200-155 · Question #166
Refer to the exhibit. Which statement accurately describes how traffic is handled within the fabric?
The correct answer is A. Traffic with the source and the destination on the same leaf switch is managed locally, and all. In a Cisco ACI fabric, traffic with both the source and destination on the same leaf switch is handled locally. This design ensures efficient switching for intra-leaf communication, while inter-leaf traffic is routed through the spine layer.
Question
Refer to the exhibit. Which statement accurately describes how traffic is handled within the fabric?
Exhibit
Options
- ATraffic with the source and the destination on the same leaf switch is managed locally, and all
- BAll traffic is managed by the master spine switch that is orchestrated by the Cisco APIC host.
- CTraffic with the source and the destination on the same leaf switch is managed locally, and all
- DAll traffic is managed by the master leaf switch that is orchestrated by the Cisco APIC host.
How the community answered
(30 responses)- A93% (28)
- C3% (1)
- D3% (1)
Why each option
In a Cisco ACI fabric, traffic with both the source and destination on the same leaf switch is handled locally. This design ensures efficient switching for intra-leaf communication, while inter-leaf traffic is routed through the spine layer.
In a leaf-spine fabric, traffic where both the source and destination endpoints are connected to the same leaf switch is switched locally on that leaf, optimizing latency and bandwidth. Traffic destined for an endpoint on a different leaf switch would be forwarded up to the spine switch and then down to the destination leaf.
The Cisco APIC cluster orchestrates the fabric but does not manage data plane traffic itself; spine switches forward traffic between leaf switches, but there isn't a single 'master spine' managing all traffic.
This option is a partial statement similar to A; however, since A is indicated as correct, C must contain an inaccuracy or incomplete description in its full form compared to A's full and correct statement of traffic handling.
The APIC orchestrates, but a 'master leaf switch' does not manage all traffic; traffic is distributed across the fabric, and leaf switches handle local traffic and forward inter-leaf traffic to spines.
Concept tested: Cisco ACI traffic forwarding in leaf-spine fabric
Source: https://www.cisco.com/c/en/us/products/collateral/cloud-systems-management/application-centric-infrastructure/white-paper-c11-739349.html#LeafSpinearchitecture
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