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Difficulty: EasyLayer 2 and Layer 3 EtherChannel (LACP)

Two switches are connected using two physical Ethernet interfaces. A network technician configures the interfaces on Switch A with the command `channel-group 1 mode passive` to form a Link Aggregation Control Protocol (LACP) EtherChannel. Which mode must be configured on Switch B's interfaces to successfully negotiate and establish the EtherChannel bundle?

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

Answer

active mode must be configured on Switch B.
Link Aggregation Control Protocol (LACP) requires at least one switch to actively initiate packet negotiation. Since Switch A is set to passive mode, Switch B must be configured in active mode to send LACP negotiation frames and bring up the EtherChannel.

Step-by-Step Solution

1
Identify the protocol in use.
The scenario uses LACP (IEEE 802.3ad) based on the passive mode keyword.
LACP uses active and passive modes, whereas PAgP uses desirable and auto modes.
2
Analyze LACP negotiation requirements.
Passive mode responds to LACP packets but does not send initial negotiation requests. At least one side must actively send LACP frames.
If both sides are set to passive, neither initiates negotiation and no EtherChannel is formed.
3
Determine the required remote configuration.
Switch B must be set to active mode.
An active-passive pairing successfully establishes an LACP EtherChannel bundle.

Key Concept

LACP Mode Negotiation Compatibility
Estimated Time:45s
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Topics

Layer 2 and Layer 3 EtherChannel (LACP)

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