25-Segment Routing Configuration Guide

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04-SRv6 VPN overview
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SRv6 VPN overview

SRv6 VPN uses SRv6 tunnels to carry VPN services over an IPv6 network. This VPN technology uses MP-BGP to advertise VPN routing information on the control plane and uses SRv6 encapsulation on the data plane. SRv6 VPN can provide Layer 3 connectivity for geographically dispersed sites of a tenant based on the existing service provider or enterprise IP network.

SRv6 VPN solutions

SRv6 VPN supports only L3VPN solutions, including IP L3VPN over SRv6 and EVPN L3VPN over SRv6.

IP L3VPN over SRv6

This solution advertises IPv4 or IPv6 VPN routes to remote sites over the IPv6 backbone network and transmits IPv4 or IPv6 VPN traffic in SRv6 encapsulation to the remote sites.

Figure 1 shows a typical MPLS L3VPN over SRv6 network.

·     PE 1 and PE 2 use MP-BGP to advertise IPv4 or IPv6 VPN routes to each other over the IPv6 backbone network. The VPN routes contain private network routing information and SID information.

·     The PEs have a single-hop SRv6 tunnel between them and they use the SRv6 tunnel to forward VPN traffic across sites.

·     The devices in the IPv6 backbone network forward the SRv6-encapsulated VPN traffic through the optimal path calculated by IGP.

MPLS L3VPN over SRv6 connects geographically dispersed sites that belong to the same VPN over the IPv6 backbone network.

Figure 1 Network diagram

EVPN L3VPN over SRv6

This solution advertises IPv4 or IPv6 BGP EVPN routes to remote sites over the IPv6 backbone network and transmits EVPN L3VPN traffic in SRv6 encapsulation to the remote sites.

Figure 2 shows a typical EVPN L3VPN over SRv6 network.

·     PE 1 and PE 2 use MP-BGP to advertise EVPN IP advertisement routes to each other over the IPv6 backbone network. The EVPN IP advertisement routes contain IPv4 or IPv6 VPN routing information and SID information.

·     The PEs have a single-hop SRv6 tunnel between them and they use the SRv6 tunnel to forward EVPN L3VPN traffic across sites.

·     The devices in the IPv6 backbone network forward the SRv6-encapsulated EVPN L3VPN traffic through the optimal path calculated by IGP.

EVPN L3VPN over SRv6 connects geographically dispersed sites that belong to the same VPN over the IPv6 backbone network.

Figure 2 Network diagram