Dell Z9264F-ON EMC Networking Virtualization Overlay with BGP EVPN - Page 13
BGP ASNs and router IDs, Point-to-point IP networks
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4.1.1 BGP ASNs and router IDs Figure 9 shows the autonomous system numbers (ASNs) and router IDs used for the leaf and spine switches in this guide. Spine switches share a common ASN and each pair of leaf switches shares a common ASN. ASNs should follow a logical pattern for ease of administration and allow for growth as switches are added. Using private ASNs in the data center is a best practice. Private, 2-byte ASNs range from 64512 through 65534. In this example, 65101 is used on both switches at the spine layer. Leaf switches use ASNs with a "2" in the hundreds place, 65201 for example, and the last digit is used to uniquely identify the leaf pair. Additional spine switches would be assigned the existing ASN for the spine layer, 65101. Additional leaf switches would be added in pairs with the next pair assigned an ASN of 65204. The IP addresses shown are loopback addresses used as BGP router IDs and for BGP EVPN peering. Loopback addresses should follow a logical pattern to make it easier to manage and allow for growth. In this example, the 10.2.0.0/16 IP address space is used. The third octet in the address represents the layer, "1" for spine and "2" for leaf, and the fourth octet is the counter for the appropriate layer AS 65101 1S0p.i2n.e1.11 1S0p.2in.1e.2 4.1.2 10.2.2.1 VLTi 10.2.2.2 AS65201 10.2.2.3 VLTi 10.2.2.4 AS65202 BGP ASNs and router IDs 10.2.2.5 VLTi 10.2.2.6 AS65203 Point-to-point IP networks Establishing a logical, scalable IP address scheme is important before deploying a leaf-spine topology. The point-to-point links used in this deployment are labeled A-O in Figure 10. Spine 1 SSppiinnee22 A B C DE FG HI Leaf 1a VMLTi Leaf 1b Rack 1 Point-to-point networks Leaf 2a VNLTi Leaf 2b Rack 2 JK L Leaf 3a VOLTi Leaf 3b Rack n 13 Dell EMC Networking Virtualization Overlay with BGP EVPN