200-155 · Question #225
Which option is a benefit of using Fabric Path as opposed to the spanning tree feature?
The correct answer is D. it allows optimized Layer 2 extension by using Mac-in-TCP encapsulation. FabricPath provides a more advanced Layer 2 forwarding mechanism compared to Spanning Tree Protocol, enabling a routed Layer 2 domain that efficiently extends network services.
Question
Which option is a benefit of using Fabric Path as opposed to the spanning tree feature?
Options
- AIt uses all uplinks through ECMP
- BIt allows automation by provisioning VLANs dynamically
- CIt provides address space scalability by using a 12-bit value for the switch IDs.
- Dit allows optimized Layer 2 extension by using Mac-in-TCP encapsulation
How the community answered
(28 responses)- A4% (1)
- C4% (1)
- D93% (26)
Why each option
FabricPath provides a more advanced Layer 2 forwarding mechanism compared to Spanning Tree Protocol, enabling a routed Layer 2 domain that efficiently extends network services.
While FabricPath does use all uplinks through ECMP, this is a consequence of its routing-like architecture for Layer 2 extension, not the fundamental mechanism of the extension itself.
FabricPath is a data plane forwarding technology and does not inherently provide automation for dynamic VLAN provisioning.
FabricPath uses a 12-bit switch ID for internal routing scalability within the fabric, but this is not primarily for general Layer 2 address space scalability of end devices.
FabricPath enables optimized Layer 2 extension by utilizing a routing-like mechanism at Layer 2, which involves encapsulating original Ethernet frames within a new header. This specific encapsulation allows for shortest path first routing and equal-cost multipathing (ECMP) within the Layer 2 domain, unlike Spanning Tree Protocol which blocks redundant paths.
Concept tested: Cisco FabricPath benefits and architecture
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-536093.html
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