23
3.
VTEP 3 de-encapsulates the ARP request, creates an ARP entry for the user terminal, and
sends an ARP reply to the user terminal.
4.
VTEP 1 forwards the ARP reply to the user terminal.
5.
The user terminal learns the MAC address of the gateway, and sends the Layer 3 traffic to the
gateway.
6.
VTEP 3 removes the VXLAN encapsulation and inner Ethernet header for the traffic, and
forwards the traffic to the destination node.
Inter-VXLAN forwarding is the same as this process except for the last step. At the last step of
inter-VLAN forwarding, the gateway replaces the source-VXLAN encapsulation with the
destination-VXLAN encapsulation, and then forwards the traffic.
Figure 10 Example of centralized VXLAN IP gateway deployment
Distributed VXLAN IP gateway deployment
As shown in
, each site's VTEP acts as a gateway to perform Layer 3 forwarding for the
VXLANs of the local site. A VTEP acts as a border gateway to the Layer 3 network for the VXLANs.
The VTEPs perform Layer 3 forwarding based on ARP or ND entries.
IMPORTANT:
The site-connected gateways are called distributed gateways. On the distributed gateways, you
must enable local proxy ARP (for IPv4 sites) or local ND proxy (for IPv6 sites).
VXLAN tunnel
VTEP 1
VTEP 2
Site 1
Site 2
Terminal
Terminal
Terminal
VSI/VXLAN 10
VSI/VXLAN 20
VSI/VXLAN 30
Terminal
Terminal
Terminal
VSI/VXLAN 10
VSI/VXLAN 20
VSI/VXLAN 30
Transport
network
P
10.1.1.11
20.1.1.11
30.1.1.11
10.1.1.12
20.1.1.12
30.1.1.12
VX
LA
N tu
nne
l
VX
LA
N
tun
ne
l
VTEP 3/Centralized VXLAN IP gateway
VSI/VXLAN 10
VSI/VXLAN 20
VSI/VXLAN 30
VSI-interface10
10.1.1.1/24
VSI-interface20
20.1.1.1/24
VSI-interface30
30.1.1.1/24
L3 network
