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BGP configuration considerations:
- subdivide single "public" AS (100) into multiple internal sub-AS (BGP confederation)
- spine layer: all switches reside in one AS (65000)
- leaf layer: every switch resides in its own AS (65001, 65002, 65003, 65004)
- direct static peering between leaf and spine nodes (interfaces of interconnection network, no loopbacks)
- allow load balancing across multiple BGP paths with equal costs (=> ECMP)
- maximum path count equals number of used spine switches
- only one AS at spine layer => no BGP multipath relaxing necessary
- every BGP router is used as next hop in its advertised/forwarded routing messages
ip subnet for l3-switch interconnection networks: 10.20.30.0/27
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10.20.30.0/30 veos-leaf-1 <> veos-spine-1
.1 veos-spine-1 Ethernet1
.2 veos-leaf-1 Ethernet1
10.20.30.4/30 veos-leaf-1 <> veos-spine-2
.5 veos-spine-2 Ethernet1
.6 veos-leaf-1 Ethernet2
10.20.30.8/30 veos-leaf-2 <> veos-spine-1
.9 veos-spine-1 Ethernet2
.10 veos-leaf-2 Ethernet1
10.20.30.12/30 veos-leaf-2 <> veos-spine-2
.13 veos-spine-2 Ethernet2
.14 veos-leaf-2 Ethernet2
10.20.30.16/30 veos-leaf-3 <> veos-spine-1
.17 veos-spine-1 Ethernet3
.18 veos-leaf-3 Ethernet1
10.20.30.20/30 veos-leaf-3 <> veos-spine-2
.21 veos-spine-2 Ethernet3
.22 veos-leaf-3 Ethernet2
10.20.30.24/30 veos-leaf-4 <> veos-spine-1
.25 veos-spine-1 Ethernet4
.26 veos-leaf-4 Ethernet1
10.20.30.28/30 veos-leaf-4 <> veos-spine-2
.29 veos-spine-2 Ethernet4
.30 veos-leaf-4 Ethernet2
l3-switch networks/ip subnets:
(advertised using BGP)
-------------------------------------------------
veos-leaf-1
172.23.24.0/24
veos-leaf-1 Ethernet3 172.23.24.1
lxc-iperf-1 172.23.24.10
veos-leaf-2
172.23.25.0/24
veos-leaf-2 Ethernet3 172.23.25.1
lxc-iperf-2 172.23.25.10
veos-leaf-3
172.23.26.0/24
veos-leaf-3 Ethernet3 172.23.26.1
lxc-iperf-3 172.23.26.10
veos-leaf-4
172.23.27.0/24
veos-leaf-4 Ethernet3 172.23.27.1
lxc-iperf-4 172.23.27.10