200-301 Question #830: Real Exam Question with Answer & Explanation

Question

Which two command sequences must you configure on a switch to establish a Layer 3 EtherChannel with an open-standard protocol? (Choose two.)

Options

• Ainterface GigabitEthernet0/0/1
• Binterface GigabitEthernet0/0/1
• Cinterface GigabitEthernet0/0/1
• Dinterface port-channel 10
• Einterface port-channel 10

Explanation

To configure a Layer 3 EtherChannel using an open-standard protocol like LACP, individual member interfaces are configured for Layer 3 and LACP, and the logical port-channel interface is assigned an IP address.

Common mistakes.

• A. The channel-group 10 mode on command forces the EtherChannel without using any negotiation protocol (LACP or PAgP), thus it is not an open-standard protocol.
• C. The channel-group 10 mode desirable command uses PAgP, which is a Cisco proprietary protocol, not an open-standard one.
• E. Configuring the port-channel with switchport mode trunk makes it a Layer 2 interface, which conflicts with the requirement for a Layer 3 EtherChannel that routes traffic directly and has an IP address assigned.

Concept tested. Layer 3 LACP EtherChannel Configuration

Reference. https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-5/configuration_guide/b_165_ha_9300_cg/b_165_ha_9300_cg_chapter_010.html#concept_E4D2B6664C7243EEB4A45B96E06D28C4

No community discussion yet for this question.