Example for Configuring Link Aggregation in LACP Mode
Networking Requirements
In Figure 3-26, SwitchA and SwitchB connect to devices in VLAN 10 and VLAN 20 through Ethernet links, and heavy traffic is transmitted between SwitchA and SwitchB. The customer hopes that SwitchA and SwitchB can provide increased link bandwidth to enable inter-VLAN communication. Link aggregation in LACP mode can be configured on SwitchA and SwitchB to improve the bandwidth and reliability. The requirements are as follows:
Two active links provide load balancing.
One link functions as the backup link. When a fault occurs on an active link, the backup link replaces the faulty link to maintain reliable data transmission.
Devices in the same VLAN can communicate.
Configuration Roadmap
The configuration roadmap is as follows:
Create an Eth-Trunk and configure the Eth-Trunk to work in LACP mode to implement link aggregation.
Add member interfaces to the Eth-Trunk.
Set the LACP system priority and determine which device is the Actor. The Partner device selects active interfaces based on the interface priorities of the Actor.
Set the upper threshold for the number of active interfaces to improve reliability.
Set LACP interface priorities and determine active interfaces so that interfaces with higher priorities are selected as active interfaces.
Create VLANs and add interfaces to the VLANs.
Procedure
- Create Eth-Trunk 1 on SwitchA and configure Eth-Trunk 1 to work in LACP mode. The configuration
for SwitchB is the same
as that for SwitchA.
<HUAWEI> system-view [HUAWEI] sysname SwitchA [SwitchA] interface eth-trunk 1 [SwitchA-Eth-Trunk1] mode lacp [SwitchA-Eth-Trunk1] quit
- Add member interfaces to Eth-Trunk 1 on SwitchA. The configuration for SwitchB is the same as that for SwitchA.
[SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] eth-trunk 1 [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] eth-trunk 1 [SwitchA-GigabitEthernet1/0/2] quit [SwitchA] interface gigabitethernet 1/0/3 [SwitchA-GigabitEthernet1/0/3] eth-trunk 1 [SwitchA-GigabitEthernet1/0/3] quit
- Set the system priority on SwitchA to 100 so that SwitchA becomes the Actor.
[SwitchA] lacp priority 100 - On SwitchA,
set the upper threshold for the number of active interfaces to 2.
[SwitchA] interface eth-trunk 1 [SwitchA-Eth-Trunk1] max active-linknumber 2 [SwitchA-Eth-Trunk1] quit
- Set the LACP interface priority and determine active links
on SwitchA.
[SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] lacp priority 100 [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] lacp priority 100 [SwitchA-GigabitEthernet1/0/2] quit
- Create VLANs and add interfaces to the VLANs.
# Create VLAN 10 and VLAN 20 and add interfaces to VLAN 10 and VLAN 20. The configuration for SwitchB is the same as that for SwitchA.
[SwitchA] vlan batch 10 20 [SwitchA] interface gigabitethernet 1/0/4 [SwitchA-GigabitEthernet1/0/4] port link-type trunk [SwitchA-GigabitEthernet1/0/4] port trunk allow-pass vlan 10 [SwitchA-GigabitEthernet1/0/4] quit [SwitchA] interface gigabitethernet 1/0/5 [SwitchA-GigabitEthernet1/0/5] port link-type trunk [SwitchA-GigabitEthernet1/0/5] port trunk allow-pass vlan 20 [SwitchA-GigabitEthernet1/0/5] quit
# Configure Eth-Trunk 1 to allow packets from VLAN 10 and VLAN 20 to pass through. The configuration for SwitchB is the same as that for SwitchA.
[SwitchA] interface eth-trunk 1 [SwitchA-Eth-Trunk1] port link-type trunk [SwitchA-Eth-Trunk1] port trunk allow-pass vlan 10 20 [SwitchA-Eth-Trunk1] quit
- Verify the configuration.
# Check information about the Eth-Trunk of the switches and check whether negotiation is successful on the link.
[SwitchA] display eth-trunk 1 Eth-Trunk1's state information is: Local: LAG ID: 1 WorkingMode: LACP Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP System Priority: 100 System ID: 00e0-fca8-0417 Least Active-linknumber: 1 Max Active-linknumber: 2 Operate status: up Number Of Up Port In Trunk: 2 -------------------------------------------------------------------------------- ActorPortName Status PortType PortPri PortNo PortKey PortState Weight GigabitEthernet1/0/1 Selected 1GE 100 6145 2865 11111100 1 GigabitEthernet1/0/2 Selected 1GE 100 6146 2865 11111100 1 GigabitEthernet1/0/3 Unselect 1GE 32768 6147 2865 11100000 1 Partner: -------------------------------------------------------------------------------- ActorPortName SysPri SystemID PortPri PortNo PortKey PortState GigabitEthernet1/0/1 32768 00e0-fca6-7f85 32768 6145 2609 11111100 GigabitEthernet1/0/2 32768 00e0-fca6-7f85 32768 6146 2609 11111100 GigabitEthernet1/0/3 32768 00e0-fca6-7f85 32768 6147 2609 11110000
[SwitchB] display eth-trunk 1 Eth-Trunk1's state information is: Local: LAG ID: 1 WorkingMode: LACP Preempt Delay: Disabled Hash arithmetic: According to SIP-XOR-DIP System Priority: 32768 System ID: 00e0-fca6-7f85 Least Active-linknumber: 1 Max Active-linknumber: 8 Operate status: up Number Of Up Port In Trunk: 2 -------------------------------------------------------------------------------- ActorPortName Status PortType PortPri PortNo PortKey PortState Weight GigabitEthernet1/0/1 Selected 1GE 32768 6145 2609 11111100 1 GigabitEthernet1/0/2 Selected 1GE 32768 6146 2609 11111100 1 GigabitEthernet1/0/3 Unselect 1GE 32768 6147 2609 11100000 1 Partner: -------------------------------------------------------------------------------- ActorPortName SysPri SystemID PortPri PortNo PortKey PortState GigabitEthernet1/0/1 100 00e0-fca8-0417 100 6145 2865 11111100 GigabitEthernet1/0/2 100 00e0-fca8-0417 100 6146 2865 11111100 GigabitEthernet1/0/3 100 00e0-fca8-0417 32768 6147 2865 11110000
The preceding information shows that the LACP system priority value of SwitchA is 100, which means it has a higher LACP system priority than SwitchB. Member interfaces GigabitEthernet1/0/1 and GigabitEthernet1/0/2 are the active interfaces and are in Selected state. Interface GigabitEthernet1/0/3 is in Unselect state. Two links are active and work in load balancing mode, and one link is the backup link.
Configuration Files
SwitchA configuration file
# sysname SwitchA # vlan batch 10 20 # lacp priority 100 # interface Eth-Trunk1 port link-type trunk port trunk allow-pass vlan 10 20 mode lacp max active-linknumber 2 # interface GigabitEthernet1/0/1 eth-trunk 1 lacp priority 100 # interface GigabitEthernet1/0/2 eth-trunk 1 lacp priority 100 # interface GigabitEthernet1/0/3 eth-trunk 1 # interface GigabitEthernet1/0/4 port link-type trunk port trunk allow-pass vlan 10 # interface GigabitEthernet1/0/5 port link-type trunk port trunk allow-pass vlan 20 # return
SwitchB configuration file
# sysname SwitchB # vlan batch 10 20 # interface Eth-Trunk1 port link-type trunk port trunk allow-pass vlan 10 20 mode lacp # interface GigabitEthernet1/0/1 eth-trunk 1 # interface GigabitEthernet1/0/2 eth-trunk 1 # interface GigabitEthernet1/0/3 eth-trunk 1 # interface GigabitEthernet1/0/4 port link-type trunk port trunk allow-pass vlan 10 # interface GigabitEthernet1/0/5 port link-type trunk port trunk allow-pass vlan 20 # return
