QuestionQ672

IP Services

Which two command sequences need to be configured on a switch to create a Layer 3 EtherChannel by using an open-standard protocol?

Choose two
  • A interface GigabitEthernet0/0/1 channel-group 10 mode auto
  • B interface GigabitEthernet0/0/1 channel-group 10 mode on
  • C interface port-channel 10 no switchport ip address 172.16.0.1 255.255.255.0
  • D interface GigabitEthernet0/0/1 channel-group 10 mode active
  • E interface port-channel 10 switchport switchport mode trunk
Explanation

A Layer 3 EtherChannel that uses an open standard must use LACP, which on Cisco switches is configured with channel-group ... mode active or passive; auto is for PAgP, and on does not use a negotiation protocol. For a Layer 3 EtherChannel, the port-channel itself must be a routed interface by applying no switchport, and the IP address is assigned to that port-channel interface rather than configuring it as a Layer 2 trunk. Cisco documentation states that Layer 3 EtherChannels should have the Layer 3 address on the port-channel logical interface and that no switchport puts the interface into Layer 3 mode.

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