What is the required to prevent loops in Virtual Systems in a Cluster XL environment?

Question

Options

• AMPLS
• BVRRP
• CBPDU
• DSTP
• EOSPF

• A
  12% (3)
• C
  4% (1)
• D
  77% (20)
• E
  8% (2)

Explanation

STP (Spanning Tree Protocol) is required because ClusterXL Virtual Systems share physical interfaces across cluster members, creating the potential for Layer 2 bridging loops. STP prevents these loops by electing a root bridge and logically blocking redundant paths, ensuring a loop-free topology across the virtual switch environment.

Why the distractors are wrong:

• A. MPLS - a label-based WAN routing technique; operates at Layer 2.5/3 and has no role in loop prevention within a cluster
• B. VRRP - provides default gateway redundancy for hosts; it handles failover, not loop prevention
• C. BPDU - Bridge Protocol Data Units are the messages STP sends, not a protocol that prevents loops on its own; confusing the mechanism for the protocol is a classic trap
• E. OSPF - a Layer 3 link-state routing protocol; loop prevention at Layer 3 is handled by routing metrics, not STP

Memory tip: Think "Span The Path - one clean route, no loops." STP spans a single tree across the network, cutting off redundant Layer 2 paths. If the question mentions a switched/bridged environment (like VS sharing interfaces in a cluster), STP is your answer.

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