Example for Configuring LLDP on a Network with Link Aggregation Configured

Networking Requirements

As shown in Figure 1, SwitchA and SwitchB are connected through an Eth-Trunk; the NMS has reachable routes to SwitchA and SwitchB; SNMP is configured on devices and NMS.

A network administrator wants to obtain Layer 2 information about SwitchA and SwitchB to know details about network topology and configuration conflicts. The LLDP function can meet the network administrator's requirement.

Figure 1 Network with link aggregation configured

Configuration Roadmap

The configuration roadmap is as follows:

Add physical interfaces on SwitchA and SwitchB to the Eth-Trunk.
Enable global LLDP on SwitchA and SwitchB.

Procedure

Add physical interfaces on SwitchA and SwitchB to the Eth-Trunk.

# Configure SwitchA.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 100
[SwitchA] interface eth-trunk 1
[SwitchA-Eth-Trunk1] trunkport gigabitethernet 0/0/1
[SwitchA-Eth-Trunk1] trunkport gigabitethernet 0/0/2
[SwitchA-Eth-Trunk1] trunkport gigabitethernet 0/0/3
[SwitchA-Eth-Trunk1] port link-type trunk
[SwitchA-Eth-Trunk1] port trunk allow-pass vlan 100
[SwitchA-Eth-Trunk1] quit

# Configure SwitchB.

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] vlan batch 100
[SwitchB] interface eth-trunk 1
[SwitchB-Eth-Trunk1] trunkport gigabitethernet 0/0/1
[SwitchB-Eth-Trunk1] trunkport gigabitethernet 0/0/2
[SwitchB-Eth-Trunk1] trunkport gigabitethernet 0/0/3
[SwitchB-Eth-Trunk1] port link-type trunk
[SwitchB-Eth-Trunk1] port trunk allow-pass vlan 100
[SwitchB-Eth-Trunk1] quit

Enable global LLDP on SwitchA and SwitchB.
# Configure SwitchA.
```
[SwitchA] lldp enable
```
# Configure SwitchB.
```
[SwitchB] lldp enable
```

Verify the configurations.

Check the SwitchA configuration.

# Check whether the physical interfaces have been added to Eth-Trunk1.

[SwitchA] display eth-trunk 1
Eth-Trunk1's state information is:                                             
WorkingMode: NORMAL         Hash arithmetic: According to SIP-XOR-DIP         
Least Active-linknumber: 1  Max Bandwidth-affected-linknumber: 8                
Operate status: up          Number Of Up Port In Trunk: 3                       
--------------------------------------------------------------------------------
PortName                      Status      Weight                                
GigabitEthernet0/0/1          Up          1                                     
GigabitEthernet0/0/2          Up          1                                     
GigabitEthernet0/0/3          Up          1

# Check neighbor information for SwitchA.

[SwitchA] display lldp neighbor brief
Local Intf   Neighbor Dev             Neighbor Intf             Exptime(s)         
GE0/0/1      SwitchB                  GE0/0/1                   115         
GE0/0/2      SwitchB                  GE0/0/2                   115
GE0/0/3      SwitchB                  GE0/0/3                   115

Check the SwitchB configuration.

Refer to the steps for checking SwitchA.

Configuration Files

SwitchA configuration file

#
sysname SwitchA
#
vlan batch 100
#
lldp enable
#
interface Eth-Trunk1
 port link-type trunk                                                           
 port trunk allow-pass vlan 100
#
interface GigabitEthernet0/0/1
 eth-trunk 1
#
interface GigabitEthernet0/0/2 
 eth-trunk 1
#
interface GigabitEthernet0/0/3
 eth-trunk 1
#
return

SwitchB configuration file

#
sysname SwitchB
#
vlan batch 100
#
lldp enable
#
interface Eth-Trunk1
 port link-type trunk                                                           
 port trunk allow-pass vlan 100
#
interface GigabitEthernet0/0/1
 eth-trunk 1
#
interface GigabitEthernet0/0/2 
 eth-trunk 1
#
interface GigabitEthernet0/0/3
 eth-trunk 1
#
return