Configure a Dynamic Aggregation Group

Network Requirements

• Device1 is connected to PC1, Device2 is connected to PC2 and PC3, and the three PCs are in the same network segment. Device1 and Device2 are interconnected through Trunk ports.
• A dynamic aggregation group is configured between Device1 and Device2 for bandwidth increase, load sharing, and service backup.

Network Topology

Figure 1-4 Networking for Configuring a Dynamic Aggregation Group

Configuration Steps

Step 1: Create a dynamic aggregation group.

#On Device1, create dynamic aggregation group 1.

#On Device2, create dynamic aggregation group 1.

Step 2: Add ports into the aggregation group.

#On Device1, add ports gigabitethernet0/1 and gigabitethernet0/2 into aggregation group 1 in Active mode.

#On Device2, add ports gigabitethernet0/1 and gigabitethernet0/2 into aggregation group 1 in Active mode.

#After the configuration is completed, check the status of aggregation group 1 on the devices.

Here takes Device1 for example:

Device1#show link-aggregation group 1 
 Link Aggregation 1 
  Type: switchport 
  Mode: LACP 
  User: LAC 
  Description:  
  Peer-description:  
  Load balance profile: default 
  Number of ports in total: 2 
  Number of ports attached: 2 
  Root port: gigabitethernet0/1 
  gigabitethernet0/1: ATTACHED 
  gigabitethernet0/2: ATTACHED 

According to the system display, ports gigabitethernet0/1 and gigabitethernet0/2 on Device1 are both in the ATTACHED state in aggregation group 1, and aggregation of aggregation group 1 is successful.

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  For the method of checking Device2, refer to the method of checking Device1.

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Step 3: Configure the aggregation group to reference the load balance profile.

#On Device1, create the load balance profile linkagg-profile.

#On Device1, configure the packet load hash-key in the load balance profile linkagg- profile, configure the L2 packet to load by the destination MAC, configure the IP packet to load by the destination IP.

#On Device1, configure the load balance profile referenced by aggregation group 1 as linkagg-profile.

# On Device2, create the load balance profile linkagg-profile (omitted).

#On Device2, configure the load hash-key of the packet in the load balance profile linkagg- profile, configure the L2 packet to load by the destination MAC, configure the IP packet to load by the destination IP. (Omitted)

#On Device2, configure the load balance profile referenced by aggregation group 1 as linkagg-profile. (Omitted)

Step 4: Configure a VLAN, and configure the link type of the aggregation group and ports.

#On Device1, create VLAN2, configure the link type of aggregation group 1 to Trunk and allow services of VLAN2 to pass, and set PVID to 2.

#On Device1, configure the link type of port gigabitethernet0/3 to Access and allow services of VLAN2 to pass.

#On Device2, create VLAN2, configure the link type of aggregation group 1 to Trunk and allow services of VLAN2 to pass, and set PVID to 2.(Omitted)

#On Device2, configure the link type of ports gigabitethernet0/3 and gigabitethernet0/4 to Access and allow the services of VLAN2 to pass. (Omitted)

Step 5: Check the result.

#On the devices, check the aggregated bandwidth of aggregation group 1. Take Device1 for example:

Device1#show interface link-aggregation 1 
link-aggregation 1 configuration information 
        Description        :  
        Peer-description   : 
        Status             : Enabled 
        Link               : Up 
        Act Speed          : 2000 
        Act Duplex         : Full 
        Port Type          : Nni 
        Pvid               : 2 

According to the system display, the interface bandwidth of the aggregation group on Device1 is 2000 M.

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  For the method of checking Device2, refer to the method of checking Device1.

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#After configuration, view the configured load balance profile on Device1.

Device1#show load-balance configuration   
  Profile:default 
        Configuration Valid currently: 
                L2: src-mac dst-mac 
                Ip: src-ip dst-ip 
        Configuration Valid-pending to be applied: 
                L2: 
                Ip: 
        Configuration Invalid-pending to be applied: 
                L2: 
                Ip: Profile:linkagg-profile 
        Configuration Valid currently: 
                L2: dst-mac 
                Ip: dst-ip 
        Configuration Valid-pending to be applied: 
                L2: 
                Ip: 
        Configuration Invalid-pending to be applied: 
                L2: 
                Ip: 

#After the configuration is completed, check the current load balancing profile on Device1.

Device1#show link-aggregation group 1 
 Link Aggregation 1 
  Type: switchport 
  Mode: LACP 
  User: LAC 
  Description: 
  Peer-description : 
  Load balance profile: linkagg-profile 
  Number of ports in total: 2 
  Number of ports attached: 2 
  Root port: gigabitethernet0/1 
  gigabitethernet0/1: ATTACHED 
  gigabitethernet0/2: ATTACHED

According to the system display, the current load balancing profile referenced by aggregation group 1 is linkagg-profile.

#During the process of service interaction between PC1 and PC2 and PC3, load balancing of data is achieved on the aggregated links. If a link in the aggregation group becomes faulty, the other links provide service backup.