System enables overlay connectivity orchestrated through an SDN-based control
plane. This ensures instant availability of computing and application workloads
in the virtualized data center, and removes network provisioning challenges.
Cisco VTS uses VXLAN
to overcome scale limits in the data center and to segment the network better.
VXLAN is designed to provide the same Ethernet Layer 2 network services as VLAN
does, but with greater extensibility and flexibility. The dependence on a Layer
3 underlay network allows VXLAN to take complete advantage of Layer 3 routing,
equal-cost multipath (ECMP) routing, and link aggregation protocols. Virtual
Topology System supports hardware and software VTEPs to segment the data center
System supports both VXLAN overlays using the BGP EVPN control plane and VXLAN
overlays using IP Multicast-based techniques.
using MP-BGP EVPN based control plane to manage the VXLAN overlay provides a
distributed network database, which enables federation and scaling. The BGP
EVPN solution is the preferred option, and it can be flexibly implemented using
the infrastructure policy constructs within the Virtual Topology System
System implements the highly scalable MP-BGP with the standards-based EVPN
address family as the overlay control plane to:
attached host MAC and IP addresses and avoid the need for unknown unicast, and
multidestination traffic by either using the multicast capabilities of the
underlay or using unicast ingress replication over a unicast network core
(without multicast) for forwarding Layer 2 multicast and broadcast packets
Address Resolution Protocol (ARP) requests early
separation is also maintained among the interconnected VXLAN networks.
Capabilities such as route filtering and route reflection can be used to
provide flexibility and scalability in deployment.
Workflow for Establishing a VXLAN Overlay Network with Hardware and Software
VTEPs using BGP EVPN
steps provide a high-level workflow for establishing a simple VXLAN overlay
network with hardware and software VTEPs using a BGP EVPN control plane:
After you commit
the changes to the network group, Virtual Topology System automatically pushes
all the relevant configuration information to the respective leafs, Cisco IOS
XRv route reflectors, and DCI gateways. At this point, the Admin Domain is
ready to build overlay networks based on the intent defined by the service
policy or through a Virtual Machine Manager (VMM) or orchestration environment
For a detailed,
illustrated example, see
Topology System: Data Center Automation for Next-Generation Cloud Architectures