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.
Table of Contents
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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