Note This section is applicable only for Cisco Catalyst 9000 Series Switches beginning from Cisco IOS XE 16.8.x release. SGT Inline Tagging on a NAT Enabled Device L2 Inline Tagging is supported for IPv6 multicast traffic with unicast source IPv6 addresses. An IP address to SGT table can also be populated by the SXP protocol.

SGT lookup based on source IP address: In some cases, the administrator may manually configure a policy to decide the SGT of a packet based upon the source IP address. This situation applies to a network that is not the first network device in the Cisco TrustSec cloud for the packet.

SGT field on Cisco TrustSec header: If a packet is coming from a trusted peer device, it is assumed that the Cisco TrustSec header carries the correct SGT field. The SGT of a packet can be determined with these methods: When IPsec support is added, the received SGT tag is shared with IPSec for SGT tagging.Ī network device at the ingress of Cisco TrustSec cloud needs to determine the SGT of the packet entering the Cisco TrustSec cloud so that it can tag the packet with that SGT when it forwards it into the Cisco TrustSec cloud. The SGT tag received in a packet from a trusted interface is propagated to the network, and is also be used for Identity firewall classification. From the view of any given packet, SGACL is simply being sourced from a security group and destined for another security group. With Cisco TrustSec, access control policies are defined between the security groups and are referred to as Security Group Access Control Lists (SGACL).

At this point, access control can be applied. At the egress edge of the network, the group assigned to the packet's destination becomes known. When a packet enters a Cisco TrustSec-enabled interface, the IP-SGT mapping database (with dynamic entries built by SXP and/or static entries built by configuration commands) is analyzed to learn the SGT corresponding to the source IP address of the packet, which is then inserted into the packet and carried throughout the network within the Cisco TrustSec header.Īs the tag represents the group of the source, the tag is also referred to as the Source Group Tag (SGT). The Cisco TrustSec with SGT Exchange Protocol V4 (SXPv4) feature supports Cisco TrustSec metadata-based L2-SGT. The inline identity propagation is scalable, provides near line-rate performance and avoids control plane overhead. SGT-over-Ethernet is a method of hop-by-hop propagation of SGT embedded in clear-text (unencrypted) Ethernet packets. It allows Ethernet interfaces on the device to be enabled for L2-SGT imposition so that the device can insert an SGT in the packet to be carried to its next hop Ethernet neighbor. This feature is called Layer 2(L2)-SGT Imposition.

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It is in turn propagated between network hops allowing any intermediary devices (switches, routers) to enforce polices based on the identity tag.Ĭisco TrustSec-capable devices have built-in hardware capabilities than can send and receive packets with SGT embedded in the MAC (L2) layer. The SGT is a single label indicating the privileges of the source within the entire network. Information About SGT Inline Tagging Overview of SGT Inline TaggingĮach security group in a Cisco TrustSec domain is assigned a unique 16 bit tag called the Security Group Tag (SGT).

Feature Information for SGT Inline Tagging.

Configuration Examples for SGT Inline Tagging.

This section includes the following topics: