Switching – EtherChannels (02)

Configuring EtherChannels:-

Configuring Port Channel Logical Interfaces for Layer 3 EtherChannels

When configuring Layer 2 EtherChannels, you cannot put Layer 2 LAN ports into manually created port channel logical interfaces. When configuring Layer 3 EtherChannels, you must manually create the port channel logical interface as described in this section, and then put the Layer 3 LAN ports into the channel group. To create a port channel interface for a Layer 3 EtherChannel, perform this task:


Creates the port channel interface.
Router(config)# interface port-channel group_number
Assigns an IP address and subnet mask to the EtherChannel.
Router(config-if)# ip address ip_address mask
Router(config-if)# end


Configuring Channel Groups
When configuring Layer 3 EtherChannels, you must manually create the port channel logical interface first and then put the Layer 3 LAN ports into the channel group. When configuring Layer 2 EtherChannels, configure the LAN ports with the channel-group command, which automatically creates the port channel logical interface. To configure channel groups, perform this task for each LAN port:


Selects a LAN port to configure

Router(config)# interface interface-id

(Optional) On the selected LAN port, restricts the channel-group command to the EtherChannel protocol configured with the channel-protocol command.
Router(config-if)# channel-protocol (lacp | pagp}
! Configures the LAN port in a port channel and specifies the mode
Router(config-if)# channel-group group_number mode {active | auto | desirable | on | passive}
! (Optional for LACP) Valid values are 1 through 65535. Higher numbers have lower priority. The default is 32768.
Router(config-if)# lacp port-priority priority_value
Router(config-if)# end
! Verifies the configuration.
Router# show interfaces interface-id etherchannel



Configuring the LACP System Priority and System ID
To configure the LACP system priority and system ID, perform this task:
! (Optional for LACP) Valid values are 1 through 65535. Higher numbers have lower priority. The default is 32768.
Router(config)# lacp system-priority priority_value
! Verify
Router# show lacp sys-id


Configuring EtherChannel Load Balancing
To configure EtherChannel load balancing, perform this task:
! Configures the EtherChannel load-balancing method. The method is globally applied to all port channels.
Router(config)# port-channel load-balance {src-mac | dst-mac | src-dst-mac | src-ip | dst-ip | src-dst-ip | src-port | dst-port | src-dst-port} [module slot]
Router(config)# end
! Verifies the configuration.
Router# show etherchannel load-balance



Configuring the EtherChannel Min-Links Feature
To configure the EtherChannel min-links feature, perform this task:
! Selects an LACP port channel interface.
Router(config)# interface port-channel group_number
! Configures the minimum number of member ports that must be in the link-up state and bundled in the EtherChannel for the port
! channel interface to transition to the link-up state.
Router(config-if)# port-channel min-links number
Router(config-if)# end
! Verifies the configuration.
Router# show interfaces interface-id etherchannel



Configuring LACP 1:1 Redundancy
To configure the LACP 1:1 redundancy feature, perform this task:
! Selects an LACP port channel interface.
Router(config)# interface port-channel group_number
! Enables the fast switchover feature for this EtherChannel.
Router(config-if)# lacp fast-switchover
! Sets the maximum number of active member ports to be one.
Router(config-if)# lacp max-bundle 1
Router(config-if)# end