MPLS L3VPN on Cisco IOS-XE: Building and Verifying Multi-Site VPNs from Scratch
New post on ignaonline.com — this one digs deep into MPLS Layer 3 VPNs on Cisco IOS-XE.
If you've ever managed a service provider network or enterprise WAN and needed to understand how customer traffic stays isolated across a shared MPLS core, this guide walks through the full build from scratch — VRF config, LDP adjacencies, MP-BGP VPNv4 peering between PEs, and eBGP PE-CE routing — with real CLI output and show command verification at every step.
Topics covered:
- P / PE / CE roles and the VRF/RD/RT model
- OSPF in the provider core + LDP setup
- MP-BGP VPNv4 address family and the
send-community bothgotcha - PE-CE eBGP with
as-override - End-to-end verification with
show bgp vpnv4 unicast all - Systematic troubleshooting by layer
- Route Reflectors and Inter-AS scaling
— Sarah Chen, ignaonline.com
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