Posts tagged lacp

Juniper: bonding / LACP switchconfig
posted on 2015-12-01 08:28:56

This is a rough copy-paste howto, after having accessed the switch and having changed into configure mode via edit:

activate LACP

set interfaces ae1 aggregated-ether-options lacp active
set interfaces ae1 aggregated-ether-options lacp periodic fast

create the virtual bonding interface aeX

set interfaces ae1 unit 0 description <SERVER-NAME>
set interfaces ae1 unit 0 family ethernet-switching vlan members <VLAN-NAME>

unset via delete first, else just map physical nic to virtual interface

# for port 14 / 15
set interfaces ge-0/0/14 ether-options 802.3ad ae1
set interfaces ge-0/0/15 ether-options 802.3ad ae1

This assumes that the only existing ae / "aggregated ethernet" interface was ae0 prior. Thus ae1 was chosen.

amount of aggregated devices

Check how many are already configured:

admin@switch-01# show chassis 
aggregated-devices {
    ethernet {
        device-count 1;
alarm {
    management-ethernet {
        link-down ignore;


There you can see that only one ae interface existed prior.

Increase this counter:

set chassis aggregated-devices ethernet device-count 2

This should be everything, commit and-quit and your config is live.

Don't forget to put the VLAN onto your uplink (ae0?) interface, too, so it can get handed to your core.

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