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Difficulty: Very hardLayer 2 and Layer 3 EtherChannel (LACP)

A network engineer is configuring a routed (Layer 3) EtherChannel bundle (Port-channel 12) on a Cisco Catalyst switch using Link Aggregation Control Protocol (LACP). The bundle must aggregate physical interfaces GigabitEthernet1/0/1 and GigabitEthernet1/0/2, actively negotiate LACP trunking, and host the IPv4 default gateway subnet interface with IP address 192.168.100.1/30. Place the Cisco IOS configuration command steps in the correct sequential order from first to last to complete this configuration cleanly.

  1. 1interface range GigabitEthernet1/0/1 - 2
  2. 2no switchport
  3. 3channel-group 12 mode active
  4. 4interface Port-channel 12
  5. 5ip address 192.168.100.1 255.255.255.252

Answer

The correct sequence of commands is: 1) interface range GigabitEthernet1/0/1 - 2, 2) no switchport, 3) channel-group 12 mode active, 4) interface Port-channel 12, 5) ip address 192.168.100.1 255.255.255.252.
To create a routed (Layer 3) EtherChannel using LACP, the physical interfaces must first be selected ('interface range GigabitEthernet1/0/1 - 2') and converted to Layer 3 routed ports ('no switchport'). Next, the LACP dynamic bundle is formed using 'channel-group 12 mode active'. Afterwards, the administrator switches to the logical bundle interface context ('interface Port-channel 12') to assign the IPv4 address ('ip address 192.168.100.1 255.255.255.252').

Step-by-Step Solution

1
Select the target physical member interfaces
Enters interface range configuration mode for GigabitEthernet1/0/1 and 1/0/2.
Configuration changes must apply to both member links simultaneously.
2
Remove Layer 2 switching capabilities
Converts physical member interfaces to Layer 3 routed ports.
Issuing 'no switchport' on member interfaces prior to bundling ensures the created port-channel automatically inherits routed Layer 3 operational mode.
3
Create and bind member interfaces to the channel-group
Adds physical member interfaces to Port-channel 12 using LACP active mode.
The 'mode active' keyword specifies active LACP packet transmission to initiate bundle formation.
4
Navigate to the logical bundle interface
Enters configuration mode for interface Port-channel 12.
Logical layer configurations (such as IP addressing) must be applied directly to the port-channel interface.
5
Configure IP address on the port-channel
Assigns IP address 192.168.100.1/30 to Port-channel 12.
Layer 3 EtherChannels hold IP configuration on the logical interface, allowing traffic routing over the aggregated links.

Key Concept

Layer 3 EtherChannel LACP Configuration Sequence
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Topics

Layer 2 and Layer 3 EtherChannel (LACP)

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