E-VPC (Tenant)

In the most common scenario, end consumers or tenants

of the data center infrastructure deal with a logical network

topology that defines the connectivity and policy requirements

of applications. As an illustrative example, the canonical 3-tier

application in Figure 5 shows various workload nodes of a

tenant named “BLUE.” Typically, a tenant provisions these

workloads using orchestration software such as OpenStack,

VMware vSphere, or CCF Controller GUI/CLI, directly. As part

of that provisioning workflow, the CCF Controller seamlessly

enables the logical topology onto the physical and virtual

switches.

Mapping Logical to Physical

The BLUE Tenant has three logical network segments. Each of

the three segments represents the broadcast domain for the

3-tiers—Web, App, and Database. Let’s say in this example,

Web1,2 and App1,2 are virtualized workloads but DB1,2 is

comprised of physical workloads. Following the rules defined

by the data center administrator, the orchestration system

provisions requested workloads across different physical nodes

within the data center. As an example, the logical topology

shown in Figure 5 could be mapped on the pod network.

The CCF Controller handles the task of providing optimal

connectivity, between these loads dispersed across the pod,

while ensuring tenant separation and security.

In order to simplify the example, we only show racks that host

virtualized and physical workloads in the figure above, but

similar concepts apply for implementing tenant connectivity to

external router and chaining shared services.

An illustrative sample set of entries in various forwarding tables

highlight some of the salient features of CCF described in earlier

sections.

• L3 routing decision is made at the first hop leaf switch

(distributed virtual routing—no hair-pinning)

• L2 forwarding across the pod without special fabric

encapsulation (no tunneling)

• Full load-balancing across the various LAG links (leaf and

spines)

• Leaf/Spine mesh connectivity within the physical fabric for

resilience

Datasheet

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5

Figure 5: CCF Logical Topology

Figure 6: Application Centric Configuration