Deployment Guide

15 ScaleIO/VxFlex OS IP Fabric Best Practice and Deployment Guide with OS10EE | version 1.0
The commands within each configuration file can be modified to apply to the reader’s network. Network
interfaces, VLANs, and IP schemes can be easily changed and adapted using a text editor. Once modified,
copy/paste the commands directly into the switch CLI of the appropriate switch.
The following subsections provide information to assist in the deployment examples detailed in this guide.
3.2.1 BGP ASN configuration
BGP has a reserved, private, two-byte Autonomous System Number (ASN) ranging from 64,512 to 65,535.
Each switch is assigned a separate ASN. Figure 5 below shows an example of ASN numbering. The
deployment steps use the ASN numbers in Table 2.
BGP ASN assignments
3.2.2 BGP neighbor fall-over
BGP tracks IP reachability to the peer remote address and the peer local address. If either becomes
unreachable (for example, no active route exists in the routing table for the peer IPv4 destination/local
address), BGP brings down the session with the peer. This feature is called neighbor fall-over. Dell EMC
recommends enabling neighbor fall-over for EBGP settings.
3.2.3 Loopback addresses
Figure 6 shows part of the created topology. This figure shows the point-to-point IP address and loopback
addresses for switches in the topology. All of the point-to-point addresses come from the same base IP prefix,
192.168.0.0/16. The third octet represents the appropriate topology layer, 1 for spine (top of Leaf-Spine
topology) and 2 for leaf (bottom of Leaf-Spine topology). All loopback addresses are part of the 10.0.0.0/8
address space in this example with each switch using a 32-bit mask. This address scheme helps with
establishing BGP neighbor adjacencies, as well as troubleshooting connectivity.
As illustrated, scaling horizontally requires following the IP scheme below, depending on whether the device
is a spine or leaf switch.