Deployment Guide

36 VxFlex Network Deployment Guide using Dell EMC Networking 25GbE switches and OS9
ScaleIO-172-16-33-12:~ # service network restart
Shutting down network interfaces:
eth0 device: VMware VMXNET3 Ethernet Controller done
eth1 device: VMware VMXNET3 Ethernet Controller done
Eth2 device: VMware VMXNET3 Ethernet Controller done
Shutting down service network . . . . . . . . . done
Hint: you may set mandatory devices in /etc/sysconfig/network/config
Setting up network interfaces:
eth0 device: VMware VMXNET3 Ethernet Controller
eth0 IP address: 172.16.33.12/24 done
eth1 device: VMware VMXNET3 Ethernet Controller
eth1 IP address: 172.16.34.12/24 done
eth2 device: VMware VMXNET3 Ethernet Controller
eth2 IP address: 172.16.35.12/24 done
Setting up service network . . . . . . . . . . done
7. Use the ping command to validate jumbo frames connectivity to another, already-configured, SVM:
ScaleIO-172-16-33-12:~ # ping -M do -s 8972 172.16.31.13
PING 172.16.34.13 (172.16.34.13) 8972(9000) bytes of data.
8980 bytes from 172.16.34.13: icmp_seq=1 ttl=64 time=0.393 ms
8980 bytes from 172.16.34.13: icmp_seq=2 ttl=64 time=0.398 ms
8980 bytes from 172.16.34.13: icmp_seq=3 ttl=64 time=0.366 ms
7.2 Configure Quality of Service using Differentiated Services (DiffServ)
The basis of Quality of Service (QoS) is traffic differentiation. In this guide, different types of traffic are
classified accordingly and then are given priorities throughout the network using DiffServ. The priorities are
marked using Differentiated Services Code Point (DSCP). Once marking is complete, QoS tools are applied
to each specific traffic type to affect traffic behavior. DiffServ operates independently on each router in a
standalone model, meaning that each router can use the classification to affect traffic behavior differently.
Traffic is separated into two broad categories and marked using DSCP markings based on what the network
needs to provide for that type of traffic:
1. Traffic with higher priority requirements is given a DSCP mark of 46
2. Traffic with lower priority requirements are not marked
VxFlex has native QoS capabilities that are not demonstrated in this paper. For instance, the amount of traffic
the SDC generates can be limited per volume with a high level of granular control. For more information, see
the VxFlex OS v2.x Deployment Guide.
A DSCP value of 46 corresponds to expedited forwarding and maps to queue 5 on the S5048F-ON switch.
These actions ensure that the switch prioritizes this type of traffic above unmarked traffic that uses the default
queue 0. In this deployment guide, both the physical and virtual networks are configured to classify traffic. The
VDS is configured to initially insert the DSCP value while the physical switches are configured to trust the
default DSCP value mapping.
In the switch configuration section, a policy map is created and instructs both switches to trust the DSCP
value mapping. The configuration below shows the commands set to trust DSCP value mapping for the
S5048F-ON switch. Configuration for the second leaf switch is identical.