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The configuration for Router 1 is show shown below. The first part of the configuration deals with physical interfaces and assigning VLANs to these interfaces. Router 1 has three physical interfaces configured, two interfaces connecting server 1 and server 3. The MTU value of layer 3 interfaces is set to 1450 to ensure there is enough space for the overlay VXLAN header. The switch will complain and refuse to commit the configuration if MTU size is not set to 1450.
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Configuration of Router 2 is shown below. Router 2 also has 3 physical interfaces configured with two interfaces connecting server 2 and server 4. The configuration of Router 2 is almost identical to Router 1 other than the basic configurations like VXLAN VNI and interface IP addresses.
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admin@router2# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 100 admin@router2# set interface gigabit-ethernet ge-1/1/2 disable true admin@router2# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 2221 admin@router2# set interface gigabit-ethernet ge-1/1/10 family ethernet-switching native-vlan-id 1111 admin@router2# set interface gigabit-ethernet ge-1/1/10 family ethernet-switching port-mode "trunk" admin@router2# set interface gigabit-ethernet ge-1/1/10 family ethernet-switching vlan members 2221 admin@router2# set interface gigabit-ethernet ge-1/1/10 family ethernet-switching vlan members 2222 admin@router2# set interface gigabit-ethernet ge-1/1/11 family ethernet-switching native-vlan-id 2222 admin@router2# set interface gigabit-ethernet ge-1/1/11 family ethernet-switching port-mode "trunk" admin@router2# set interface gigabit-ethernet ge-1/1/11 family ethernet-switching vlan members 3333 admin@router2# set l3-interface loopback address 134.134.134.134 prefix-length 32 admin@router2# set l3-interface vlan-interface vlan2221 vrf "vrf1" admin@router2# set l3-interface vlan-interface vlan2221 mtu 1450 admin@router2# set l3-interface vlan-interface vlan2221 address 21.1.1.134 prefix-length 24 admin@router2# set l3-interface vlan-interface vlan100 mtu 1450 admin@router2# set l3-interface vlan-interface vlan100 address 100.1.1.134 prefix-length 24 admin@router2# set l3-interface vlan-interface vlan100 address 100::134 prefix-length 64 admin@router2# set l3-interface vlan-interface vlan3333 vrf "vrf1" admin@router2# set l3-interface vlan-interface vlan3333 mtu 1450 admin@router2# set l3-interface vlan-interface vlan3333 address 33.1.1.134 prefix-length 24 admin@router2# set l3-interface vlan-interface vlan1111 vrf "vrf1" admin@router2# set l3-interface vlan-interface vlan1111 mtu 1450 admin@router2# set ip routing enable true admin@router2# set ip vrf vrf1 admin@router2# set ip vrf vrf2 admin@router2# set evpn vrf vrf1 vni 9999 admin@router2# set protocols bgp local-as 134 admin@router2# set protocols bgp router-id 134.134.134.134 admin@router2# set protocols bgp peer-group fabric remote-as "external" admin@router2# set protocols bgp neighbor 100.1.1.201 peer-group "fabric" admin@router2# set protocols bgp ipv4-unicast network 134.134.134.134/32 admin@router2# set protocols bgp evpn advertise-all-vni admin@router2# set protocols bgp evpn peer-group fabric activate admin@router2# set protocols bgp vrf vrf1 local-as 134 admin@router2# set protocols bgp vrf vrf1 router-id 134.134.134.134 admin@router2# set protocols bgp vrf vrf1 ipv4-unicast network 33.1.1.0/24 admin@router2# set protocols bgp vrf vrf1 evpn advertise ipv4-unicast admin@router2# set vlans vlan-id 100 l3-interface "vlan100" admin@router2# set vlans vlan-id 1111 l3-interface "vlan1111" admin@router2# set vlans vlan-id 2221 l3-interface "vlan2221" admin@router2# set vlans vlan-id 2222 l3-interface "vlan2222" admin@router2# set vlans vlan-id 3333 l3-interface "vlan3333" admin@router2# set vxlans source-interface lo address 134.134.134.134 admin@router2# set vxlans vni-map-vlan true admin@router2# set vxlans vni 9999 vlan 1111 admin@router2# set vxlans vni 22221 vlan 2221 admin@router2# set vxlans vni 22222 vlan 2222 admin@router2# set vxlans vni 33333 vlan 3333 |
ARP and Neighbor Discovery (ND) Suppression
By default, the ARP and Neighbor Discovery (ND) suppression is not enabled. To enable ARP and ND suppression to control flooding caused by these two protocols, run the command set vxlans vni 22222 arp-nd-suppress disable false.
EVPN MAC Learning Process
Traditionally, MAC address learning in VXLANs is achieved through flooding. In EVPN where BGP is used as the control plane for VXLANs, the problem of flooding can be eliminated through EVPN Type-2 advertisement between VTEPs. In Figure 2, when Host 1 is first plugged into R1, Host 1 will start sending ARP and other basic networking packets like DHCP. When R1 recives a packet from Host 1 for the first time, it will record its MAC in its local MAC address table.
Packet Forwarding Process
Verifying Configuration
To check the BGP state and neighbor status on Router 2, we will run the run show bgp neighbor command.
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