ACSP AOS-CX VSF and VSX 2 — Questions and Answers
Question 1: In a VSF stack, which member role is responsible for running the control plane and making forwarding decisions for the entire stack?
- Standby
- Conductor (Correct answer)
- Member
- Relay
Correct answer: Conductor
The Conductor is the primary control-plane switch in a VSF stack, managing all forwarding and configuration for the virtual fabric.
Question 2: What is the maximum number of switches that can be combined in a single AOS-CX VSF stack?
- 2
- 4
- 8 (Correct answer)
- 16
Correct answer: 8
AOS-CX VSF supports up to 8 members in a single virtual switching fabric.
Question 3: Which VSF topology provides the highest level of resiliency against a single link failure?
- Chain
- Ring (Correct answer)
- Star
- Mesh
Correct answer: Ring
A ring topology connects the last VSF member back to the conductor, so any single link failure leaves all members connected via the remaining path.
Question 4: When a VSF stack splits due to a link failure, which mechanism prevents both partitions from simultaneously acting as the active conductor?
- LACP PDU exchange
- Multi-Active Detection (MAD) (Correct answer)
- STP root election
- OSPF dead-interval timer
Correct answer: Multi-Active Detection (MAD)
MAD (Multi-Active Detection) uses a dedicated link or OOBM network to detect split-stack conditions and shut down the secondary partition.
Question 5: In AOS-CX VSF, what automatically happens to VSF member port numbering when a new switch joins as member 3?
- Ports are renumbered starting from 3/1/1 (Correct answer)
- Ports retain their physical numbers and the member prefix is added
- All stack ports are renumbered from 1/1/1
- The conductor assigns arbitrary numbers
Correct answer: Ports are renumbered starting from 3/1/1
VSF member ports are prefixed with the member number, so member 3's first port becomes 3/1/1, giving each member a unique port namespace.
Question 6: After a VSF conductor failover, which switch takes over the conductor role?
- The switch with the highest MAC address
- The designated Standby member (Correct answer)
- The switch with the most uplinks
- The member with the lowest member ID
Correct answer: The designated Standby member
The pre-elected Standby member immediately assumes the Conductor role upon detecting conductor failure, minimizing reconvergence time.
Question 7: Which command displays the current VSF topology, member roles, and software version for each member in AOS-CX?
- show vsf detail (Correct answer)
- show stack-manager
- show fabric topology
- show redundancy status
Correct answer: show vsf detail
The 'show vsf detail' command provides a comprehensive view of all VSF members, their roles, status, and running software.
ACSP AOS-CX VSF and VSX 2
In a VSF stack, which member role is responsible for running the control plane and making forwarding decisions for the entire stack?