200-155 · Question #61
Which option describes the STP requirements for Cisco Fabric Path?
The correct answer is D. STP is not required on Cisco Fabric Path interfaces. Cisco FabricPath provides a Layer 2 multipath routing solution that inherently prevents loops, eliminating the need for Spanning Tree Protocol (STP) on FabricPath interfaces.
Question
Which option describes the STP requirements for Cisco Fabric Path?
Options
- AMST must be configured an every Cisco Fabric Path VLAN.
- BSTP is required only to resolve border link failures
- CRPVST must be configured on every Cisco Fabric Path VLAN
- DSTP is not required on Cisco Fabric Path interfaces.
How the community answered
(48 responses)- A2% (1)
- C4% (2)
- D94% (45)
Why each option
Cisco FabricPath provides a Layer 2 multipath routing solution that inherently prevents loops, eliminating the need for Spanning Tree Protocol (STP) on FabricPath interfaces.
MST (Multiple Spanning Tree) is an STP variant, and FabricPath's design makes any form of STP unnecessary on its interfaces.
While STP might be used at the edge of a FabricPath domain or on traditional Ethernet segments, it is not required for loop resolution within the FabricPath core itself.
RPVST (Rapid Per-VLAN Spanning Tree) is another STP variant, and like other STP protocols, it is redundant in a FabricPath-enabled network.
Cisco FabricPath utilizes an IS-IS-based routing protocol to build a loop-free Layer 2 topology, allowing for all paths to be active without needing STP. Therefore, STP is not required to be configured or run on interfaces participating in a FabricPath domain.
Concept tested: Cisco FabricPath and STP interaction
Source: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/fabricpath/513_n1_1/Cisco_n5k_fabricpath_config_gd_513_n1_1/Cisco_n5k_fabricpath_config_gd_513_n1_1_chapter01.html
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