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1. Technical Forum
Solutions for Scaling the Cloud Computing Network
Infrastructure
Autumn 2015

2. Technical Forum
Overlay Networking:Your Choice with Arista
SDN Controller Integration
Physical
infrastructure
Hardware VTEP added
to the logical switch
vSwitch
Software
VTEP
on host
Direct Integration
Tenant VLAN
creation on
compute node
link
Physical infrastructure
(Create VLAN on leaf node ->
static map to VNI )
MAC Distribution
Dynamic Flood-list create
Tenant Network
Virtual Machine creation
Network
Virtualization
Controller
CloudVision
eXchange
CloudVision
eXchange
Abstraction
Layer
Cloud Management Platform Cloud Management Platform

3. Technical Forum
Overlay
Controller
Scaling Controller Integration
3
OVSDB/eAPI
Overlay
Controller
Network Layer
Controller Layer
10x
Improvement
OVSDB/eAPI
Sysdb
State Sync
Topology/Device
Dependent
Topology/Device
Abstraction
Traditional
Approach
CloudVision
Approach
© 2015 Arista - Confidential
Highly Optimized
State Sync Protocol

4. Technical Forum
Topology-dependent config:Neutron ML2 example
[ml2_mech_vendor:1.1.1.1]
host1-port-channel:2
ssh_port=22
username=admin
password=myPass
[ml2_mech_vendor:1.1.1.2]
host1-port-channel:2
ssh_port=22
username=admin
password=myPass
[ml2_mech_vendor:1.1.1.1]
host1-port-channel:2
ssh_port=22
username=admin
password=myPass
[ml2_mech_vendor:1.1.1.2]
host1-port-channel:2
ssh_port=22
username=admin
password=myPass
[ml2_mech_vendor:1.1.1.3]
host1-port-channel:2
ssh_port=22
username=admin
password=myPass
Adding a new switch
requires configuration
changes in ml2:

5. Technical Forum
Use Case 1: OpenStack with ML2

6. Technical Forum
OpenStack ML2 Plugin – CVX via eAPI
OpenStack
Direct Integration
Tenant VLAN
creation on
compute node
link
Physical infrastructure
(Create VLAN on leaf node ->
static map to VNI )
MAC Distribution
Dynamic Flood-list create
Tenant Network
Virtual Machine creation
Cloud ManagementPlatform
(Neutron ML2 plugin)
CloudVision
eXchange
• Network topology abstraction via
CVX
• Provides Hypervisor Infrastructure
with VXLAN support
• Leverages proven vSwitch solution
• Wire-speed due to VXLAN in HW
• Easy to setup and manage
• Transparent to OpenStack

7. Technical Forum
Step 1: Create a new Segment in OpenStack
OVS Arista
Neutron
ML2
Create VLAN
Map VNI àVLAN
The new VLAN is not
connected yet
CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP VTEP
OVS OVS OVS OVS
VTI VTI VTI VNTI
HardwareVXLAN VTEP
configured on every leaf switch
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
eAPI
Layer 3 ECMP fabric
for increased
underlay scale

8. Technical Forum
Step 2: Create and deploy aVM
OVS Arista
Neutron
ML2
Create VM
Assign the Network
CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP VTEP
OVS OVS OVS OVS
VTI VTI VTI VTI
HardwareVXLAN VTEP
configured on every leaf switch
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
eAPI
Layer 3 ECMP fabric
for increased
underlay scale

9. Technical Forum
Step 3: Create and deploy a secondVM
OVS Arista
Neutron
ML2 CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP VTEP
OVS OVS OVS OVS
VTI VTI VTI VTI
HardwareVXLAN VTEP
configured on every leaf switch
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
Create another VM
Assign the Network
eAPI
Layer 3 ECMP fabric
for increased
underlay scale

10. Technical Forum
Step 4: L2 traffic flows between theVMs
Layer 3 ECMP fabric
for increased
underlay scale
OVS Arista
Neutron
ML2
L2 traffic is flowing
across L3 fabric
(VXLAN encaped)
CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP VTEP
OVS OVS OVS OVS
VTI VTI VTI VTI
VNI
HardwareVXLAN VTEP
configured on every leaf switch
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
eAPI

11. Technical Forum
Demo: Physical Network Diagram
HW
VTEP
leaf1 leaf2
spine1 spine2eBGP ECMP
Leaf-Spine
Network
172.28.171.101
HW
VTEP
kilo1 host3 host4 kilo2
3.3.3.3 4.4.4.4
ATF-NET1
10.11.0.0/24
L2, VLAN
L3, VXLAN
L2, VLAN
172.28.171.102
172.28.168.30 172.28.168.30

12. Technical Forum
Why Arista for OpenStack?
§ Automation of network provisioning
§ OpenStackVisibility:
• Virtual Machine / Bare Metal (OpenStack Ironic) configuration
• Network configuration
• Statistics
§ High availability support using MLAG via CVX
§ Smooth migration path towards SDN controller
§ Improved scaling via CVX

13. Technical Forum
Use Case 2: SDN Controller with OVSDB

14. Technical Forum
Use Case 2: SDN Controller with OVSDB
• SDN technologies in the overlay
network (NFV)
• Abstraction of network topology via
CVX
• Allows use of MLAG at the leaf
• ExtendVXLAN to the legacy non-
VXLAN network
• Tight integration with Cloud
Orchestration
• Avoid the ~4000VLAN limit
SDN Controller Integration
Physical infrastructure
Hardware VTEP added
to the logical switch
vSwitch
Software
VTEP on
host
CloudVision
eXchange
Network
Virtualization Controller
Cloud
Management
Platform

15. Technical Forum
Step 1: New Bare Metal Server Added
Layer 3 ECMP fabric
for increased
underlay scale
CloudVision
eXchange
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP
VTEP
VTI VTI VTI
VTI
HardwareVXLAN VTEP
configured on every leaf switch
for additional flexibility
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
OVSDB
Add BM server to any rack,
as each one has a HW VTEP
L3 ECMP IP Fabric
VNI

16. Technical Forum
Step 2: Add a HW Gateway to the Logical Switch
Layer 3 ECMP fabric
for increased
underlay scale
CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP
VTEP
VTI VTI VTI
VTI
HardwareVXLAN VTEP
configured on every leaf switch
for additional flexibility
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
VNI
OVSDB

17. Technical Forum
Step 3: L2 Adjacency Between VMs & BM Server
Layer 3 ECMP fabric
for increased
underlay scale
Traffic is flowing
as UDP between VTEPs
CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP
VTEP
VTI VTI VTI
VTI
HardwareVXLAN VTEP
configured on every leaf switch
for additional flexibility
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
VNI
OVSDB

18. Technical Forum
Demo: Logical Network Diagram
NSX Edge Services Gateway
(for Centralized Routing)
LS-web LS-app LS-db
192.168.1.0/24
192.168.2.0/24
192.168.3.0/24
web01
.10
web02
.11
baremetal
.12
app01
.10
app02
.11
db01
.10
db02
.11
.1 .1
.1

19. Technical Forum
Demo: Physical Network Diagram
web01
.10
web02
.11
app01
.10
app02
.11
db01
.10
db02
.11
NSX VTEP NSX VTEP NSX VTEP
baremetal
.12
Arista Hardware VTEP
NSX Edge Services Gateway
(for Centralized Routing)
bleaf13
MLAG
bleaf14 bleaf15
bspine1 bspine2eBGP ECMP
Leaf-Spine
Network
NSX Controller
Cluster
NSX Manager vCenter
10.0.131.10 10.0.132.10 10.0.133.10
192.168.1.1
192.168.2.1
192.168.3.1
192.168.1.0/24 192.168.2.0/24 192.168.3.0/24
10.0.14.253

20. Technical Forum
Why Arista forVMware NSX?
§ Network automation for bare metal provisioning
§ High availability support using MLAG via CVX
§ VMwareVisibility:
• Virtual Machine configuration
• Network configuration
• Statistics
§ Integration with NSX controller using standard OVSDB
§ CVX for improved scale

21. Technical Forum
Use Case 2a: OpenStack with L2 Gateway

22. Technical Forum
OpenStack Neutron,VXLAN, L2 Gateway
Layer 3 ECMP fabric
for increased
underlay scale
CloudVision
eXchange
L3 ECMP IP Fabric
Rack NRack N-1Rack N-2Rack 1
VTEP VTEP VTEP
VTEP
VNI VNI VNI
VNI
HardwareVXLAN VTEP
configured on every leaf switch
for additional flexibility
Layer 2 connectivity between rack
via VXLAN across the L3 fabric
VNI
OVS
Neutron
ML2
L2 GW
Svc plugin
L2 GW as a Service Plugin
is available for Kilo, part of
LibertyOS release
OVSDB

23. Technical Forum
ThankYou