Link Aggregation Group

  • Updated on Sep 3, 2024
  • Published on Jul 28, 2021
  • 2 minute(s) read
  • Jonathan Poole
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This article describes how to configure and enable Link Aggregation.

Note: To log in, enter your username (default is root) and password (default is admin123).

Configuration Guidelines

The guidelines for the configuration of Link Aggregation are as follows:

  • Port-channel must be enabled in the system for Link aggregation configuration to take effect.
  • If 802.1x is enabled on a port, then Link Aggregation can be enabled on that port only when the port is in the authorized state. Link Aggregation cannot be enabled on unauthorized ports.

Default Configurations

Feature Default Setting
Port-channel Disabled
Channel-groups None
LACP System Priority 0x8000 or 32768
Load balancing Source and Destination MAC address based
LACP Port Priority 128 on all interfaces
LACP Wait time 2
LACP timeout long: The long timeout value means that LACP PDU is expected every 30 seconds (LACP packets to be received every 30 seconds) and LACP timeout value (no packet is received from the peer) is 90 seconds
MAC-selection dynamic: Port-channel MAC address is the address of an active port

Enabling Link Aggregation

Link Aggregation is disabled by default.

To enable Link Aggregation

  1. Create port channel and configure it as providerNetworkport with TPID configured.
    Note: Supported TPID 0x8100, 0x9100, 0x88a8.
Your Product# configure terminal
Your Product(config)# no shutdown port-channel
Your Product(config)# interface port-channel 40
Your Product(config-if)# bridge port-type providerNetworkPort
Your Product(config-if)# switchport egress ether-type 0x88a8
Your Product(config-if)# switchport egress inner-ether-type 0x8100
Your Product(config-if)# no shutdown
Your Product(config-if)# end
Your Product#
  1. Execute the following commands in both switches to enable Link Aggregation.
  • Enter the Global Configuration mode.
Your Product# configure terminal
  • Enable port channel.
Your Product(config)# set port-channel enable
  • Exit from the Global configuration mode.
Your Product(config)# end
  1. Map physical member port to port-channel interface.
Your Product# configure terminal
Your Product(config)# interface xl-ethernet 0/1
Your Product(config-if)# channel-group 40 mode on
Your Product(config-if)# no shutdown
Your Product(config-if)# end
Your Product# configure terminal
Your Product(config)# interface xl-ethernet 0/2
Your Product(config-if)# channel-group 40 mode on
Your Product(config-if)# no shutdown
Your Product(config-if)# end
  1. Configure the Maximum member port count for port-channel.
Your Product# configure terminal
Your Product(config)# interface port-channel 40 
Your Product(config-if)# port-channel max-ports 2
Your Product(config-if)# end 
Your Product#

Note: This has to be set as "1", for 1:1 Active : Active Lag.

5. View the etherchannel information using the following command.

Your Product# show etherchannel summary

The output in Switch A and Switch B is:

Port-channel Module Admin Status is enabled
Port-channel Module Oper Status is enabled
Port-channel Independent mode is disabled
Port-channel System Identifier is 00:01:02:03:04:05

Note: The following command is used to shut down the entire LA module: Your Product(config)# shutdown port-channel.

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