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300-320 · Question #403

300-320 Question #403: Real Exam Question with Answer & Explanation

The correct answer is B: Design lacks of hardware diversity. Connecting the VSL (Virtual Switch Link) between two VSS chassis exclusively through supervisor engine ports lacks hardware diversity, creating a single point of failure for the virtual switch domain.

Question

What results to connect 2 VSS routers on 10G card over Supervisor engine ports?

Options

  • AIt will cause loop
  • BDesign lacks of hardware diversity

Explanation

Connecting the VSL (Virtual Switch Link) between two VSS chassis exclusively through supervisor engine ports lacks hardware diversity, creating a single point of failure for the virtual switch domain.

Common mistakes.

  • A. VSS presents both chassis as a single logical switch to the network, so inter-chassis links are treated as internal fabric rather than external links that would trigger STP loop detection.

Concept tested. VSS VSL hardware diversity design requirement

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12-2SX/configuration/guide/book/vss.html

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