Deployment Guide

18 Leaf-Spine Deployment and Best Practices Guide | Version 1.0
Rack 2
Rack 1
10.0.1.1/32 10.0.1.2/32
VLT i
VLT i
10.0.2.1/32
10.0.2.2/32
10.0.2.3/32
10.0.2.4/32
Loopback addressing
All loopback addresses used are part of the 10.0.0.0/8 address space with each address using a 32-bit mask.
In this example, the third octet represents the layer, “1” for spine and “2” for leaf. The fourth octet is the
counter for the appropriate layer. For example, 10.0.1.1/32 is the first spine switch in the topology while
10.0.2.4/32 is the fourth leaf switch.
6.2.2 Point-to-point addresses
Table 1 lists layer 3 connection details for each leaf and spine switch.
All addresses come from the same base IP prefix, 192.168.0.0/16 with the third octet representing the spine
number. For example, 192.168.1.0/31 is a two host subnet connected to Spine 1 while 192.168.2.0/31 is
connected to Spine 2. This IP scheme is easily extended as leaf and spine switches are added to the
network.
Link labels are provided in the table for quick reference with Figure 13.
Interface and IP configuration
Link
Label
Source
switch
Source
interface
Source
IP
Network
Destination
switch
Destination
interface
Destination
IP
A
Leaf 1
fo1/49
.1
192.168.1.0/31
Spine 1
fo1/1/1
.0
B
Leaf 1
fo1/50
.1
192.168.2.0/31
Spine 2
fo1/1/1
.0
C
Leaf 2
fo1/49
.3
192.168.1.2/31
Spine 1
fo1/2/1
.2
D
Leaf 2
fo1/50
.3
192.168.2.2/31
Spine 2
fo1/2/1
.2
E
Leaf 3
fo1/49
.5
192.168.1.4/31
Spine 1
fo1/3/1
.4
F
Leaf 3
fo1/50
.5
192.168.2.4/31
Spine 2
fo1/3/1
.4
G
Leaf 4
fo1/49
.7
192.168.1.6/31
Spine 1
fo1/4/1
.6
H
Leaf 4
fo1/50
.7
192.168.2.6/31
Spine 2
fo1/4/1
.6