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Difficulty: EasyLayer 2 and Layer 3 EtherChannel (LACP)

An engineer wants to establish an LACP-based EtherChannel between Switch-A and Switch-B. Switch-A is configured with the `channel-group 5 mode passive` interface command. Which mode must be configured on Switch-B for the link aggregation bundle to form successfully?

  1. activeAnswer
  2. B
    passive
  3. C
    desirable
  4. D
    auto

Answer

The interface mode on Switch-B must be set to 'active'.
Link Aggregation Control Protocol (LACP) requires at least one side of the connection to actively initiate negotiations. Because Switch-A is set to passive mode, it will only respond to LACP frames. Configuring Switch-B in active mode ensures LACP negotiation packets are transmitted, bringing up the EtherChannel.

Step-by-Step Solution

1
Identify protocol and mode characteristics
Switch-A is using LACP in passive mode.
Passive mode responds to LACP packets but does not transmit initial negotiation frames.
2
Evaluate negotiation requirements
At least one endpoint must actively initiate LACP frames.
Without an active initiator, no LACP control frames are sent.
3
Select matching mode for Switch-B
Switch-B must use 'active' mode.
Setting Switch-B to active mode initiates LACP negotiations.

Key Concept

LACP Mode Compatibility
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Topics

Layer 2 and Layer 3 EtherChannel (LACP)

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