: `Device(config-if)# spanning-tree portfast`	Enables spanning tree Port Fast on the interface in all its associated VLANs. When the Port Fast feature is enabled, the interface changes directly from a blocking state to a forwarding state without making the intermediate spanning-tree state changes
Step 17	end Example: `Device(config)# end`	Exits interface configuration mode and returns to privileged EXEC mode.
Step 18	show authentication session interface `interface-id` Example: `Device# show authentication session interface GigabitEthernet 1/0/1`	Verifies the authorized session security status.
Step 19	show mka sessions Example: `Device# show mka sessions`	Verifies the established MKA sessions.

Configuring MACsec MKA using PSK

Beginning in privileged EXEC mode, follow these steps to configure MACsec MKA policies using a Pre Shared Key (PSK).

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

key chain key-chain-name macsec

Example:

Device(config)# key chain keychain1 macsec

Configures a key chain and enters the key chain configuration mode.

Step 4

key hex-string

Example:

Device(config-key-chain)# key 1000

Configures a unique identifier for each key in the keychain and enters the keychain's key configuration mode.

Note

For 128-bit encryption, use any value between 1 and 32 hex digit key-string.

Step 5

cryptographic-algorithm {aes-128-cmac | aes-256-cmac}

Example:

Device(config-key-chain)# cryptographic-algorithm aes-128-cmac

Set cryptographic authentication algorithm with 128-bit or 256-bit encryption.

Step 6

key-string { [0|6|7] pwd-string | pwd-string}

Example:

Device(config-key-chain)# key-string 12345678901234567890123456789012

Sets the password for a key string. Only hex characters must be entered.

Step 7

lifetime local [start timestamp {hh::mm::ss | day | month | year}] [duration seconds | end timestamp {hh::mm::ss | day | month | year}]

Example:

Device(config-key-chain)# lifetime local 12:12:00 July 28 2016 12:19:00 July 28 2016

Sets the lifetime of the pre shared key.

Step 8

end

Example:

Device(config-key-chain)# end

Exits key chain configuration mode and returns to privileged EXEC mode.

Configuring MACsec MKA on an Interface using PSK

Beginning in privileged EXEC mode, follow these steps to configure MACsec MKA policies on an interface using a Pre Shared Key (PSK).

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device> enable`	Enables privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: `Device# configure terminal`	Enters global configuration mode.
Step 3	interface interface-id Example: `Device(config-if)# interface GigabitEthernet 0/0/0`	Enters interface configuration mode.
Step 4	macsec network-link Example: `Device(config-if)# macsec network-link`	Enables MACsec on the interface.
Step 5	mka policy policy-name Example: `Device(config-if)# mka policy mka_policy`	Configures an MKA policy.
Step 6	mka pre-shared-key key-chain `key-chain name` [fallback key-chain `key-chain name`] Example: `Device(config-if)# mka pre-shared-key key-chain key-chain-name`	Configures an MKA pre-shared-key key-chain name.
Step 7	macsec replay-protection window-size frame number Example: `Device(config-if)# macsec replay-protection window-size 10`	Sets the MACsec window size for replay protection.
Step 8	end Example: `Device(config-if)# end`	Exits interface configuration mode and returns to privileged EXEC mode.

What to do next

It is not recommended to change the MKA policy on an interface with MKA PSK configured when the session is running. However, if a change is required, you must reconfigure the policy as follows:

Disable the existing session by removing macsec network-link configuration on each of the participating node using the no macsec network-link command
Configure the MKA policy on the interface on each of the participating node using the mka policy policy-name command.
Enable the new session on each of the participating node by using the macsec network-link command.

Configuring MACsec MKA using Certificate-based MACsec

To configure MACsec with MKA on point-to-point links, perform these tasks:

Configure Certificate Enrollment
- Generate Key Pairs
- Configure SCEP Enrollment
- Configure Certificates Manually
Configure an Authentication Policy
Configure certificate-based MACsec Profiles and IEEE 802.1x Credentials
Configure MKA MACsec using certificate-based MACsec on Interfaces

Generating Key Pairs

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device> enable`	Enables privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: `Device# configure terminal`	Enters global configuration mode.
Step 3	crypto key generate rsa label label-name general-keys modulus size Example: `Device(config)# crypto key generate rsa label general-keys modulus 2048`	Generates a RSA key pair for signing and encryption. You can also assign a label to each key pair using the label keyword. The label is referenced by the trustpoint that uses the key pair. If you do not assign a label, the key pair is automatically labeled <Default-RSA-Key>. If you do not use additional keywords this command generates one general purpose RSA key pair. If the modulus is not specified, the default key modulus of 1024 is used. You can specify other modulus sizes with the modulus keyword.
Step 4	end Example: `Device(config)# end`	Exits global configuration mode and returns to privileged EXEC mode.
Step 5	show authentication session interface interface-id Example: `Device# show authentication session interface gigabitethernet 0/1/1`	Verifies the authorized session security status.

Configuring Enrollment using SCEP

Simple Certificate Enrollment Protocol (SCEP) is a Cisco-developed enrollment protocol that uses HTTP to communicate with the certificate authority (CA) or registration authority (RA). SCEP is the most commonly used method for sending and receiving requests and certificates.

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

crypto pki trustpoint server name

Example:

Device(config)# crypto pki trustpoint ka

Declares the trustpoint and a given name and enters ca-trustpoint configuration mode.

Step 4

enrollment url url name pem

Example:

Device(ca-trustpoint)# enrollment url http://url:80

Specifies the URL of the CA on which your device should send certificate requests.

An IPv6 address can be added in the URL enclosed in brackets. For example: http:// [2001:DB8:1:1::1]:80.

The pem keyword adds privacy-enhanced mail (PEM) boundaries to the certificate request.

Step 5

rsakeypair label

Example:

Device(ca-trustpoint)# rsakeypair exampleCAkeys

Specifies which key pair to associate with the certificate.

Note

The rsakeypair name must match the trust-point name.

Step 6

serial-number none

Example:

Device(ca-trustpoint)# serial-number none

The none keyword specifies that a serial number will not be included in the certificate request.

Step 7

ip-address none

Example:

Device(ca-trustpoint)# ip-address none

The none keyword specifies that no IP address should be included in the certificate request.

Step 8

revocation-check crl

Example:

Device(ca-trustpoint)# revocation-check crl

Specifies CRL as the method to ensure that the certificate of a peer has not been revoked.

Step 9

auto-enroll percent regenerate

Example:

Device(ca-trustpoint)# auto-enroll 90 regenerate

Enables auto-enrollment, allowing the client to automatically request a rollover certificate from the CA.

If auto-enrollment is not enabled, the client must be manually re-enrolled in your PKI upon certificate expiration.

By default, only the Domain Name System (DNS) name of the device is included in the certificate.

Use the percent argument to specify that a new certificate will be requested after the percentage of the lifetime of the current certificate is reached.

Use the regenerate keyword to generate a new key for the certificate even if a named key already exists.

If the key pair being rolled over is exportable, the new key pair will also be exportable. The following comment will appear in the trustpoint configuration to indicate whether the key pair is exportable: “! RSA key pair associated with trustpoint is exportable.”

It is recommended that a new key pair be generated for security reasons.

Step 10

exit

Example:

Device(ca-trustpoint)# exit

Exits ca-trustpoint configuration mode and returns to global configuration mode.

Step 11

crypto pki authenticate name

Example:

Device(config)# crypto pki authenticate myca

Retrieves the CA certificate and authenticates it.

Step 12

end

Example:

Device(config)# end

Exits global configuration mode and returns to privileged EXEC mode.

Step 13

show crypto pki certificate trustpoint name

Example:

Device# show crypto pki certificate ka

Displays information about the certificate for the trust point.

Configuring Enrollment Manually

If your CA does not support SCEP or if a network connection between the router and CA is not possible. Perform the following task to set up manual certificate enrollment:

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

crypto pki trustpoint server name

Example:

Device# crypto pki trustpoint ka

Declares the trustpoint and a given name and enters ca-trustpoint configuration mode.

Step 4

enrollment url url name pem

Example:

Device(ca-trustpoint)# enrollment url http://url:80

Specifies the URL of the CA on which your device should send certificate requests.

An IPv6 address can be added in the URL enclosed in brackets. For example: http:// [2001:DB8:1:1::1]:80.

The pem keyword adds privacy-enhanced mail (PEM) boundaries to the certificate request.

Step 5

rsakeypair label

Example:

Device(ca-trustpoint)#  rsakeypair exampleCAkeys

Specifies which key pair to associate with the certificate.

Step 6

serial-number none

Example:

Device(ca-trustpoint)# serial-number none

The none keyword specifies that a serial number will not be included in the certificate request.

Step 7

ip-address none

Example:

Device(ca-trustpoint)# ip-address none

The none keyword specifies that no IP address should be included in the certificate request.

Step 8

revocation-check crl

Example:

Device(ca-trustpoint)# revocation-check crl

Specifies CRL as the method to ensure that the certificate of a peer has not been revoked.

Step 9

exit

Example:

Device(ca-trustpoint)# exit

Exits ca-trustpoint configuration mode and returns to global configuration mode.

Step 10

crypto pki authenticate name

Example:

Device(config)# crypto pki authenticate myca

Retrieves the CA certificate and authenticates it.

Step 11

crypto pki enroll name

Example:

Device(config)# crypto pki enroll myca

Generates certificate request and displays the request for copying and pasting into the certificate server.

Enter enrollment information when you are prompted. For example, specify whether to include the device FQDN and IP address in the certificate request.

You are also given the choice about displaying the certificate request to the console terminal.

The base-64 encoded certificate with or without PEM headers as requested is displayed.

Step 12

crypto pki import name certificate

Example:

Device(config)# crypto pki import myca certificate

Imports a certificate via TFTP at the console terminal, which retrieves the granted certificate.

The device attempts to retrieve the granted certificate via TFTP using the same filename used to send the request, except the extension is changed from “.req” to “.crt”. For usage key certificates, the extensions “-sign.crt” and “-encr.crt” are used.

The device parses the received files, verifies the certificates, and inserts the certificates into the internal certificate database on the switch.

Note

Some CAs ignore the usage key information in the certificate request and issue general purpose usage certificates. If your CA ignores the usage key information in the certificate request, only import the general purpose certificate. The router will not use one of the two key pairs generated.

Step 13

end

Example:

Device(config)# end

Exits global configuration mode and returns to privileged EXEC mode.

Step 14

show crypto pki certificate trustpoint name

Example:

Device# show crypto pki certificate  ka

Displays information about the certificate for the trust point.

Configuring Switch-to-switch MACsec Encryption

To apply MACsec MKA using certificate-based MACsec to interfaces, perform the following task:

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device> enable`	Enables privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: `Device# configure terminal`	Enters global configuration mode.
Step 3	interface `type number` Example: `Device(config)# interface gigabitethernet 0/2/1`	Identifies the MACsec interface, and enters interface configuration mode. The interface must be a physical interface.
Step 4	macsec network-link Example: `Device(config-if)# macsec network-link`	Enables MACsec on the interface.
Step 5	authentication periodic Example: `Device(config-if)# authentication periodic`	Enables reauthentication for this port.
Step 6	authentication timer reauthenticate interval Example: `Device(config-if)# authentication timer reauthenticate interval`	Sets the reauthentication interval.
Step 7	access-session host-mode multi-host Example: `Device(config-if)# access-session host-mode multi-host`	Allows hosts to gain access to the interface.
Step 8	access-session closed Example: `Device(config-if)# access-session closed`	Prevents preauthentication access on the interface.
Step 9	access-session port-control auto Example: `Device(config-if)# access-session port-control auto`	Sets the authorization state of a port.
Step 10	dot1x pae both Example: `Device(config-if)# dot1x pae both`	Configures the port as an 802.1X port access entity (PAE) supplicant and authenticator.
Step 11	dot1x credentials profile Example: `Device(config-if)# dot1x credentials profile`	Assigns a 802.1x credentials profile to the interface.
Step 12	end Example: `Device(config-if)# end`	Exits interface configuration mdoe and returns to privileged EXEC mode.
Step 13	show macsec interface `interface-id` Example: `Device# show macsec interface GigabitEthernet 1/0/1`	Displays MACsec details for the interface.

Configuring MKA/MACsec for Port Channel using PSK

Beginning in privileged EXEC mode, follow these steps to configure MKA policies on an interface using a Pre Shared Key (PSK).

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface interface-id

Example:

Device(config-if)# interface gigabitethernet 1/0/3

Enters interface configuration mode.

Step 4

macsec network-link

Example:

Device(config-if)# macsec network-link

Enables MACsec on the interface. Supports layer 2 and layer 3 port channels.

Step 5

mka policy policy-name

Example:

Device(config-if)# mka policy mka_policy

Configures an MKA policy.

Step 6

mka pre-shared-key key-chain key-chain name [fallback key-chain key-chain name]

Example:

Device(config-if)# mka pre-shared-key key-chain key-chain-name

Configures an MKA pre-shared-key key-chain name.

Note

The MKA pre-shared key can be configured on either physical interface or sub-interfaces and not on both.

Step 7

macsec replay-protection window-size frame number

Example:

Device(config-if)# macsec replay-protection window-size 0

Sets the MACsec window size for replay protection.

Step 8

channel-group channel-group-number mode {auto | desirable} | {active | passive} | {on}

Example:

Device(config-if)# channel-group 3 mode auto active on

Configures the port in a channel group and sets the mode.

Note

You cannot configure ports in a channel group without configuring MACsec on the interface. You must configure the commands in Step 3, 4, 5 and 6 before this step.

The channel-number range is from 1 to 4096. The port channel associated with this channel group is automatically created if the port channel does not already exist.For mode, select one of the following keywords:

auto — Enables PAgP only if a PAgP device is detected. This places the port into a passive negotiating state, in which the port responds to PAgP packets it receives but does not start PAgP packet negotiation.

Note

The auto keyword is not supported when EtherChannel members are from different switches in the switch stack.

desirable — Unconditionally enables PAgP. This places the port into an active negotiating state, in which the port starts negotiations with other ports by sending PAgP packets.

Note

The desirable keyword is not supported when EtherChannel members are from different switches in the switch stack.

on — Forces the port to channel without PAgP or LACP. In the on mode, an EtherChannel exists only when a port group in the on mode is connected to another port group in the on mode.
active — Enables LACP only if a LACP device is detected. It places the port into an active negotiating state in which the port starts negotiations with other ports by sending LACP packets.
passive — Enables LACP on the port and places it into a passive negotiating state in which the port responds to LACP packets that it receives, but does not start LACP packet negotiation.

Step 9

end

Example:

Device(config-if)# cend

Exits interface configuration mode and returns to privileged EXEC mode.

Configuring Port Channel Logical Interfaces for Layer 2 EtherChannels

To create a port channel interface for a Layer 2 EtherChannel, perform this task:

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

interface port-channel channel-group-number

Example:

Device(config)# interface port-channel 1

Creates the port channel interface.

Note

Use the no form of this command to delete the port channel interface.

Step 4

switchport

Example:

Device(config-if)# switchport

Switches an interface that is in Layer 3 mode into Layer 2 mode for Layer 2 configuration.

Step 5

switchport mode {access | trunk}

Example:

Device(config-if)# switchport mode access

Assigns all ports as static-access ports in the same VLAN, or configure them as trunks.

Step 6

end

Example:

Device(config-if)# end

Exits interface configuration mode and returns to privileged EXEC mode.

Configuring Port Channel Logical Interfaces for Layer 3 EtherChannels

To create a port channel interface for a Layer 3 EtherChannel, perform this task:

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device> enable`	Enables privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: `Device# configure terminal`	Enters global configuration mode.
Step 3	interface interface-id Example: `Device(config)# interface gigabitethernet 1/0/2`	Enters interface configuration mode.
Step 4	no switchport Example: `Device(config-if)# no switchport`	Switches an interface that is in Layer 2 mode into Layer 3 mode for Layer 3 configuration.
Step 5	ip address `ip-address subnet_mask` Example: `Device(config-if)# ip address 10.2.2.3 255.255.255.254`	Assigns an IP address and subnet mask to the EtherChannel.
Step 6	end Example: `Device(config-if)# end`	Exits interface configuration mode and returns to privileged EXEC mode.

Configuring MACsec Cipher Announcement

The following sections provide information about the various tasks to configure MACsec cipher announcement.

Configuring an MKA Policy for Secure Announcement

Beginning in privileged EXEC mode, follow these steps to create an MKA Protocol policy to enable secure announcement in MKPDUs. By default, secure announcements are disabled.

Procedure

Command or Action Purpose

Step 1

enable

Example:

Device> enable

Enables privileged EXEC mode.

Enter your password, if prompted.

Step 2

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 3

mka policy policy-name

Example:

Device(config)# mka policy mka_policy

Identifies an MKA policy and enters MKA policy configuration mode. The maximum policy name length is 16 characters.

Note

The default MACsec cipher suite in the MKA policy is GCM-AES-128.

Step 4

key-server priority

Example:

Device(config-mka-policy)# key-server priority 200

Configures MKA key server options and sets priority between 0-255.

Note

When value of key server priority is set to 255, the peer cannot become the key server. The key server priority value is valid only for MKA PSK. This does not apply to MKA EAP-TLS.

Step 5

send-secure-announcements

Example:

Device(config-mka-policy)# send-secure-announcements

Enables sending of secure announcements. Use the no form of the command to disable sending of secure announcements. By default, secure announcements are disabled.

Step 6

macsec-cipher-suite gcm-aes-128

Example:

Device(config-mka-policy)# macsec-cipher-suite gcm-aes-128

Configures cipher suite for deriving SAK with 128-bit encryption.

Step 7

end

Example:

Device(config-mka-policy)# end

Exits MKA policy configuration mode and returns to privileged EXEC mode.

Step 8

show mka policy

Example:

Device# show mka policy

Displays MKA policies.

Configuring Secure Announcement Globally

Beginning in privileged EXEC mode, follow these steps to enable secure announcement globally across all the MKA policies.

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device> enable`	Enables privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: `Device# configure terminal`	Enters global configuration mode.
Step 3	mka defaults policy send-secure-announcements Example: `Device(config)# mka defaults policy send-secure-announcements`	Enables sending of secure announcements in MKPDUs across MKA policies. By default, secure announcements are disabled.
Step 4	end Example: `Device(config)# end`	Exits global configuration mode and returns to privileged EXEC mode.

Configuring EAPOL Announcements on an Interface

Beginning in privileged EXEC mode, follow these steps to configure EAPOL Announcement on an interface.

Procedure

	Command or Action	Purpose
Step 1	enable Example: `Device> enable`	Enables privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: `Device# configure terminal`	Enters global configuration mode.
Step 3	interface `interface-id` Example: `Device(config)# interface gigabitethernet 1/0/1`	Identifies the MACsec interface, and enters interface configuration mode. The interface must be a physical interface.
Step 4	eapol annoucement Example: `Device(config-if)# eapol announcement`	Enables EAPOL announcements. Use the no form of the command to disable EAPOL announcements. By default, EAPOL announcements are disabled.
Step 5	end Example: `Device(config-if)# configure terminal`	Exits interface configuration mode and returns to privileged EXEC mode.

Configuring Cisco TrustSec MACsec

Configuring Cisco TrustSec Switch-to-Switch Link Security in Manual Mode

Before you begin

When manually configuring Cisco TrustSec on an interface, consider these usage guidelines and restrictions:

If no SAP parameters are defined, Cisco TrustSec encapsulation or encryption is not performed.
If you select GCM as the SAP operating mode, you must have a MACsec Encryption software license from Cisco. If you select GCM without the required license, the interface is forced to a link-down state.
These protection levels are supported when you configure SAP pairwise master key (sap pmk):
- SAP is not configured: no protection.
- sap mode-list gcm-encrypt gmac no-encap : protection desirable but not mandatory.
- sap mode-list gcm-encrypt gmac : confidentiality preferred and integrity required. The protection is selected by the supplicant according to supplicant preference.
- sap mode-list gmac : integrity only.
- sap mode-list gcm-encrypt : confidentiality required.
- sap mode-list gmac gcm-encrypt : integrity required and preferred, confidentiality optional.
Before changing the configuration from MKA to Cisco TrustSec SAP and vice versa, we recommend that you remove the interface configuration.

Beginning in privileged EXEC mode, follow these steps to manually configure Cisco TrustSec on an interface to another Cisco TrustSec device:

Procedure

Command or Action Purpose

Step 1

configure terminal

Example:

Device# configure terminal

Enters global configuration mode.

Step 2

interface interface-id

Example:

Device(config)# interface tengigabitethernet 1/1/2

Note

Enters interface configuration mode.

Step 3

cts manual

Example:

Device(config-if)# cts manual

Enters Cisco TrustSec manual configuration mode.

Step 4

sap pmk key [ mode-list mode1 [ mode2 [ mode3 [ mode4] ] ] ]

Example:

Device(config-if-cts-manual)# sap pmk 1234abcdef mode-list gcm-encrypt null no-encap

(Optional) Configures the SAP pairwise master key (PMK) and operation mode. SAP is disabled by default in Cisco TrustSec manual mode.

key : A hexadecimal value with an even number of characters and a maximum length of 32 characters.

The SAP operation mode options:

gcm-encrypt : Authentication and encryption

Note

Select this mode for MACsec authentication and encryption if your software license supports MACsec encryption.

gmac : Authentication, no encryption
no-encap : No encapsulation

null : Encapsulation, no authentication or encryption

Note

If the interface is not capable of data link encryption, no-encap is the default and the only available SAP operating mode. SGT is not supported.

Step 5

no propagate sgt

Example:

Device(config-if-cts-manual)# no propagate sgt

Use the no form of this command when the peer is incapable of processing a SGT. The no propagate sgt command prevents the interface from transmitting the SGT to the peer.

Step 6

exit

Example:

Device(config-if-cts-manual)# exit

Exits Cisco TrustSec 802.1x interface configuration mode.

Step 7

end

Example:

Device(config-if)# end

Returns to privileged EXEC mode.

Step 8

show cts interface [ interface-id | brief | summary]

(Optional) Verify the configuration by displaying TrustSec-related interface characteristics.

Step 9

copy running-config startup-config

Example:

Device#copy running-config startup-config

(Optional) Saves your entries in the configuration file.

Configuring Examples for MACsec Encryption

Example: Configuring MKA and MACsec

This example shows how to create an MKA policy:

Device> enable
Device# configure terminal
Device(config)# mka policy mka_policy
Device(config-mka-policy)# key-server priority 200
Device(config-mka-policy)# macsec-cipher-suite gcm-aes-128
Device(config-mka-policy)# confidentiality-offset 30
Device(config-mka-policy)# ssci-based-on-sci
Device(config-mka-policy)#end

This example shows how to configure MACsec on an interface:

Device> enable
Device# configure terminal
Device(config)# interface GigabitEthernet 1/0/1
Device(config-if)# switchport access vlan 1
Device(config-if)# switchport mode access
Device(config-if)# macsec
Device(config-if)#access-session event linksec fail action authorize vlan 1
Device(config-if)# access-session host-mode multi-domain
Device(config-if)# access-session linksec policy must-secure
Device(config-if)# access-session port-control auto
Device(config-if)#authentication periodic
Device(config-if)# authentication timer reauthenticate
Device(config-if)# authentication violation protect
Device(config-if)#mka policy mka_policy
Device(config-if)# dot1x pae authenticator
Device(config-if)# spanning-tree portfast
Device(config-if)#end

Examples: Configuring MACsec MKA using PSK

This example shows how to configure MACsec MKA using PSK.

Device> enable
Device# configure terminal
Device(config)# Key chain keychain1 macsec
Device(config-keychain)# key 1000
Device(config-keychain-key)# cryptographic-algorithm aes-128-cmac
Device(config-keychain-key)# key-string 12345678901234567890123456789012
Device(config-keychain-key)# lifetime local 12:12:00 July 28 2016 12:19:00 July 28 2016
Device(config-keychain-key)# end

This example shows how to configure MACsec MKA on an interface using PSK.

Device> enable
Device# configure terminal
Device(config)# interface GigabitEthernet 0/0/0
Device(config-if)# mka policy mka_policy
Device(config-if)# mka pre-shared-key key-chain key-chain-name
Device(config-if)# macsec replay-protection window-size 10
Device(config-if)# end

MKA-PSK: CKN Behavior Change

Starting Cisco IOS XE Fuji 16.8.1 release, for MKA PSK sessions, the CKN uses exactly the same string as the CKN which is configured as the hex-string for the key, instead of the fixed 32 bytes.

Device> enable
Device# configure terminal
Device(config)# key chain abc macsec
Device(config-keychain)# key 11
Device(config-keychain-key)# cryptographic-algorithm aes-128-cmac
Device(config-keychain-key)# key-string 12345678901234567890123456789013
Device(config-keychain-key)# lifetime local 12:21:00 Sep 9 2015 infinite
Device(config-keychain-key)# end

The following is sample output of the show mka session command for the above configuration:

Device# show mka session

Total MKA Sessions....... 1
Secured Sessions... 1
Pending Sessions... 0
====================================================================================================
Interface      Local-TxSCI         Policy-Name      Inherited         Key-Server                                            
Port-ID        Peer-RxSCI          MACsec-Peers     Status            CKN                                                   
====================================================================================================
Et0/0          aabb.cc00.6600/0002     icv            NO                NO                                                    
2              aabb.cc00.6500/0002 1                Secured             11   *Note that the CKN key-string is exactly the same that has been configured for the key as hex-string.*

In case of interoperability between two images, where one having the CKN behavior change, and one without the CKN behavior change, the hex-string for the key must be a 64-character hex-string with zero padded for it to work on a device that has an image with the CKN behavior change. See the examples below:

Configuration without CKN key-string behavior change:

Device# configure terminal
Device(config)# key chain abc macsec
Device(config-keychain)# key 11
Device(config-keychain-key)# cryptographic-algorithm aes-128-cmac
Device(config-keychain-key)# key-string 12345678901234567890123456789013
Device(config-keychain-key)# lifetime local 12:21:00 Sep 9 2015 infinite
Device(config-keychain-key)# end

Configuration with CKN key-string behavior change:

Device# configure terminal
Device(config)# key chain abc macsec
Device(config-keychain)# key 1100000000000000000000000000000000000000000000000000000000000000
Device(config-keychain-key)# cryptographic-algorithm aes-128-cmac
Device(config-keychain-key)# key-string 12345678901234567890123456789013
Device(config-keychain-key)# lifetime local 12:21:00 Sep 9 2015 infinite
Device(config-keychain-key)# end

Examples: Configuring MACsec MKA using Certificate-based MACsec

This example shows how to configure MACsec MKA using certificate-based MACsec:

Device> enable
Device# configure terminal
Device(config)# interface Gigabitethernet 1/0/1
Device(config-if)# macsec network-link
Device(config-if)# authentication periodic
Device(config-if)# authentication timer reauthenticate interval
Device(config-if)#access-session host-mode multi-domain
Device(config-if)# access-session closed
Device(config-if)# access-session port-control auto
Device(config-if)# dot1x pae both
Device(config-if)#dot1x credentials profile
Device(config-if)# dot1x supplicant eap profile profile_eap_tls
Device(config-if)#service-policy type control subscriber sub1
Device(config-if)# end

Example: Configuring MACsec MKA for Port Channel using PSK

Etherchannel Mode — Static/On

The following is sample configuration on Device 1 and Device 2 with EtherChannel Mode on:

Device> enable
Device# configure terminal
Device(config)# key chain KC macsec
Device(config-key-chain)# key 1000
Device(config-key-chain)# cryptographic-algorithm aes-128-cmac
Device(config-key-chain)# key-string FC8F5B10557C192F03F60198413D7D45
Device(config-key-chain)# exit
Device(config)# mka policy POLICY
Device(config-mka-policy)# key-server priority 0
Device(config-mka-policy)# macsec-cipher-suite gcm-aes-128
Device(config-mka-policy)# confidentiality-offset 0
Device(config-mka-policy)# exit
Device(config)# interface gigabitethernet 1/0/1
Device(config-if)# channel-group 2 mode on
Device(config-if)# macsec network-link
Device(config-if)# mka policy POLICY
Device(config-if)# mka pre-shared-key key-chain KC
Device(config-if)# exit
Device(config)# interface gigabitethernet 1/0/2
Device(config-if)# channel-group 2 mode on
Device(config-if)# macsec network-link
Device(config-if)# mka policy POLICY
Device(config-if)# mka pre-shared-key key-chain KC
Device(config-if)# end

Layer 2 EtherChannel Configuration

Device 1

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# switchport
Device(config-if)# switchport mode trunk
Device(config-if)# no shutdown
Device(config-if)# end

Device 2

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# switchport
Device(config-if)# switchport mode trunk
Device(config-if)# no shutdown
Device(config-if)# end

The following is sample output from theshow etherchannel summary command:

	Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


	Number of channel-groups in use: 1
	Number of aggregators:           1

	Group  Port-channel  Protocol    Ports
	------+-------------+-----------+-----------------------------------------------
	2      Po2(RU)          -        Te1/0/1(P)  Te1/0/2(P)

Layer 3 EtherChannel Configuration

Device 1

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# no switchport
Device(config-if)# ip address 10.25.25.3 255.255.255.0
Device(config-if)# no shutdown
Device(config-if)# end

Device 2

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# no switchport
Device(config-if)# ip address 10.25.25.4 255.255.255.0
Device(config-if)# no shutdown
Device(config-if)# end

The following is sample output from the show etherchannel summary command:

	Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


	Number of channel-groups in use: 1
	Number of aggregators:           1

	Group  Port-channel  Protocol    Ports
	------+-------------+-----------+-----------------------------------------------
	2      Po2(RU)          -        Te1/0/1(P)  Te1/0/2(P)

Etherchannel Mode — LACP

The following is sample configuration on Device 1 and Device 2 with EtherChannel Mode as LACP.

Device> enable
Device# configure terminal
Device(config)# key chain KC macsec
Device(config-key-chain)# key 1000
Device(config-key-chain)# cryptographic-algorithm aes-128-cmac
Device(config-key-chain)# key-string FC8F5B10557C192F03F60198413D7D45
Device(config-key-chain)# exit
Device(config)# mka policy POLICY
Device(config-mka-policy)# key-server priority 0
Device(config-mka-policy)# macsec-cipher-suite gcm-aes-128
Device(config-mka-policy)# confidentiality-offset 0
Device(config-mka-policy)# exit
Device(config)# interface gigabitethernet 1/0/1
Device(config-if)# channel-group 2 mode active
Device(config-if)# macsec network-link
Device(config-if)# mka policy POLICY
Device(config-if)# mka pre-shared-key key-chain KC
Device(config-if)# exit
Device(config)# interface gigabitethernet 1/0/2
Device(config-if)# channel-group 2 mode active
Device(config-if)# macsec network-link
Device(config-if)# mka policy POLICY
Device(config-if)# mka pre-shared-key key-chain KC
Device(config-if)# end

Layer 2 EtherChannel Configuration

Device 1

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# switchport
Device(config-if)# switchport mode trunk
Device(config-if)# no shutdown
Device(config-if)# end

Device 2

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# switchport
Device(config-if)# switchport mode trunk
Device(config-if)# no shutdown
Device(config-if)# end

The following is sample output from the show etherchannel summary command:

	Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


	Number of channel-groups in use: 1
	Number of aggregators:           1

	------+-------------+-----------+-----------------------------------------------
	2      Po2(SU)         LACP      Te1/1/1(P)  Te1/1/2(P)

Layer 3 EtherChannel Configuration

Device 1

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# no switchport
Device(config-if)# ip address 10.25.25.3 255.255.255.0
Device(config-if)# no shutdown
Device(config-if)# end

Device 2

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# no switchport
Device(config-if)# ip address 10.25.25.4 255.255.255.0
Device(config-if)# no shutdown
Device(config-if)# end

The following is sample output from the show etherchannel summary command:

	Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


	Number of channel-groups in use: 1
	Number of aggregators:           1

	Group  Port-channel  Protocol    Ports
	------+-------------+-----------+-----------------------------------------------
	2      Po2(RU)         LACP      Te1/1/1(P)  Te1/1/2(P)

Etherchannel Mode — PAgP

The following is sample configuration on Device 1 and Device 2 with EtherChannel Mode as PAgP:

Device> enable
Device# configure terminal
Device(config)# key chain KC macsec
Device(config-key-chain)# key 1000
Device(config-key-chain)# cryptographic-algorithm aes-128-cmac
Device(config-key-chain)# key-string FC8F5B10557C192F03F60198413D7D45
Device(config-key-chain)# exit
Device(config)# mka policy POLICY
Device(config-mka-policy)# key-server priority 0
Device(config-mka-policy)# macsec-cipher-suite gcm-aes-128
Device(config-mka-policy)# confidentiality-offset 0
Device(config-mka-policy)# exit
Device(config)# interface gigabitethernet 1/0/1
Device(config-if)# channel-group 2 mode desirable
Device(config-if)# macsec network-link
Device(config-if)# mka policy POLICY
Device(config-if)# mka pre-shared-key key-chain KC
Device(config-if)# exit
Device(config)# interface gigabitethernet 1/0/2
Device(config-if)# channel-group 2 mode desirable
Device(config-if)# macsec network-link
Device(config-if)# mka policy POLICY
Device(config-if)# mka pre-shared-key key-chain KC
Device(config-if)# end

Layer 2 EtherChannel Configuration

Device 1

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# switchport
Device(config-if)# switchport mode trunk
Device(config-if)# no shutdown
Device(config-if)# end

Device 2

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# switchport
Device(config-if)# switchport mode trunk
Device(config-if)# no shutdown
Device(config-if)# end

The following shows a sample output from the show etherchannel summary command.

	Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


	Number of channel-groups in use: 1
	Number of aggregators:           1

	------+-------------+-----------+-----------------------------------------------
	2      Po2(SU)         PAgP      Te1/1/1(P)  Te1/1/2(P)

Layer 3 EtherChannel Configuration

Device 1

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# no switchport
Device(config-if)# ip address 10.25.25.3 255.255.255.0
Device(config-if)# no shutdown
Device(config-if)# end

Device 2

Device> enable
Device# configure terminal
Device(config)# interface port-channel 2
Device(config-if)# no switchport
Device(config-if)# ip address 10.25.25.4 255.255.255.0
Device(config-if)# no shutdown
Device(config-if)# end

The following is sample output from the show etherchannel summary command:

	Flags:  D - down        P - bundled in port-channel
        I - stand-alone s - suspended
        H - Hot-standby (LACP only)
        R - Layer3      S - Layer2
        U - in use      f - failed to allocate aggregator

        M - not in use, minimum links not met
        u - unsuitable for bundling
        w - waiting to be aggregated
        d - default port

        A - formed by Auto LAG


	Number of channel-groups in use: 1
	Number of aggregators:           1

	Group  Port-channel  Protocol    Ports
	------+-------------+-----------+-----------------------------------------------
	2      Po2(RU)         PAgP      Te1/1/1(P)  Te1/1/2(P)

Displaying Active MKA Sessions

The following shows all the active MKA sessions.

Device# show mka sessions interface Te1/0/1

===============================================================================
Interface      Local-TxSCI         Policy-Name      Inherited         Key-Server                                            
Port-ID        Peer-RxSCI          MACsec-Peers     Status            CKN                                                   
=========================================================================================
Te1/0/1        00a3.d144.3364/0025 POLICY           NO                NO                                                    
37             701f.539b.b0c6/0032 1                Secured           1000

Examples: Configuring MACsec Cipher Announcement

This example shows how to configure MKA policy for Secure Announcement:

Device> enable
Device# configure terminal
Device(config)# mka policy mka_policy
Device(config-mka-policy)# key-server 2
Device(config-mka-policy)# send-secure-announcements
Device(config-mka-policy)#macsec-cipher-suite gcm-aes-128confidentiality-offset 0
Device(config-mka-policy)# end

This example shows how to configure Secure Announcement globally:

Device> enable
Device# configure terminal
Device(config)# mka defaults policy send-secure-announcements
Device(config)# end

This example shows how to configure EAPoL Announcements on an interface:

Device> enable
Device# configure terminal
Device(config)# interface GigabitEthernet 1/0/1
Device(config-if)# eapol announcement
Device(config-if)# end

The following is sample output from the show running-config interface interface-name command with EAPoL announcement enabled.

Device# show running-config interface GigabitEthernet 1/0/1

switchport mode access
 macsec
 access-session host-mode multi-host
 access-session closed
 access-session port-control auto
 dot1x pae authenticator
 dot1x timeout quiet-period 10
 dot1x timeout tx-period 5
 dot1x timeout supp-timeout 10
 dot1x supplicant eap profile peap
 eapol announcement
 spanning-tree portfast
 service-policy type control subscriber Dot1X

The following is sample output from the show mka sessions interface interface-name detail command with secure announcement disabled.

Device# show mka sessions interface GigabitEthernet 1/0/1 detail


MKA Detailed Status for MKA Session
===================================
Status: SECURED - Secured MKA Session with MACsec

Local Tx-SCI............. 204c.9e85.ede4/002b
Interface MAC Address.... 204c.9e85.ede4
MKA Port Identifier...... 43
Interface Name........... GigabitEthernet1/0/1
Audit Session ID.........
CAK Name (CKN)........... 0100000000000000000000000000000000000000000000000000000000000000
Member Identifier (MI)... D46CBEC05D5D67594543CEAE
Message Number (MN)...... 89567
EAP Role................. NA
Key Server............... YES
MKA Cipher Suite......... AES-128-CMAC

Latest SAK Status........ Rx & Tx
Latest SAK AN............ 0
Latest SAK KI (KN)....... D46CBEC05D5D67594543CEAE00000001 (1)
Old SAK Status........... FIRST-SAK
Old SAK AN............... 0
Old SAK KI (KN).......... FIRST-SAK (0)

SAK Transmit Wait Time... 0s (Not waiting for any peers to respond)
SAK Retire Time.......... 0s (No Old SAK to retire)

MKA Policy Name.......... p2
Key Server Priority...... 2
Delay Protection......... NO
Replay Protection........ YES
Replay Window Size....... 0
Confidentiality Offset... 0
Algorithm Agility........ 80C201
Send Secure Announcement.. DISABLED
SAK Cipher Suite......... 0080C20001000001 (GCM-AES-128)
MACsec Capability........ 3 (MACsec Integrity, Confidentiality, & Offset)
MACsec Desired........... YES

# of MACsec Capable Live Peers............ 1
# of MACsec Capable Live Peers Responded.. 1

Live Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------
  38046BA37D7DA77E06D006A9  89555       c800.8459.e764/002a   10

Potential Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

Dormant Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

The following is sample output from the show mka sessions details command with secure announcement disabled.

Device# show mka sessions details

MKA Detailed Status for MKA Session
===================================
Status: SECURED - Secured MKA Session with MACsec

Local Tx-SCI............. 204c.9e85.ede4/002b
Interface MAC Address.... 204c.9e85.ede4
MKA Port Identifier...... 43
Interface Name........... GigabitEthernet1/0/1
Audit Session ID.........
CAK Name (CKN)........... 0100000000000000000000000000000000000000000000000000000000000000
Member Identifier (MI)... D46CBEC05D5D67594543CEAE
Message Number (MN)...... 89572
EAP Role................. NA
Key Server............... YES
MKA Cipher Suite......... AES-128-CMAC

Latest SAK Status........ Rx & Tx
Latest SAK AN............ 0
Latest SAK KI (KN)....... D46CBEC05D5D67594543CEAE00000001 (1)
Old SAK Status........... FIRST-SAK
Old SAK AN............... 0
Old SAK KI (KN).......... FIRST-SAK (0)

SAK Transmit Wait Time... 0s (Not waiting for any peers to respond)
SAK Retire Time.......... 0s (No Old SAK to retire)

MKA Policy Name.......... p2
Key Server Priority...... 2
Delay Protection......... NO
Replay Protection........ YES
Replay Window Size....... 0
Confidentiality Offset... 0
Algorithm Agility........ 80C201
Send Secure Announcement.. DISABLED
SAK Cipher Suite......... 0080C20001000001 (GCM-AES-128)
MACsec Capability........ 3 (MACsec Integrity, Confidentiality, & Offset)
MACsec Desired........... YES

# of MACsec Capable Live Peers............ 1
# of MACsec Capable Live Peers Responded.. 1

Live Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------
  38046BA37D7DA77E06D006A9  89560       c800.8459.e764/002a   10

Potential Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

Dormant Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

The following is sample output from the show mka policy policy-name detail command with secure announcement disabled.

Device# show mka policy p2 detail

MKA Policy Configuration ("p2")
========================
MKA Policy Name........ p2
Key Server Priority.... 2
Confidentiality Offset. 0
Send Secure Announcement..DISABLED
Cipher Suite(s)........ GCM-AES-128

Applied Interfaces...
  GigabitEthernet1/0/1

Example: Displaying MKA Information

The following is a sample output from the show mka sessions command:

Device# show mka sessions

Total MKA Sessions....... 1
      Secured Sessions... 1
      Pending Sessions... 0

====================================================================================================
Interface      Local-TxSCI         Policy-Name      Inherited         Key-Server
Port-ID        Peer-RxSCI          MACsec-Peers     Status            CKN
====================================================================================================
Gi1/0/1        204c.9e85.ede4/002b p2               NO                YES
43             c800.8459.e764/002a 1                Secured           0100000000000000000000000000000000000000000000000000000000000000

The following is a sample output from the show mka sessions interface interface-name command:

Device# show mka sessions interface GigabitEthernet 1/0/1

Summary of All Currently Active MKA Sessions on Interface GigabitEthernet1/0/1...

====================================================================================================
Interface      Local-TxSCI         Policy-Name      Inherited         Key-Server
Port-ID        Peer-RxSCI          MACsec-Peers     Status            CKN
====================================================================================================
Gi1/0/1        204c.9e85.ede4/002b p2               NO                YES
43             c800.8459.e764/002a 1                Secured           0100000000000000000000000000000000000000000000000000000000000000

The following is sample output from the show mka sessions interface interface-name detail command.

Device# show mka sessions interface GigabitEthernet 1/0/1 detail

MKA Detailed Status for MKA Session
===================================
Status: SECURED - Secured MKA Session with MACsec

Local Tx-SCI............. 204c.9e85.ede4/002b
Interface MAC Address.... 204c.9e85.ede4
MKA Port Identifier...... 43
Interface Name........... GigabitEthernet1/0/1
Audit Session ID.........
CAK Name (CKN)........... 0100000000000000000000000000000000000000000000000000000000000000
Member Identifier (MI)... D46CBEC05D5D67594543CEAE
Message Number (MN)...... 89567
EAP Role................. NA
Key Server............... YES
MKA Cipher Suite......... AES-128-CMAC

Latest SAK Status........ Rx & Tx
Latest SAK AN............ 0
Latest SAK KI (KN)....... D46CBEC05D5D67594543CEAE00000001 (1)
Old SAK Status........... FIRST-SAK
Old SAK AN............... 0
Old SAK KI (KN).......... FIRST-SAK (0)

SAK Transmit Wait Time... 0s (Not waiting for any peers to respond)
SAK Retire Time.......... 0s (No Old SAK to retire)

MKA Policy Name.......... p2
Key Server Priority...... 2
Delay Protection......... NO
Replay Protection........ YES
Replay Window Size....... 0
Confidentiality Offset... 0
Algorithm Agility........ 80C201
Send Secure Announcement.. DISABLED
SAK Cipher Suite......... 0080C20001000001 (GCM-AES-128)
MACsec Capability........ 3 (MACsec Integrity, Confidentiality, & Offset)
MACsec Desired........... YES

# of MACsec Capable Live Peers............ 1
# of MACsec Capable Live Peers Responded.. 1

Live Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------
  38046BA37D7DA77E06D006A9  89555       c800.8459.e764/002a   10

Potential Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

Dormant Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

The following is a sample output from the show mka sessions details command:

Device# show mka sessions details

MKA Detailed Status for MKA Session
===================================
Status: SECURED - Secured MKA Session with MACsec

Local Tx-SCI............. 204c.9e85.ede4/002b
Interface MAC Address.... 204c.9e85.ede4
MKA Port Identifier...... 43
Interface Name........... GigabitEthernet1/0/1
Audit Session ID.........
CAK Name (CKN)........... 0100000000000000000000000000000000000000000000000000000000000000
Member Identifier (MI)... D46CBEC05D5D67594543CEAE
Message Number (MN)...... 89572
EAP Role................. NA
Key Server............... YES
MKA Cipher Suite......... AES-128-CMAC

Latest SAK Status........ Rx & Tx
Latest SAK AN............ 0
Latest SAK KI (KN)....... D46CBEC05D5D67594543CEAE00000001 (1)
Old SAK Status........... FIRST-SAK
Old SAK AN............... 0
Old SAK KI (KN).......... FIRST-SAK (0)

SAK Transmit Wait Time... 0s (Not waiting for any peers to respond)
SAK Retire Time.......... 0s (No Old SAK to retire)

MKA Policy Name.......... p2
Key Server Priority...... 2
Delay Protection......... NO
Replay Protection........ YES
Replay Window Size....... 0
Confidentiality Offset... 0
Algorithm Agility........ 80C201
Send Secure Announcement.. DISABLED
SAK Cipher Suite......... 0080C20001000001 (GCM-AES-128)
MACsec Capability........ 3 (MACsec Integrity, Confidentiality, & Offset)
MACsec Desired........... YES

# of MACsec Capable Live Peers............ 1
# of MACsec Capable Live Peers Responded.. 1

Live Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------
  38046BA37D7DA77E06D006A9  89560       c800.8459.e764/002a   10

Potential Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

Dormant Peers List:
  MI                        MN          Rx-SCI (Peer)        KS Priority
  ----------------------------------------------------------------------

The following is a sample output from the show mka policy command:

Device# show mka policy

MKA Policy Summary...

Policy            KS       Delay   Replay  Window Conf   Cipher          Interfaces
Name              Priority Protect Protect Size   Offset Suite(s)        Applied
======================================================================================================
*DEFAULT POLICY*  0        FALSE   TRUE    0      0      GCM-AES-128

p1                1        FALSE   TRUE    0      0      GCM-AES-128

p2                2        FALSE   TRUE    0      0      GCM-AES-128     Gi1/0/1

The following is a sample output from the show mka policy policy-name command:

Device# show mka policy p2

MKA Policy Summary...

Policy            KS       Delay   Replay  Window Conf   Cipher          Interfaces
Name              Priority Protect Protect Size   Offset Suite(s)        Applied
======================================================================================================
p2                2        FALSE   TRUE    0      0      GCM-AES-128     Gi1/0/1

The following is a sample output from the show mka policy policy-name detail command:

Device# show mka policy p2 detail

MKA Policy Configuration ("p2")
========================
MKA Policy Name........ p2
Key Server Priority.... 2
Confidentiality Offset. 0
Send Secure Announcement..DISABLED
Cipher Suite(s)........ GCM-AES-128

Applied Interfaces...
  GigabitEthernet1/0/1

The following is a sample output from the show mka statistics interface interface-name command:

Device# show mka statistics interface GigabitEthernet 1/0/1

MKA Statistics for Session
==========================
Reauthentication Attempts.. 0

CA Statistics
   Pairwise CAKs Derived... 0
   Pairwise CAK Rekeys..... 0
   Group CAKs Generated.... 0
   Group CAKs Received..... 0

SA Statistics
   SAKs Generated.......... 1
   SAKs Rekeyed............ 0
   SAKs Received........... 0
   SAK Responses Received.. 1

MKPDU Statistics
   MKPDUs Validated & Rx... 89585
      "Distributed SAK".. 0
      "Distributed CAK".. 0
   MKPDUs Transmitted...... 89596
      "Distributed SAK".. 1
      "Distributed CAK".. 0

The following is a sample output from the show mka summary command:

Device# show mka summary

Total MKA Sessions....... 1
      Secured Sessions... 1
      Pending Sessions... 0

====================================================================================================
Interface      Local-TxSCI         Policy-Name      Inherited         Key-Server
Port-ID        Peer-RxSCI          MACsec-Peers     Status            CKN
====================================================================================================
Gi1/0/1        204c.9e85.ede4/002b p2               NO                YES
43             c800.8459.e764/002a 1                Secured           0100000000000000000000000000000000000000000000000000000000000000



MKA Global Statistics
=====================
MKA Session Totals
   Secured.................... 1
   Reauthentication Attempts.. 0

   Deleted (Secured).......... 0
   Keepalive Timeouts......... 0

CA Statistics
   Pairwise CAKs Derived...... 0
   Pairwise CAK Rekeys........ 0
   Group CAKs Generated....... 0
   Group CAKs Received........ 0

SA Statistics
   SAKs Generated............. 1
   SAKs Rekeyed............... 0
   SAKs Received.............. 0
   SAK Responses Received..... 1

MKPDU Statistics
   MKPDUs Validated & Rx...... 89589
      "Distributed SAK"..... 0
      "Distributed CAK"..... 0
   MKPDUs Transmitted......... 89600
      "Distributed SAK"..... 1
      "Distributed CAK"..... 0

MKA Error Counter Totals
========================
Session Failures
   Bring-up Failures................ 0
   Reauthentication Failures........ 0
   Duplicate Auth-Mgr Handle........ 0

SAK Failures
   SAK Generation................... 0
   Hash Key Generation.............. 0
   SAK Encryption/Wrap.............. 0
   SAK Decryption/Unwrap............ 0
   SAK Cipher Mismatch.............. 0

CA Failures
   Group CAK Generation............. 0
   Group CAK Encryption/Wrap........ 0
   Group CAK Decryption/Unwrap...... 0
   Pairwise CAK Derivation.......... 0
   CKN Derivation................... 0
   ICK Derivation................... 0
   KEK Derivation................... 0
   Invalid Peer MACsec Capability... 0
MACsec Failures
   Rx SC Creation................... 0
   Tx SC Creation................... 0
   Rx SA Installation............... 0
   Tx SA Installation............... 0

MKPDU Failures
   MKPDU Tx......................... 0
   MKPDU Rx Validation.............. 0
   MKPDU Rx Bad Peer MN............. 0
   MKPDU Rx Non-recent Peerlist MN.. 0

The following is a sample output from the show macsec interface command:

Device# show macsec interface HundredGigE 2/0/4

 MACsec is enabled
  Replay protect : enabled
  Replay window : 0
  Include SCI : yes
  Use ES Enable : no
  Use SCB Enable : no
  Admin Pt2Pt MAC : forceTrue(1)
  Pt2Pt MAC Operational : no
  Cipher : GCM-AES-128
  Confidentiality Offset : 0

 Capabilities
  ICV length : 16
  Data length change supported: yes
  Max. Rx SA : 16
  Max. Tx SA : 16
  Max. Rx SC : 8
  Max. Tx SC : 8
  Validate Frames : strict
  PN threshold notification support : Yes
  Ciphers supported : GCM-AES-128
                      GCM-AES-256
                      GCM-AES-XPN-128
                      GCM-AES-XPN-256

 Access control : must secure

 Transmit Secure Channels
  SCI : 3C5731BBB5850475
  SC state : inUse(1)
   Elapsed time : 7w0d
   Start time : 7w0d
   Current AN: 0
   Previous AN: -
   Next PN: 149757
   SA State: inUse(1)
   Confidentiality : yes
   SAK Unchanged : yes
   SA Create time : 00:04:41
   SA Start time : 7w0d
   SC Statistics
    Auth-only Pkts : 0
    Auth-only Bytes : 0
    Encrypted Pkts : 0
    Encrypted Bytes : 0
   SA Statistics
    Auth-only Pkts : 0
    Auth-only Bytes : 0
    Encrypted Pkts : 149756
    Encrypted Bytes : 16595088

  Port Statistics
   Egress untag pkts  0
   Egress long pkts  0

 Receive Secure Channels
  SCI : 3C5731BBB5C504DF
  SC state : inUse(1)
   Elapsed time : 7w0d
   Start time : 7w0d
   Current AN: 0
   Previous AN: -
   Next PN: 149786
   RX SA Count: 0
   SA State: inUse(1)
   SAK Unchanged : yes
   SA Create time : 00:04:39
   SA Start time : 7w0d
   SC Statistics
    Notvalid pkts 0
    Invalid pkts 0
    Valid pkts 0
    Late pkts 0
    Uncheck pkts 0
    Delay pkts 0
    UnusedSA pkts 0
    NousingSA pkts 0
    Validated Bytes 0
    Decrypted Bytes 0
   SA Statistics
    Notvalid pkts 0
    Invalid pkts 0
    Valid pkts 149784
    Late pkts 0
    Uncheck pkts 0
    Delay pkts 0
    UnusedSA pkts 0
    NousingSA pkts 0
    Validated Bytes 0
    Decrypted Bytes 16654544

  Port Statistics
   Ingress untag pkts  0
   Ingress notag pkts  631726
   Ingress badtag pkts  0
   Ingress unknownSCI pkts  0
   Ingress noSCI pkts  0
   Ingress overrun pkts  0

Additional References for MACsec Encryption

Standards and RFCs


Standard/RFC	Title
IEEE 802.1AE-2006	Media Access Control (MAC) Security
IEEE 802.1X-2010	Port-Based Network Access Control
IEEE 802.1AEbw-2013	Media Access Control (MAC) Security (Amendment to IEEE 802.1AE-2006)—Extended Packet Numbering (XPN)
IEEE 802.1Xbx-2014	Port-Based Network Access Control (Amendment to IEEE 802.1X-2010)
RFC 4493	The AES-CMAC Algorithm

Technical Assistance


Description	Link
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.	http://www.cisco.com/support

Feature History for MACsec Encryption

This table provides release and related information for the features explained in this module.

These features are available in all the releases subsequent to the one they were introduced in, unless noted otherwise.


Release	Feature	Feature Information
Cisco IOS XE Fuji 16.9.1	MACsec Encryption	MACsec is the IEEE 802.1AE standard for authenticating and encrypting packets between two MACsec-capable devices.
Cisco IOS XE Amsterdam 17.3.x	MACSec Support with Cisco StackWise Virtual	Support was introduced for MKA MACSec and SAP MACSec switch-to-switch connections on line cards when Cisco StackWise Virtual is configured on the device.
Cisco IOS XE Cupertino 17.8.1	MACsec Fallback Key Support	The MACsec Fallback Key feature establishes an MKA session with the pre-shared fallback key whenever the PSK fails to establish a session because of key mismatch.
Cisco IOS XE Cupertino 17.9.1	MACsec Encryption	This feature was implemented on C9200CX-12P-2X2G, C9200CX-8P-2X2G, and C9200CX-12T-2X2G models of the Cisco Catalyst 9200CX Series Switches, which were introduced in this release.

Use the Cisco Feature Navigator to find information about platform and software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn.

Security Configuration Guide, Cisco IOS XE Cupertino 17.9.x (Catalyst 9200 Switches)

Bias-Free Language

Results

Chapter: Configuring MACsec Encryption

Configuring MACsec Encryption

Prerequisites for MACsec Encryption

Prerequisites for MACsec Encryption

Prerequisites for Certificate-Based MACsec

Restrictions for MACsec Encryption

Information About MACsec Encryption

Recommendations for MACsec Encryption

MACsec Encryption Overview

Media Access Control Security and MACsec Key Agreement

MKA Policies

Definition of Policy-Map Actions

Virtual Ports

MKA Statistics

Key Lifetime and Hitless Key Rollover

Fallback Key

Replay Protection Window Size

MACsec, MKA, and 802.1x Host Modes

Single-Host Mode

Multiple Host Mode

Multiple-Domain Mode

MACsec MKA using Certificate-based MACsec

Prerequisites for MACsec MKA using Certificate-based MACsec

MACsec Connection Across Intermediate Switches

Limitations for MACsec Connections Across Intermediate Switches

Switch-to-Switch MKA MACsec Must Secure Policy

MKA/MACsec for Port Channel

MACsec Cipher Announcement

How to Configure MACsec Encryption

Configuring MKA and MACsec

Configuring an MKA Policy

Procedure

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Configuring Switch-to-host MACsec Encryption

Procedure

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Configuring MACsec MKA using PSK

Procedure

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Example:

Configuring MACsec MKA on an Interface using PSK

Procedure

Example:

Example: