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# Mesh Topology
# +---------+              +---------+
# | spine01 |              | spine02 |
# +---------+              +---------+
#   |em4   \ em5        em5 /   em4|
#   |        \            /        |
#   |          \        /          |
#   |            \    /            |
#   |              \/              |
#   |             /  \             |
#   |           /      \           |
#   |         /          \         |
#   |em4    / em5      em5 \    em4|
# +---------+              +---------+
# | leaf03  |              | leaf04  |
# +---------+              +---------+

set interfaces lo0 unit 0 family inet address 10.0.0.1/32
set interfaces em3 unit 0 family inet address 192.168.0.0/31
set interfaces em5 unit 0 family inet address 192.168.0.2/31

set protocols ospf area 0.0.0.0 interface em3.0
set protocols ospf area 0.0.0.0 interface em5.0
set protocols ospf area 0.0.0.0 interface lo0.0 passive

...

set protocols bgp log-updown
set protocols bgp import bgp-ipclos-in
set protocols bgp export bgp-ipclos-out
set protocols bgp graceful-restart

set protocols bgp group IPCLOS type external
set protocols bgp group IPCLOS mtu-discovery
set protocols bgp group IPCLOS bfd-liveness-detection minimum-interval 350
set protocols bgp group IPCLOS bfd-liveness-detection multiplier 3
set protocols bgp group IPCLOS bfd-liveness-detection session-mode single-hop
set protocols bgp group IPCLOS multipath multiple-as
set protocols bgp group IPCLOS neighbor 192.168.0.1 peer-as 65200
set protocols bgp group IPCLOS neighbor 192.168.0.3 peer-as 65201
set protocols bgp group IPCLOS neighbor 192.168.0.5 peer-as 65202

...

set policy-options policy-statement bgp-ipclos-in term loopbacks from route-filter 10.0.0.0/24 orlonger
set policy-options policy-statement bgp-ipclos-in term loopbacks then accept
#set policy-options policy-statement bgp-ipclos-in term server-L3-gw from route-filter 172.16.0.0/12 orlonger
#set policy-options policy-statement bgp-ipclos-in term server-L3-gw then accept
set policy-options policy-statement bgp-ipclos-in term reject then reject

...

From the book:   Juniper QFX10000 Series.

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https://github.com/Juniper/vqfx10k-vagrant