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Single-AS SR-MPLS TE
Single-AS Strict Explicit Path
In Figure 2-107, labels are assigned on the device side. An IGP extension supports SR to advertise label information. BGP-LS collects network topology and label information. On each forwarder, a strict explicit path is manually configured to establish an SR-MPLS TE tunnel, and the tunnel is delegated to the controller. The controller runs PCEP delivers label stack information to instruct forwarders to forward data.
Single-AS Loose Explicit Path
In Figure 2-108, labels are assigned on the device side. An IGP extension supports SR to advertise label information. BGP-LS collects network topology and label information and sends the information to the controller. The controller computes a path for an SR tunnel and runs NETCONF to deliver label stack information to forwarders to forward data.
An L3VPN within the network carries DCI services in per tenant per VPN mode. Within a data center (DC), tenants are isolated, and the DC gateway accesses the L3VPN through a VLAN sub-interface. Tenant VPNs are carried over the primary and backup SR tunnels.
