Hi all,

today I’m gonna show you how to implement MC-LAG on the vQFX (QFX10k codebase) on EVE-NG. I personally found this pretty straight forward to configure but since I recieved so many Mails asking me to show this, I will do.

Here’s the very simple Topology (click to enlarge):

And here’s the Code – as you can see it’s not that hard but you have to remember some things:

vQFX-RE7
set chassis aggregated-devices ethernet device-count 2
set interfaces xe-0/0/1 ether-options 802.3ad ae0
set interfaces xe-0/0/2 ether-options 802.3ad ae0
set interfaces xe-0/0/0 ether-options 802.3ad ae1
set interfaces ae0 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae0 unit 0 family ethernet-switching vlan members v500
set interfaces ae1 aggregated-ether-options lacp active
set interfaces ae1 aggregated-ether-options lacp system-id 00:01:01:01:01:01
set interfaces ae1 aggregated-ether-options lacp admin-key 1
set interfaces ae1 aggregated-ether-options mc-ae mc-ae-id 1
set interfaces ae1 aggregated-ether-options mc-ae chassis-id 1
set interfaces ae1 aggregated-ether-options mc-ae mode active-active
set interfaces ae1 aggregated-ether-options mc-ae status-control standby
set interfaces ae1 aggregated-ether-options mc-ae init-delay-time 240
set interfaces ae1 aggregated-ether-options mc-ae redundancy-group 1
set interfaces ae1 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae1 unit 0 family ethernet-switching vlan members v100
set interfaces irb unit 500 family inet address 3.3.3.1/24
set vlans v100 vlan-id 100
set vlans v500 vlan-id 500
set vlans v500 l3-interface irb.500
set protocols iccp local-ip-addr 3.3.3.1
set protocols iccp peer 3.3.3.2 redundancy-group-id-list 1
set protocols iccp peer 3.3.3.2 liveness-detection minimum-receive-interval 9000
set protocols iccp peer 3.3.3.2 liveness-detection transmit-interval minimum-interval 9000
set protocols rstp interface ae0 disable
set protocols rstp interface ae0 mode point-to-point
set protocols rstp interface ae1 edge
set protocols rstp interface ae1 mode point-to-point
set protocols rstp bpdu-block-on-edge
set multi-chassis multi-chassis-protection 3.3.3.2 interface ae0
set switch-options service-id 1





vQFX-RE8:
set chassis aggregated-devices ethernet device-count 2
set interfaces xe-0/0/1 ether-options 802.3ad ae0
set interfaces xe-0/0/2 ether-options 802.3ad ae0
set interfaces xe-0/0/0 ether-options 802.3ad ae1
set interfaces ae0 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae0 unit 0 family ethernet-switching vlan members v500
set interfaces ae1 aggregated-ether-options lacp active
set interfaces ae1 aggregated-ether-options lacp system-id 00:01:01:01:01:01
set interfaces ae1 aggregated-ether-options lacp admin-key 1
set interfaces ae1 aggregated-ether-options mc-ae mc-ae-id 1
set interfaces ae1 aggregated-ether-options mc-ae chassis-id 0
set interfaces ae1 aggregated-ether-options mc-ae mode active-active
set interfaces ae1 aggregated-ether-options mc-ae status-control active
set interfaces ae1 aggregated-ether-options mc-ae init-delay-time 240
set interfaces ae1 aggregated-ether-options mc-ae redundancy-group 1
set interfaces ae1 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae1 unit 0 family ethernet-switching vlan members v100
set interfaces irb unit 500 family inet address 3.3.3.2/24
set interfaces irb unit 500 mac 00:00:00:00:00:05
set vlans v100 vlan-id 100
set vlans v500 vlan-id 500
set vlans v500 l3-interface irb.500
set protocols iccp local-ip-addr 3.3.3.2
set protocols iccp peer 3.3.3.1 redundancy-group-id-list 1
set protocols iccp peer 3.3.3.1 liveness-detection minimum-receive-interval 9000
set protocols iccp peer 3.3.3.1 liveness-detection transmit-interval minimum-interval 9000
set protocols rstp interface ae0 disable
set protocols rstp interface ae0 mode point-to-point
set protocols rstp interface ae1 edge
set protocols rstp interface ae1 mode point-to-point
set protocols rstp bpdu-block-on-edge
set multi-chassis multi-chassis-protection 3.3.3.1 interface ae0
set switch-options service-id 1





Server (in this case shown via vQFX-RE):
set vlans v100 vlan-id 100
set vlans v500 vlan-id 500
set interfaces ae0 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae0 unit 0 family ethernet-switching vlan members v500
set interfaces ae0 unit 0 family ethernet-switching vlan members v100
set chassis aggregated-devices ethernet device-count 1
set interfaces xe-0/0/1 ether-options 802.3ad ae0
set interfaces xe-0/0/2 ether-options 802.3ad ae0
set protocols rstp interface ae0 edge
set protocols rstp interface ae0 mode point-to-point

When configuring MC-LAG always remember that the following settings must match on both Members of the MC-LAG:

LACP System-ID + Key
MC-AE ID + Mode
VLAN’s (ICL and Member VLAN’s)

The following settings must be unique for each Member of the MC-LAG:

MC-AE Chassis-ID + Status Control
ICCP IP (Local) and Peer IP (who would have guessed this…)
MC-LAG Protection 

I will give you more explanation on this Topic later because as you might have heard my JNCIE-DC is booked for the 14th of February (therefore not so much time to write detailed Blogposts) and time is slowly running away… Okay just kidding – time just took a SPRINT towards my deadline… However, my beard looks fine so far…

Update 15.02.2019:
It can happen, that your vQFX-Devices all have the same MAC! Therefore (as a workaround) you can set the irb-mac static on one of the MC-LAG “Core” Devices:

set interfaces irb unit 500 mac 00:00:00:00:00:05

This way your MC-LAG will come up as expected 😉