MACsec key management modes

The following table describes the main key management modes in MACsec.

Table 1. MACsec key management modes
Keying Description 7705 SAR support Where used

Static SAK

Manually configures each node with a static security association key (SAK), SAM, or CLI

Switch to switch

Static CAK PRE SHARED KEY

Uses a dynamic MACsec key agreement (MKA) and a configured pre-shared key to drive the connectivity association key (CAK)

The CAK encrypts the SAK between two peers and authenticates the peers.

Switch to switch

Dynamic CAK EAP authentication

Uses a dynamic MKA and an EAP master system key (MSK) to drive the CAK

The CAK encrypts the SAK between two peers and authenticates the peers.

Switch to switch

Dynamic CAK MSK distribution via RADIUS and EAP-TLS

Stores the MSKs in the RADIUS server and distributes to the hosts via EAP-TLS. This is typically used in access networks where a large number of hosts use MACsec and connect to an access switch.

MKA uses MSK to drive the CAK. The CAK encrypts the SAK between two peers and authenticates the peers.

Host to switch