Deployment Guide

18 ScaleIO/VxFlex OS IP Fabric Best Practice and Deployment Guide with OS10EE | version 1.0
3.2.6 ECMP
ECMP is the core protocol facilitating the deployment of a layer 3 leaf-spine topology. ECMP gives each spine
and leaf switch the ability to load balance flows across a set of equal next-hops. For example, when using two
spine switches, each leaf has a connection to each spine. For every flow egressing a leaf switch, there exists
two equal next-hops, one to each spine.
ECMP
3.2.7 VRRP
A VRRP instance is created for each VLAN/network in Table 4. As illustrated in Figure 9 below, Node 1
participates in the vMotion VLAN 32 broadcast domain. The host’s configuration sends traffic for
172.17.32.0/24 to the Virtual IP (VIP) 172.17.32.253 provided by the VRRP instance running between leaf
switches 1A and 1B.
VRRP example
3.2.8 Flow control
The sample deployment in this document utilizes the Dell EMC S4248FB-ON network switch which provides
deep buffers for egress traffic. Dell EMC recommends the use of flow control on the host interfaces to fully
utilize this feature to minimize packet drops due to incasts or host network congestion. Flow control is
enabled on ESXi by default but receive flow control must be enabled on the network switch interfaces.