Inter-AS E2E SR-MPLS TE
Service Overview
The future network is oriented to the 5G era. Bearer networks also need to adapt to the trend by simplifying networks, providing low latency, and implementing software-defined networking (SDN) and network functions virtualization (NFV). E2E SR-MPLS TE can carry VPN services through a complete inter-AS tunnel, which greatly reduces networking and O&M costs and meets carriers' unified O&M requirements.
Networking Description
Figure 2-109 illustrates the typical application of the inter-AS E2E SR-MPLS TE technology on a bearer network. The overall service model is EVPN over SR-MPLS TE. An E2E SR-MPLS TE tunnel is used for unified transmission. The data service model is EVPN. The network is oriented to 5G and has the features of simplified solution, protocol, and tunnel, and unified reliability solution. It works with the network controller to quickly respond to upper-layer service requirements.
Feature Deployment
Configure IGP SR within an AS domain to establish an intra-AS SR-MPLS TE tunnel and BGP EPE between AS domains to assign inter-AS SIDs. Binding SIDs are used to combine SR-MPLS TE tunnels in multiple AS domains into an inter-AS E2E SR-MPLS TE tunnel.
EVPN is deployed to carry various services, including EVPN VPWS, EVPN VPLS, and EVPN L3VPN. In addition to EVPN, the traditional BGP L3VPN can be smoothly switched to the E2E SR-MPLS TE tunnel.
In terms of reliability, intra-AS SR-MPLS TE tunnels are monitored by BFD or SBFD. TE hot standby (HSB) technology switches traffic between the primary and HSB TE LSPs. Inter-AS E2E SR-MPLS TE tunnels are monitored by one-arm BFD. TE HSB is used to switch traffic between the primary and HSB TE LSPs. VPN FRR is used to switch traffic between the primary and HSB E2E SR-MPLS TE tunnels.
