HP Exam HPE7-A03 Topic 2 Question 20 Discussion

Actual exam question for HP's HPE7-A03 exam

Question #: 20
Topic #: 2

You are delivering a replacement collapsed core network proposal to the customer where the core switches will have the switched virtual interlaces (SVl) configured. The customer is not sure that a USX pair of switches will Be able to act as I tie spanning tree root in their environment.

Which options are true about spanning tiee and VSX that will help assure the customer that a VSX pair of switches are appropriate for a collapsed core? (Select two.)

AThe primary vsx switch ts the spanning tree root and the default behavior is the links on the secondary vsx switch are blocked with sub-millisecond failover assured by vsx active-gateway.

BWhen LAG interfaces are configured on a VSX pair of switches, both switches are 'operational primary' and ensure active-active LAG operation equally.

CBoth VSX switches are configured with the system MAC and then create unique STP bridge-IDs to identify 'operational primary' and 'operational secondary' for proper STP functioning

DAruba VSX switches support either multiple spanning tree (MSTP) or rapid per VLAN spanning tree (RPVST).

EThe ISL between VSX switches is never part of STP domain and doesn't send or receive BPDUs on this link and this ensures the 'operational primary' and 'operational secondary' switches are deterministic to other dual-attached switches.

Show Suggested Answer

Suggested Answer: D, E

According to Aruba Campus Access documents and learning resources, Aruba VSX (Virtual Switching Extension) technology is designed to provide advanced high availability and redundancy features for campus networks. Specifically, answer D is correct because Aruba VSX supports both Multiple Spanning Tree Protocol (MSTP) and Rapid Per VLAN Spanning Tree (RPVST), ensuring efficient tree structures for VLANs and rapid convergence in case of topology changes. Answer E is also true as the Inter-Switch Link (ISL) used for the VSX pair is not part of the Spanning Tree Protocol (STP) domain, meaning it does not send or receive Bridge Protocol Data Units (BPDUs). This design prevents the ISL from influencing STP calculations, ensuring that the operational roles of the primary and secondary switches in the VSX pair are clear and predictable to the rest of the network. This separation helps maintain deterministic behavior and failover capabilities in the network, aligning with the goals of a collapsed core network design.

by Suzan at Sep 15, 2024, 08:05 AM

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Weldon

2 months ago

D is also a good option. The VSX switches support both MSTP and RPVST, so they should be able to handle the customer's STP requirements.

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Devorah

2 months ago

Haha, I bet the customer is wondering if the VSX switches will be able to handle their core network without a 'core' meltdown!

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Kaycee

2 months ago

I'm not sure about B, since I thought the LAG operation was active-active, not both switches being 'operational primary'.

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Izetta

2 months ago

C) Both VSX switches are configured with the system MAC and then create unique STP bridge-IDs to identify 'operational primary' and 'operational secondary' for proper STP functioning.

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Corrinne

2 months ago

A) The primary vsx switch ts the spanning tree root and the default behavior is the links on the secondary vsx switch are blocked with sub-millisecond failover assured by vsx active-gateway.

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3 months ago

I think option A is true because the primary VSX switch is the spanning tree root.

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