How do you allow a new VLAN 200 for downstream access switch with VSX pair using VSX LAG?

Question

Options

• Avlan trunk allowed 200 in MLAG 1
• Bvlan trunk add 100 in MLAG1
• Cvlan trunk allowed all in LAG 1 multi-chassis
• Dvlan trunk add 100 in LAG1 multi-chassis

• A
  4% (1)
• B
  4% (1)
• C
  80% (20)
• D
  12% (3)

Explanation

Option C is correct because HPE Aruba AOS-CX uses the multi-chassis keyword - not "MLAG" - to identify a VSX LAG interface, and the proper command verb for permitting VLANs on a trunk is vlan trunk allowed. Specifying allowed all permits all VLANs including the new VLAN 200 to traverse the VSX LAG to the downstream access switch.

Why the distractors fail:

• A uses "MLAG" (an Arista/generic term) instead of Aruba's multi-chassis designation, making it invalid syntax on AOS-CX.
• B has two errors: it references the wrong VLAN (100, not 200) and again uses "MLAG" rather than multi-chassis.
• D uses the wrong VLAN number (100) and the wrong verb (add instead of allowed), even though it correctly uses the multi-chassis keyword.

Memory tip: On Aruba AOS-CX, remember "MAC" - Multi-chassis, Allowed, Correct". VSX LAGs always say multi-chassis; VLAN trunks always say allowed. If an answer says MLAG or uses add, it's wrong on Aruba gear.

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