352-001 · Question #424
You are designing a FabricPath network that connects to a spine-and-leaf topology using layer 2 IS-IS as the IGP. The solution should be able to detect changes in the network topology and calculate…
The correct answer is B. The switch operating system uses multiple equal-cost, parallel links that provide ECMP. D. FabricPath Layer 2 IS-IS uses the standard IS-IS functionality to populate up to 16 routes for a E. This path is used for forwarding unicast Fabricpath frames. F. Each switch computes its shortest path to every other switch in the network using the SPF. The software sends hello packets on the FabricPath core ports to form adjacencies. After the software forms IS-IS adjacencies, the FabricPath unicast traffic uses the equal cost multipath(ECMP) feature of Layer 2 IS-IS to forward traffic. ECMP provides up to 16 paths for…
Question
You are designing a FabricPath network that connects to a spine-and-leaf topology using layer 2 IS-IS as the IGP. The solution should be able to detect changes in the network topology and calculate loop-free paths to other nodes in the network that are being used as top-of-rack switches. Which four options are characteristics of this FabricPath design solution? (Choose 4)
Options
- AThe FabricPath domain should be replaced because it does not run STP.
- BThe switch operating system uses multiple equal-cost, parallel links that provide ECMP.
- CTo use the basic FabricPath functionality, you must configure IS-IS on every interface between
- DFabricPath Layer 2 IS-IS uses the standard IS-IS functionality to populate up to 16 routes for a
- EThis path is used for forwarding unicast Fabricpath frames.
- FEach switch computes its shortest path to every other switch in the network using the SPF
- GThe interfaces in a FabricPath network run only the FabricPath Layer 2 IS-IS protocol with FTags
How the community answered
(65 responses)- A12% (8)
- B51% (33)
- C8% (5)
- G29% (19)
Explanation
The software sends hello packets on the FabricPath core ports to form adjacencies. After the software forms IS-IS adjacencies, the FabricPath unicast traffic uses the equal cost multipath(ECMP) feature of Layer 2 IS-IS to forward traffic. ECMP provides up to 16 paths for unicast traffic. FabricPath Layer 2 IS-IS is based on the standard IS-IS protocol with the following extensions for the FabricPath environment: FabricPath has a single IS-ISarea with no hierarchical Layer 1/Layer 2 routing as prescribed within the IS-IS standard. All switches within the FabricPath network are in a single Layer 1 The switch uses a MAC address that is different from the MAC address used for Layer 3 IS- The software adds a new sub-TLV that carries switch ID information, which is not in standard IS-IS. This feature allows Layer 2 information to be exchanged through the existing IS-IS protocol implementation. Each switch computes its shortestpath to every other switch in the networkusing the shortest- path first (SPF) algorithm. This path is used for forwarding unicast FabricPath frames. FabricPath Layer 2 IS-IS uses the standard IS-IS functionality to populate up to 16 routes for a given destination switch. The software uses multiple equal-cost available parallel links that FabricPath IS-IS introduces certain modifications to the standard IS-IS in order to support the construction of broadcast and multicast trees (identified by the FTags). Specifically, using FabricPath, the software constructs two loop-free trees for forwarding multidestination traffic.
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