Another Arista VXLAN/EVPN lab but for this we will use eBGP Unnumbered for the underlay rather than OSPF. BGP Unnumbered uses IPv6 link local addresses for IPv4 next hops and is detailed in RFC5549.
https://datatracker.ietf.org/doc/html/rfc5549
Spine1
hostname spine1
interface Ethernet1
no switchport
ipv6 enable
interface Ethernet2
no switchport
ipv6 enable
interface Ethernet3
no switchport
ipv6 enable
interface Loopback0
ip address 5.5.5.5/32
ip routing
ipv6 unicast-routing
router bgp 65400
router-id 5.5.5.5
no bgp default ipv4-unicast
neighbor LEAF peer group
neighbor LEAF local-as 65401 no-prepend replace-as
neighbor LEAF_OL peer group
neighbor LEAF_OL remote-as 65400
neighbor LEAF_OL update-source Loopback0
neighbor LEAF_OL route-reflector-client
neighbor LEAF_OL send-community extended
neighbor 7.7.7.7 peer group LEAF_OL
neighbor 8.8.8.8 peer group LEAF_OL
neighbor 9.9.9.9 peer group LEAF_OL
redistribute connected
neighbor interface Et1 peer-group LEAF remote-as 65403
neighbor interface Et2 peer-group LEAF remote-as 65404
neighbor interface Et3 peer-group LEAF remote-as 65405
address-family evpn
neighbor LEAF_OL activate
address-family ipv4
neighbor LEAF activate
neighbor LEAF next-hop address-family ipv6 originateSpine2
hostname spine2
interface Ethernet1
switchport
ipv6 enable
interface Ethernet2
no switchport
ipv6 enable
interface Ethernet3
no switchport
ipv6 enable
interface Loopback0
ip address 6.6.6.6/32
ip routing
ipv6 unicast-routing
router bgp 65400
router-id 6.6.6.6
no bgp default ipv4-unicast
neighbor LEAF peer group
neighbor LEAF local-as 65402 no-prepend replace-as
neighbor LEAF_OL peer group
neighbor LEAF_OL remote-as 65400
neighbor LEAF_OL update-source Loopback0
neighbor LEAF_OL route-reflector-client
neighbor LEAF_OL send-community extended
neighbor 7.7.7.7 peer group LEAF_OL
neighbor 8.8.8.8 peer group LEAF_OL
neighbor 9.9.9.9 peer group LEAF_OL
redistribute connected
neighbor interface Et1 peer-group LEAF remote-as 65403
neighbor interface Et2 peer-group LEAF remote-as 65404
neighbor interface Et3 peer-group LEAF remote-as 65405
address-family evpn
neighbor LEAF_OL activate
address-family ipv4
neighbor LEAF activate
neighbor LEAF next-hop address-family ipv6 originateLeaf1
hostname leaf1
vlan 1234
interface Ethernet1
no switchport
ipv6 enable
interface Ethernet2
no switchport
ipv6 enable
interface Ethernet3
switchport access vlan 1234
interface Loopback0
ip address 7.7.7.7/32
interface Vxlan1
vxlan source-interface Loopback0
vxlan udp-port 4789
vxlan vlan 1234 vni 1234
ip routing
ipv6 unicast-routing
router bgp 65400
router-id 7.7.7.7
no bgp default ipv4-unicast
neighbor SPINE peer group
neighbor SPINE local-as 65403 no-prepend replace-as
neighbor 5.5.5.5 remote-as 65400
neighbor 5.5.5.5 update-source Loopback0
neighbor 5.5.5.5 send-community extended
neighbor 6.6.6.6 remote-as 65400
neighbor 6.6.6.6 update-source Loopback0
neighbor 6.6.6.6 send-community extended
redistribute connected
neighbor interface Et1 peer-group SPINE remote-as 65401
neighbor interface Et2 peer-group SPINE remote-as 65402
!
vlan 1234
rd 8.8.8.8:1234
route-target both 65400:1234
redistribute learned
!
address-family evpn
neighbor 5.5.5.5 activate
neighbor 6.6.6.6 activate
!
address-family ipv4
neighbor SPINE activate
neighbor SPINE next-hop address-family ipv6 originate
no neighbor 5.5.5.5 activate
no neighbor 6.6.6.6 activateLeaf2
hostname leaf2
vlan 1234,2468
interface Ethernet1
no switchport
ipv6 enable
interface Ethernet2
no switchport
ipv6 enable
interface Ethernet3
switchport access vlan 1234
interface Ethernet4
switchport access vlan 2468
interface Loopback0
ip address 8.8.8.8/32
interface Vxlan1
vxlan source-interface Loopback0
vxlan udp-port 4789
vxlan vlan 1234 vni 1234
vxlan vlan 2468 vni 2468
ip routing
ipv6 unicast-routing
router bgp 65400
router-id 8.8.8.8
no bgp default ipv4-unicast
neighbor SPINE peer group
neighbor SPINE local-as 65404 no-prepend replace-as
neighbor 5.5.5.5 remote-as 65400
neighbor 5.5.5.5 update-source Loopback0
neighbor 5.5.5.5 send-community extended
neighbor 6.6.6.6 remote-as 65400
neighbor 6.6.6.6 update-source Loopback0
neighbor 6.6.6.6 send-community extended
redistribute connected
neighbor interface Et1 peer-group SPINE remote-as 65401
neighbor interface Et2 peer-group SPINE remote-as 65402
vlan 1234
rd 8.8.8.8:1234
route-target both 65400:1234
redistribute learned
vlan 2468
rd 8.8.8.8:2468
route-target both 65400:2468
redistribute learned
address-family evpn
neighbor 5.5.5.5 activate
neighbor 6.6.6.6 activate
address-family ipv4
neighbor SPINE activate
neighbor SPINE next-hop address-family ipv6 originate
no neighbor 5.5.5.5 activate
no neighbor 6.6.6.6 activateLeaf3
hostname leaf3
vlan 2468
interface Ethernet1
no switchport
ipv6 enable
interface Ethernet2
no switchport
ipv6 enable
interface Ethernet4
switchport access vlan 2468
interface Loopback0
ip address 9.9.9.9/32
interface Vxlan1
vxlan source-interface Loopback0
vxlan udp-port 4789
vxlan vlan 2468 vni 2468
ip routing
ipv6 unicast-routing
router bgp 65400
router-id 9.9.9.9
no bgp default ipv4-unicast
neighbor SPINE peer group
neighbor SPINE local-as 65405 no-prepend replace-as
neighbor 5.5.5.5 remote-as 65400
neighbor 5.5.5.5 update-source Loopback0
neighbor 5.5.5.5 send-community extended
neighbor 6.6.6.6 remote-as 65400
neighbor 6.6.6.6 update-source Loopback0
neighbor 6.6.6.6 send-community extended
redistribute connected
neighbor interface Et1 peer-group SPINE remote-as 65401
neighbor interface Et2 peer-group SPINE remote-as 65402
vlan 2468
rd 8.8.8.8:2468
route-target both 65400:2468
redistribute learned
address-family evpn
neighbor 5.5.5.5 activate
neighbor 6.6.6.6 activate
address-family ipv4
neighbor SPINE activate
neighbor SPINE next-hop address-family ipv6 originate
no neighbor 5.5.5.5 activate
no neighbor 6.6.6.6 activate
VPCs 6 & 8 have been configured with IP addresses in the range 10.1.1.0/24 & VPCs 7 & 9 have addresses with the range 10.2.2.0/24. Both are able to ping their relevant counterpart in the same subnet. Also, BGP shows the relevant routes/MAC addresses have been learnt.
