300-320 · Question #614
Which Cisco technology uses the IS-IS protocol to avoid STP in the data center?
The correct answer is A. FabricPath. Cisco FabricPath is Cisco's proprietary Layer 2 fabric technology that uses IS-IS as its control plane to build a loop-free topology, eliminating the need for STP in the data center.
Question
Which Cisco technology uses the IS-IS protocol to avoid STP in the data center?
Options
- AFabricPath
- BTRILL
- CVPC
- DVSS
How the community answered
(53 responses)- A94% (50)
- C4% (2)
- D2% (1)
Why each option
Cisco FabricPath is Cisco's proprietary Layer 2 fabric technology that uses IS-IS as its control plane to build a loop-free topology, eliminating the need for STP in the data center.
FabricPath encapsulates Ethernet frames with a FabricPath header and uses IS-IS to calculate loop-free paths across the fabric, allowing all links to be active simultaneously without STP blocking ports.
TRILL (Transparent Interconnection of Lots of Links) is the IETF standards-based equivalent that also uses IS-IS, but the question asks specifically for a Cisco proprietary technology.
vPC (Virtual Port Channel) allows dual-homed connections to two switches without STP blocking but does not use IS-IS and is not a fabric protocol.
VSS (Virtual Switching System) combines two Cisco Catalyst switches into a single logical switch but does not use IS-IS and is an access/aggregation layer technology, not a fabric solution.
Concept tested: Cisco FabricPath IS-IS based STP elimination
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white_paper_c11-687554.html
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