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Difficulty: EasyLayer 2 and Layer 3 EtherChannel (LACP)

SwitchA has its interconnecting physical interfaces configured with the command `channel-group 1 mode passive`. Which channel-group mode must be configured on SwitchB for the IEEE 802.3ad LACP EtherChannel to successfully form?

  1. `active`Answer
  2. B
    `passive`
  3. C
    `desirable`
  4. D
    `on`

Answer

The mode configured on SwitchB must be `active`.
The `active` mode causes the switch port to actively initiate negotiations by sending LACP frames. Since SwitchA is configured as `passive`, it only responds to received LACP frames. SwitchB must be in `active` mode so LACP frames are transmitted to start the dynamic trunk negotiation.

Step-by-Step Solution

1
Analyze the LACP mode configured on SwitchA.
SwitchA is set to `passive`, meaning it responds to LACP packets but will not initiate LACP frame exchanges.
LACP passive mode requires an incoming LACP negotiation request to begin bundling interfaces.
2
Determine the compatible LACP mode required on SwitchB.
SwitchB must be set to `active` so that it actively transmits LACP control frames to SwitchA.
At least one end of an LACP EtherChannel link must be in `active` mode for successful negotiation.

Key Concept

LACP Mode Compatibility
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Topics

Layer 2 and Layer 3 EtherChannel (LACP)

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