This article provides an example configuration for LACP on a layer 2 transparent mode Chassis Cluster.

Notes:

• Starting in Junos OS Release 15.1X49-D80, Link Aggregation Control Protocol (LACP) is supported in Layer 2 transparent mode, in addition to existing support in Layer 3 mode on SRX300, SRX320, SRX340, SRX345, SRX1500, SRX4100, SRX4200 devices and vSRX instances. 
• Starting in Junos OS Release 15.1X49-D40 and Junos OS Release 17.3R1, Link Aggregation Control Protocol (LACP) is supported in Layer 2 transparent mode in addition to existing support in Layer 3 mode for SRX5400, SRX5600 and SRX5800 devices.

For more information, refer to Understanding Link Aggregation Control Protocol .

​Topology:

LACP ae1:
SRX (ge-0/0/3) is connected to EX (ge-0/0/0)
SRX (ge-0/0/4) is connected to EX (ge-0/0/2)

LACP ae2:
SRX (ge-5/0/3) is connected to EX (ge-0/0/1)
SRX (ge-5/0/4) is connected to EX (ge-0/0/3)
 

Configuration Example:

EX Config:

set chassis aggregated-devices ethernet device-count 10
set interfaces ge-0/0/0 ether-options 802.3ad ae1
set interfaces ge-0/0/1 ether-options 802.3ad ae2
set interfaces ge-0/0/2 ether-options 802.3ad ae1
set interfaces ge-0/0/3 ether-options 802.3ad ae2
set interfaces ae1 aggregated-ether-options lacp active
set interfaces ae1 aggregated-ether-options lacp periodic slow
set interfaces ae1 unit 0 family ethernet-switching port-mode trunk
set interfaces ae1 unit 0 family ethernet-switching vlan members vlan10
set interfaces ae1 unit 0 family ethernet-switching vlan members vlan40
set interfaces ae2 aggregated-ether-options lacp active
set interfaces ae2 aggregated-ether-options lacp periodic slow
set interfaces ae2 unit 0 family ethernet-switching port-mode trunk
set interfaces ae2 unit 0 family ethernet-switching vlan members vlan10
set interfaces ae2 unit 0 family ethernet-switching vlan members vlan40
set vlans vlan10 vlan-id 10
set vlans vlan40 vlan-id 40

SRX Chassis Cluster:

set interfaces ge-0/0/3 gigether-options redundant-parent reth0
set interfaces ge-0/0/4 gigether-options redundant-parent reth0
set interfaces ge-5/0/3 gigether-options redundant-parent reth0
set interfaces ge-5/0/4 gigether-options redundant-parent reth0
set interfaces irb unit 10 family inet address 192.168.1.254/24
set interfaces reth0 vlan-tagging
set interfaces reth0 redundant-ether-options redundancy-group 1
set interfaces reth0 redundant-ether-options lacp active
set interfaces reth0 redundant-ether-options lacp periodic slow
set interfaces reth0 unit 0 family ethernet-switching interface-mode trunk
set interfaces reth0 unit 0 family ethernet-switching vlan members vlan10
set interfaces reth0 unit 0 family ethernet-switching vlan members vlan40
set protocols l2-learning global-mode transparent-bridge
set vlans vlan10 vlan-id 10
set vlans vlan10 l3-interface irb.10
set vlans vlan40 vlan-id 40

{primary:node0}[edit]
root@SRX345# run show lacp interfaces 
Aggregated interface: reth0
    LACP state:       Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      ge-0/0/3       Actor    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-0/0/3     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-0/0/4       Actor    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-0/0/4     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-5/0/3       Actor    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-5/0/3     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-5/0/4       Actor    No    No   Yes  Yes  Yes   Yes     Slow    Active
      ge-5/0/4     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
    LACP protocol:        Receive State  Transmit State          Mux State 
      ge-0/0/3                  Current   Slow periodic Collecting distributing
      ge-0/0/4                  Current   Slow periodic Collecting distributing
      ge-5/0/3                  Current   Slow periodic Collecting distributing
      ge-5/0/4                  Current   Slow periodic Collecting distributing

2020-06-26: Article reviewed for accuracy; Updated the link in the summary section.

• Understanding Link Aggregation Control Protocol