During the configuration of L3VPNv4 over SRv6 BE, if an RR is deployed in the...

Understanding L3VPNv4 Over SRv6 BE

????What is L3VPNv4?

L3VPNv4 (Layer 3 VPN over IPv4) allowsMPLS-based VPN servicesover anSRv6 backbone.

UsesMP-BGP (Multiprotocol BGP)to distribute VPN routes.

????Why is an RR (Route Reflector) Needed?

AnRR simplifies BGP route exchangebetween multiple PEs (Provider Edge routers).

Without proper configuration, RRs may filter VPNv4 routes, preventing PEs from learning routes correctly.

Why is the Command peer retain-route-target all Needed?

✅Ensures that the RR retains all VPNv4 routes.

✅Prevents the RR from filtering route targets (RTs), allowing full VPN reachability.

✅Without this command, the RR might not reflect all VPNv4 routes, causing connectivity issues.

Real-World Application:

Enterprise MPLS VPNs:Ensurescorrect BGP route reflection in an SRv6-based L3VPN.

Carrier Networks:Helpsservice providers maintain full BGP VPN route distribution.

✅Reference:Huawei HCIE-Datacom Guide – BGP Route Reflectors in L3VPN over SRv6