provides security improvements to Cisco network devices based on the capability
to strongly identify users, hosts, and network devices within a network.
TrustSec provides topology-independent and scalable access controls by uniquely
classifying data traffic for a particular role. TrustSec ensures data
confidentiality and integrity by establishing trust among authenticated peers
and encrypting links with those peers.
The key component of
Cisco TrustSec is the Cisco Identity Services Engine (ISE). Cisco ISE can
provision switches with TrustSec Identities and Security Group ACLs (SGACLs),
though these may be configured manually on the switch.
To configure Cisco
Trustsec on the switch, see the Cisco TrustSec Switch Configuration Guide at
the following URL:
The table below lists
the TrustSec features to be eventually implemented on TrustSec-enabled Cisco
switches. Successive general availability releases of TrustSec will expand the
number of switches supported and the number of TrustSec features supported per
Cisco TrustSec Feature
802.1AE Tagging (MACsec)
IEEE 802.1AE-based wire-rate hop-to-hop Layer 2 encryption.
MACsec-capable devices, packets are encrypted on egress from the transmitting
device, decrypted on ingress to the receiving device, and in the clear within
feature is only available between TrustSec hardware-capable devices.
Endpoint Admission Control (EAC)
EAC is an
authentication process for an endpoint user or a device connecting to the
TrustSec domain. Usually EAC takes place at the access level switch. Successful
authentication and authorization in the EAC process results in Security Group
Tag assignment for the user or device. Currently EAC can be 802.1X, MAC
Authentication Bypass (MAB), and Web Authentication Proxy (WebAuth).
Network Device Admission Control (NDAC)
NDAC is an
authentication process where each network device in the TrustSec domain can
verify the credentials and trustworthiness of its peer device. NDAC utilizes an
authentication framework based on IEEE 802.1X port-based authentication and
uses EAP-FAST as its EAP method. Successful authentication and authorization in
NDAC process results in Security Association Protocol negotiation for IEEE
Security Group Access Control List (SGACL)
Group Access Control List (SGACL) associates a Security Group Tag with a
policy. The policy is enforced upon SGT-tagged traffic egressing the TrustSec
Security Association Protocol (SAP)
authentication, the Security Association Protocol (SAP) automatically
negotiates keys and the cipher suite for subsequent MACSec link encryption
between TrustSec peers. SAP is defined in IEEE 802.11i.
Security Group Tag (SGT)
An SGT is a
16-bit single label indicating the security classification of a source in the
TrustSec domain. It is appended to an Ethernet frame or an IP packet.
Group Tag Exchange Protocol (SXP). With SXP, devices that are not
TrustSec-hardware-capable can receive SGT attributes for authenticated users
and devices from the Cisco Identity Services Engine (ISE) or the Cisco Secure
Access Control System (ACS). The devices can then forward a sourceIP-to-SGT
binding to a TrustSec-hardware-capable device will tag the source traffic for
When both ends of a
link support 802.1AE MACsec, SAP negotiation occurs. An EAPOL-key exchange
occurs between the supplicant and the authenticator to negotiate a ipher suite,
exchange security parameters, and manage keys. Successful completion of these
tasks results in the establishment of a security association (SA).
Depending on your
software version and licensing and link hardware support, SAP negotiation can
use one of these modes of operation:
Galois Counter Mode
(GCM)—authentication and encryption
GCM authentication (GMAC)—
GCM authentication, no encryption
encapsulation (clear text)
authentication or encryption
for Cisco TrustSec
Table 1 Feature
Information for Cisco TrustSec
Interface to SGT
and VLAN to SGT mapping.
Subnet to SGT
Layer 3 Port Mapping
Layer 3 Identity
Port Mapping (IPM)
Security Group Name
SXP Loop Detection
were introduced on the Catalyst 3850 and 3650 switches and the Cisco 5700
Series Wireless LAN Controllers.