Which option is a characteristic of the online software upgrade on the Cisco ASR 5000 Series?

Question

Options

• AThe online upgrade allows active sessions to be maintained until they are self-terminated
• BThe system accepts new sessions during the online upgrade.
• CThe final step is to migrate active PSCs to standby PSCs.
• DThe online upgrade should not be performed during a planned maintenance window.

• A
  92% (55)
• B
  2% (1)
• C
  3% (2)
• D
  3% (2)

Explanation

Option A is correct because the defining purpose of an online (in-service) software upgrade on the ASR 5000 is to preserve active subscriber sessions - they are allowed to continue running and will only end when the subscriber naturally terminates them, minimizing service disruption.

Why the distractors are wrong:

• B is incorrect: the system does not accept new sessions during the upgrade process; new session establishment is suspended while the upgrade proceeds.
• C is incorrect: the final step migrates active PSCs (Packet Services Cards) to newly upgraded cards, not to standby PSCs - the direction matters.
• D is incorrect: online upgrades are specifically designed to be performed during production hours without requiring a maintenance window, which is their primary advantage over offline upgrades.

Memory tip: Think of "online upgrade = keep the lights on." The whole point is that existing sessions stay alive (self-terminated only), which is the opposite of a disruptive maintenance window. If an answer suggests the upgrade causes new interruptions or rejections, it contradicts the "online" philosophy.

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