How does an IOM3 improve the queue usage over an IOM2 in an Alcatel-Lucent 7750 SR? (Choose two)

Question

Options

• AThe IOM3 adds more memory to both forwarding complexes which increases the total number of
• BThe IOM3 only contains a single forwarding complex which reduces the number of queues used.
• CThe IOM3 allows multiple forwarding classes to be assigned to a single queue.
• DThe IOM3 allows queues to be dynamically allocated between ingress and egress.
• EThe IOM3 has a larger CPU capable of tracking active hardware queue utilization and adjusting

• A
  19% (5)
• B
  65% (17)
• C
  12% (3)
• E
  4% (1)

Explanation

On the IOM2, each of its two forwarding complexes (FP2) maintains its own queue sets, meaning traffic that transits between the two FPs can consume queues on both - effectively doubling queue usage for certain traffic flows. The IOM3 consolidates to a single forwarding complex (FP3), eliminating this inter-FP transit queuing and cutting queue consumption roughly in half (B). Additionally, the IOM3 introduces dynamic queue allocation, allowing the shared queue pool to shift fluidly between ingress and egress based on actual demand, rather than the IOM2's static split where ingress and egress each held a fixed, pre-allocated portion regardless of whether they needed them (D).

Why the distractors are wrong:

• A is incorrect because IOM3 has one FP, not "both forwarding complexes" receiving more memory.
• C is incorrect - mapping multiple forwarding classes to a single queue is a general QoS configuration capability available on both IOM2 and IOM3, not an IOM3 improvement.
• E is incorrect - queue improvements are architectural (single FP, dynamic allocation), not driven by a larger CPU dynamically monitoring and adjusting queues at runtime.

Memory tip: Think "IOM3 = One + On-Demand" - One forwarding complex removes duplicate queuing, and On-Demand dynamic allocation stops wasting queues on whichever side (ingress/egress) isn't busy.

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