200-155 · Question #21
What are two advantages to running Fabric Path in the data center over using Spanning Tree? (Choose two.)
The correct answer is C. has L2 multipath forwarding capacities E. uses TTL field to provide loop mitigation. This question identifies two advantages of running Cisco FabricPath in a data center compared to traditional Spanning Tree Protocol (STP). FabricPath provides Layer 2 multipathing and uses a hop-count mechanism for loop prevention.
Question
What are two advantages to running Fabric Path in the data center over using Spanning Tree? (Choose two.)
Options
- Aprovides multi chassis Ether Channel capabilities
- Ballows every switch to send BPDUs to each other to ensure the L2 topology is synchronized
- Chas L2 multipath forwarding capacities
- Duses B02 1 q trunks to ensure VLANs are propagated through the topology
- Euses TTL field to provide loop mitigation
How the community answered
(51 responses)- A6% (3)
- B2% (1)
- C90% (46)
- D2% (1)
Why each option
This question identifies two advantages of running Cisco FabricPath in a data center compared to traditional Spanning Tree Protocol (STP). FabricPath provides Layer 2 multipathing and uses a hop-count mechanism for loop prevention.
While multi-chassis EtherChannel (vPC) can be deployed in a FabricPath environment, it is a separate feature and not a direct advantage of FabricPath over Spanning Tree itself, as STP environments can also use EtherChannel.
FabricPath does not rely on BPDUs for topology synchronization; instead, it uses a Layer 2 link-state routing protocol to build its forwarding tables, unlike Spanning Tree Protocol.
FabricPath provides true Layer 2 multipath forwarding capabilities, allowing all available links in the network to be actively used for data transmission, which significantly increases bandwidth utilization compared to STP's blocking of redundant paths.
Both Spanning Tree and FabricPath environments typically use 802.1Q trunks for VLAN propagation across network links; this is a standard Ethernet feature and not an exclusive advantage of FabricPath.
FabricPath implements a Time-To-Live (TTL) like mechanism within its header to prevent Layer 2 forwarding loops, ensuring packets do not endlessly circulate in the network even in the presence of topology changes.
Concept tested: Cisco FabricPath advantages over STP
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-576403.html
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