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Zorluk: OrtaLayer 2 and Layer 3 EtherChannel (LACP)

A network administrator is connecting two Cisco Catalyst switches via a multi-link bundle using Link Aggregation Control Protocol (LACP). Which two conditions or configuration settings are required for the EtherChannel bundle to form and operate correctly? (Select two.)

  1. At least one of the switches must have its physical member interfaces configured in LACP active mode.Cevap
  2. All physical member interfaces in the bundle must be configured with identical speed, duplex, and VLAN settings.Cevap
  3. C
    Configuring both switches in LACP passive mode allows the bundle to negotiate successfully once initial data frames are sent.
  4. D
    If member physical trunk ports have mismatched native VLANs, LACP automatically harmonizes the VLAN configuration across the bundle.

Cevap

The EtherChannel bundle successfully forms when at least one side is configured in LACP active mode and all member interfaces share matching operational parameters such as speed, duplex, and VLAN configurations.
For an LACP EtherChannel to form, at least one endpoint must actively send LACP packets (active mode), allowing negotiation when paired with an active or passive remote interface. Additionally, all bundled physical interfaces must have identical speed, duplex, switchport mode, native VLAN, and allowed VLAN attributes.

Adım Adım Çözüm

1
Analyze LACP negotiation modes
LACP modes must be compatible (active-active or active-passive). Matching passive-passive modes will fail to initiate negotiation.
Passive mode only responds to LACP packets received; if neither end initiates, no negotiation occurs.
2
Evaluate member interface attribute requirements
All member links must match speed, duplex, trunking status, allowed VLANs, and native VLAN.
EtherChannel treats bundled physical links as a single logical interface, requiring identical physical and Layer 2 properties.

Anahtar Kavram

LACP Mode Compatibility and Prerequisite Interface Matching for EtherChannel
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