Let's check the output of our Nexus Switch with whom we are going to create BGP neighbourship with ACI.
n9k# show run | section bgp
feature bgp
router bgp 369
address-family ipv4 unicast
vrf BGP
address-family ipv4 unicast
network 101.101.101.1/32 ← Advitised to neighbour (Leaf5)
neighbor 222.222.221.1
remote-as 963
address-family ipv4 unicast
2) Let's see the interface output which is connected to leaf switch
interface Ethernet1/25 (It is connected to port 15 of leaf5)
no switchport
vrf member BGP
ip address 222.222.221.2/24
no shutdown
interface loopback 101
vrf member BGP
ip address 101.101.101.1/32
3) Now let's configure BGP on ACI as L3Out
4) Let's check output on Leaf switch which is forming neighborship with Nexus Switch
leaf5# show ip bgp summary vrf ISP:VRF-ISP
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
222.222.221.2 4 369 10 9 141 0 0 00:05:42 1
leaf5# show ip route bgp vrf ISP:VRF-ISP
101.101.101.1/32, ubest/mbest: 1/0
*via 222.222.221.2%ISP:VRF-ISP, [20/0], 00:05:23, bgp-963, external, tag 369
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