Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Understanding MACsec Benefits


MACsec is an industry-standard security technology that provides secure communication for all traffic on Ethernet links. MACsec provides point-to-point security on Ethernet links between directly connected nodes and is capable of identifying and preventing most security threats, including denial of service, intrusion, man-in-the-middle, masquerading, passive wiretapping, and playback attacks. MACsec is standardized in IEEE 802.1AE.

MACsec allows you to secure an Ethernet link for almost all traffic, including frames from the Link Layer Discovery Protocol (LLDP), Link Aggregation Control Protocol (LACP), Dynamic Host Configuration Protocol (DHCP), Address Resolution Protocol (ARP), and other protocols that are not typically secured on an Ethernet link because of limitations with other security solutions. MACsec can be used in combination with other security protocols such as IP Security (IPsec) and Secure Sockets Layer (SSL) to provide end-to-end network security.

When MACsec is enabled, an 8-byte header and a 16-byte tail are appended to all Ethernet frames traversing the MACsec-secured link. The header and tail are checked by the receiving interface to ensure that the data was not compromised while traversing the link. If the data integrity check detects anything irregular about the traffic, the traffic is dropped.

MACsec can also be used to encrypt traffic on the Ethernet link. The encryption used by MACsec ensures that the data in the Ethernet frame cannot be viewed by anybody monitoring traffic on the link. MACsec encryption is optional and user-configurable; you can enable MACsec to ensure the data integrity checks are performed while still sending unencrypted data “in the clear” over the MACsec-secured link, if desired.

MACsec provides industry-standard security for Layer 2 traffic and is useful in any scenario where sensitive Layer 2 traffic needs to be sent across the network securely.