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Difficulty: EasyLayer 2 and Layer 3 EtherChannel (LACP)

A network administrator needs to aggregate physical interfaces GigabitEthernet0/1 and GigabitEthernet0/2 into a Layer 3 LACP EtherChannel (Port-channel 1) and assign an IP address of 10.1.1.1/30 to the logical interface. Place the configuration steps in the correct sequential order from first to last.

  1. 1Enter interface configuration mode for member ports: interface range GigabitEthernet0/1 - 2
  2. 2Convert physical member interfaces to routed ports: no switchport
  3. 3Assign physical interfaces to channel group using LACP: channel-group 1 mode active
  4. 4Enter logical interface configuration mode: interface Port-channel 1
  5. 5Assign the IPv4 address to the logical port-channel: ip address 10.1.1.1 255.255.255.252

Answer

The correct configuration order is: 1) Select physical member ports (interface range GigabitEthernet0/1 - 2), 2) Disable Layer 2 switching (no switchport), 3) Associate ports with LACP channel-group (channel-group 1 mode active), 4) Enter logical port-channel mode (interface Port-channel 1), and 5) Assign the IP address (ip address 10.1.1.1 255.255.255.252).
To successfully configure a Layer 3 EtherChannel using LACP, physical member interfaces must first be selected (`interface range`), converted to routed ports (`no switchport`), and joined to an active LACP channel group (`channel-group 1 mode active`). Afterwards, the logical interface context must be accessed (`interface Port-channel 1`) to assign the designated IP address (`ip address 10.1.1.1 255.255.255.252`).

Step-by-Step Solution

1
Select target physical interfaces
System enters interface range configuration mode prompt switch(config-if-range)#
Configuration commands must target both physical member interfaces simultaneously.
2
Execute 'no switchport' on physical member interfaces
Physical ports are converted from Layer 2 switch ports to Layer 3 routed ports
Layer 3 EtherChannels require member interfaces to operate in routed mode.
3
Execute 'channel-group 1 mode active'
Physical interfaces are added to EtherChannel group 1 using LACP active negotiation, creating Port-channel 1
The 'active' keyword enables dynamic IEEE 802.3ad LACP protocol negotiation.
4
Execute 'interface Port-channel 1'
System enters interface configuration mode for the logical port-channel switch(config-if)#
Layer 3 IP attributes must be applied directly to the logical bundled interface.
5
Execute 'ip address 10.1.1.1 255.255.255.252'
Logical interface Port-channel 1 receives the specified IP address and subnet mask
This enables routing over the aggregated logical EtherChannel link.

Key Concept

Layer 3 EtherChannel Configuration with LACP
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Topics

Layer 2 and Layer 3 EtherChannel (LACP)

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