Discover the key component that enables Cisco ACI fabric to achieve seamless Layer 2 and Layer 3 connectivity across pods and physical locations. Learn how this technology enhances the scalability and flexibility of your data center network.
Question
Which component provides Cisco ACI fabric with Layer 2 and Layer 3 connectivity across pods and physical locations?
A. Inter-Pod Network
B. VXLAN overlay
C. COOP control plane
D. Cisco APIC control cluster
Answer
B. VXLAN overlay
Explanation
The VXLAN overlay provides Cisco ACI fabric with Layer 2 and Layer 3 connectivity across pods and physical locations.
VXLAN (Virtual Extensible LAN) is an overlay technology that enables Layer 2 communication between endpoints across a Layer 3 network. In the Cisco ACI architecture, VXLAN is used to create a unified Layer 2 domain across multiple pods and physical locations, allowing seamless communication between endpoints regardless of their physical location.
The VXLAN overlay in Cisco ACI encapsulates Layer 2 frames within Layer 3 packets, enabling them to be transported across the underlying IP network. Each pod in the ACI fabric is assigned a unique VXLAN Network Identifier (VNI), which is used to differentiate between different Layer 2 domains. When an endpoint in one pod needs to communicate with an endpoint in another pod, the VXLAN overlay encapsulates the Layer 2 frame with the appropriate VNI and forwards it across the Layer 3 network to the destination pod.
This VXLAN overlay approach provides several benefits:
- Scalability: VXLAN allows ACI to scale beyond the 4,096 VLAN limitation, supporting up to 16 million unique Layer 2 segments.
- Flexibility: Endpoints can be placed anywhere in the fabric, regardless of their physical location, enabling workload mobility and simplified network management.
- Multi-tenancy: VXLAN enables the creation of isolated Layer 2 domains for different tenants, ensuring secure and independent network environments.
In summary, the VXLAN overlay is the key component that provides Cisco ACI fabric with Layer 2 and Layer 3 connectivity across pods and physical locations, enabling a scalable, flexible, and multi-tenant data center network architecture.
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