Deployment Guide

20 Leaf-Spine Deployment and Best Practices Guide | Version 1.0
7 Example 1: Layer 3 with Dell EMC leaf and spine switches
This section provides BGP and OSPF configuration examples to build the layer 3 leaf-spine topology shown
in Figure 14. Dell EMC Networking S4048-ON switches are used at the leaf layer and Dell EMC Networking
Z9100-ON switches are used at the spine layer.
Note: The BGP ASNs and IP addresses defined in Section 6 are used here.
Rack 2Rack 1
S4048-Leaf4
Z9100-Spine1 Z9100-Spine2
S4048-Leaf3
VLT i
S4048-Leaf2
S4048-Leaf1
VLT i
Server 2
Server 1
L3 Connection
L2 Connection
ECMP
Fo 1/1/1- Fo 1/4/1
Fo 1/53-54Fo 1/53-54
Te 1/4Te 1/4
Te 1/48
Te 1/48
Po 1
Po 1
Fo 1/1/1- Fo 1/4/1
All leaf switch uplinks
Fo 1/49 - Fo 1/50
IP Address 10.60.1.7/24
Gateway 10.60.1.1
Leaf 3
VLAN 60:
10.60.1.1/24
Leaf 4
VLAN 60:
10.60.1.2/24
IP Address 172.16.1.7/24
Gateway 172.16.1.1
Leaf 1
VLAN 50:
172.16.1.1/24
Leaf 2
VLAN 50:
172.16.1.2/24
Example 1: Layer 3 leaf-spine topology with Dell EMC leaf and spine switches
In this topology, there is one broadcast domain in each rack.
In Rack 1, VLAN 50 is used and devices in VLAN 50 are assigned IP addresses on the 172.16.1.0/24
network. With VLT peer routing enabled on S4048-Leaf1 and S4048-Leaf2, Server 1 may specify the IP
address assigned to VLAN 50 on either leaf, 172.16.1.1 or 172.16.1.2, as its default gateway. Traffic is load
balanced across both leafs.
Rack 2 is configured in an identical manner, except VLAN 60 is used and devices in VLAN 60 are assigned IP
addresses on the 10.60.1.0/24 network. Server 2 may specify the VLAN 60 IP address of either leaf,
10.60.1.1 or 10.60.1.2, as its default gateway.