Now you can also download my VXLAN book from the Leanpub.com
"Virtual Extensible LAN VXLAN - A Practical guide to VXLAN Solution Part 1. (373 pages)
BGP as an Underlay Network Routing Protocol
"Virtual Extensible LAN VXLAN - A Practical guide to VXLAN Solution Part 1. (373 pages)
BGP as an Underlay Network Routing Protocol
Using BGP instead of OSPF or IS-IS for Underlay Network routing in BGP VXLAN fabric simplifies the Control Plane operation because there is only one routing protocol running on fabric switches. However, there are some tradeoffs too. The BGP only solution requires at least two BGP Address-Families (afi) per switch, one for the Underlay (IPv4 Unicast) and one for the Overlay (L2VPN EVPN). In addition, if Border Leaf switches are connected to MPLS network, there is a third BGP afi for VPNv4. In some cases, multi-afi BGP makes troubleshooting a bit more complex compared to a single-afi solution where BGP is used only in Overlay Network. The focus of this chapter is VXLAN fabric Underlay Network with iBGP routing.
Figure 1-1: High-Level operation of VXLAN Fabric
