Cisco 200-301 Exam: Configuring Layer 3 EtherChannel

Establishing Layer 3 EtherChannel: Configuration Steps


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



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A. B. C. D. E.


To establish a Layer 3 EtherChannel with an open-standard protocol, we need to perform the following two steps:

Step 1: Configure EtherChannel on the Switch Interface We need to configure the EtherChannel on the switch interface that we want to use for the channel. We have two options to set the channel mode on the interface:

  • mode on: Configures the interface to use EtherChannel only if the other end is also configured to use EtherChannel.
  • mode active: Forces the interface to always use EtherChannel, even if the other end is not configured to use EtherChannel.

Therefore, options B and D are the two possible command sequences to configure the EtherChannel on the switch interface.

Option A "interface GigabitEthernet0/0/1 channel-group 10 mode auto" is not correct because the "mode auto" option sets the interface to negotiate the channel mode with the other end, which may result in the use of either EtherChannel or individual links.

Step 2: Configure Layer 3 Parameters on the Port-Channel Interface Once we have configured the EtherChannel on the switch interface, we need to create the Port-Channel interface and configure the Layer 3 parameters, such as the IP address and subnet mask. To create the Port-Channel interface, we use the "interface port-channel" command followed by the channel number that we used in the switch interface configuration.

Therefore, option C "interface port-channel 10 no switchport ip address" is the correct command sequence to configure the Layer 3 parameters on the Port-Channel interface.

Option E "interface port-channel 10 switchport switchport mode trunk" is not correct because it configures the Port-Channel interface as a Layer 2 trunk interface, which is not required for a Layer 3 EtherChannel.