1. Lo0
/32
/32
/32
/32
/32
/32
7.7.77/32
/32
/32
Ae0(Trunk)
Ge-0/0/0
Ge-0/0/1
Ge-0/0/2
VLAN 10, 20, 30
Ae0(Trunk)
Ge-0/0/0
Ge-0/0/1
Ge-0/0/2
VLAN 10, 20, 30
L3_1
EX4300
L3_2
EX4300
Irb /24
Irb /24
Irb /24
Irb /24
Irb /24
Irb /24
LAG
No LACP
Ge-0/0/10
/24
/24
ICMP To PC

2. ge-0/0/1 down and delete irb.20 IP in L3_2 Some ICMP can’t reachable
Lo0
/32
/32
/32
/32
/32
/32
7.7.77/32
/32
/32
Ae0(Trunk)
Ge-0/0/0
Ge-0/0/1
Ge-0/0/2
VLAN 10, 20, 30
Ae0(Trunk)
Ge-0/0/0
Ge-0/0/1 Down
Ge-0/0/2
VLAN 10, 20, 30
L3_1
EX4300
L3_2
EX4300
Irb /24
Irb /24
Irb /24
Irb /24
Irb /24
Irb /24
LAG
No LACP
Ge-0/0/10
/24
ge-0/0/1 down and delete irb.20 IP in L3_2
Some ICMP can’t reachable
Is it expected behavior?
/24
ICMP To PC

3. L3_1 Configuration
set chassis aggregated-devices ethernet device-count 1
set interfaces ge-0/0/0 ether-options 802.3ad ae0
set interfaces ge-0/0/1 ether-options 802.3ad ae0
set interfaces ge-0/0/2 ether-options 802.3ad ae0
set interfaces ge-0/0/10 unit 0 family inet address /24
set interfaces ae0 unit 0 family ethernet-switching interface-type trunk
set interfaces ae0 unit 0 family ethernet-switching vlan members [ ]
set interfaces irb unit 10 family inet address /24
set interfaces irb unit 20 family inet address /24
set interfaces irb unit 30 family inet address /24
set routing-options static route /0 next-hop
set routing-options static route /0 next-hop
set routing-options static route /0 next-hop
set routing-options forwarding-table export ECMP
set policy-options policy-statement ECMP then load-balance per-packet
set vlans VLAN10 vlan-id 10
set vlans VLAN10 l3-interface irb.10
set vlans VLAN20 vlan-id 20
set vlans VLAN20 l3-interface irb.20
set vlans VLAN30 vlan-id 30
set vlans VLAN30 l3-interface irb.30

4. L3_2 Configuration
set chassis aggregated-devices ethernet device-count 1
set interfaces ge-0/0/0 ether-options 802.3ad ae0
set interfaces ge-0/0/1 ether-options 802.3ad ae0
set interfaces ge-0/0/2 ether-options 802.3ad ae0
set interfaces ae0 unit 0 family ethernet-switching interface-type trunk
set interfaces ae0 unit 0 family ethernet-switching vlan members [ ]
set interfaces irb unit 10 family inet address /24
set interfaces irb unit 20 family inet address /24
set interfaces irb unit 30 family inet address /24
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set interfaces lo0 unit 0 family inet address /32
set routing-options static route /0 next-hop
set routing-options forwarding-table export ECMP
set policy-options policy-statement ECMP then load-balance per-packet
set vlans VLAN10 vlan-id 10
set vlans VLAN10 l3-interface irb.10
set vlans VLAN20 vlan-id 20
set vlans VLAN20 l3-interface irb.20
set vlans VLAN30 vlan-id 30
set vlans VLAN30 l3-interface irb.30