Connectivity Guide

VXLAN virtual network VTEP Virtual-network IP address Anycast gateway IP address
VNI 11 VTEP 1
VTEP 2
VTEP 3
10.10.1.201
10.10.1.202
10.10.1.203
10.10.1.254
10.10.1.254
10.10.1.254
VNI 12 VTEP 1
VTEP 2
VTEP 3
10.20.1.201
10.20.1.202
10.20.1.203
10.20.1.254
10.20.1.254
10.20.1.254
VNI 13 VTEP 1
VTEP 2
VTEP 3
10.30.1.201
10.30.1.202
10.30.1.203
10.30.1.254
10.30.1.254
10.30.1.254
1 As a best practice, create a non-default VRF instance for overlay routing in Conguration mode. For multi-tenancy, create additional
VRF instances.
ip vrf tenant-vrf-name
exit
2 Congure the MAC address of an anycast Layer 3 gateway in Conguration mode. This is a global MAC address that is shared by all
anycast gateway IP addresses on all VTEPs in all VXLAN virtual networks.
ip virtual-router mac-address mac-address
3 Congure a virtual-network router interface, assign it to the tenant VRF, and congure an IP address. Then enable the interface. The
virtual-network IP address must be unique on each VTEP, including VTEPs in VLT pairs and for dierent VXLAN virtual networks
congured on the same VTEP. .
interface virtual-network vn-id
ip vrf forwarding tenant-vrf-name
ip address ip-address
no shutdown
exit
4 Congure an anycast gateway IP address for each VXLAN virtual network in VIRTUAL-NETWORK mode. Congure the same IP
address on all VTEPs in the same virtual network. Each VXLAN virtual network must use a unique anycast gateway IP address. The
anycast gateway IP address is used as the default gateway IP address even if host VMs move from one VTEP to another in a VXLAN.
virtual-network vn-id
ip virtual-router address ip-address
Advertise the VXLAN source IP address to remote VTEPs
1 Advertise the IP address of the local source tunnel interface to all VTEPs in the underlay IP network using the existing routing
infrastructure. This example uses OSPF to advertise the VXLAN source IP address on Ethernet1/1/3, which is the underlay network-
facing interface:
OS10(config)# router ospf 100
OS10(config-ospf)# router-id 110.111.170.195
OS10(config-ospf)# exit
OS10(config)# interface ethernet1/1/3
OS10(config-interface)# ip ospf 100 area 0.0.0.0
OS10(config)# interface loopback 1
OS10(config-interface)# ip ospf 100 area 0.0.0.0
Each VTEP switch in the underlay IP network learns the IP address of the VXLAN source interface. If a remote VTEP switch is not
reachable, its status displays as DOWN in show nve remote-vtep output.
2 Congure the MTU value on L3 underlay network-facing interfaces in Interface mode (1280 to 65535) to be at least 50 bytes higher
than the MTU on the server-facing links to allow for VXLAN encapsulation .
mtu value
3 Return to CONFIGURATION mode.
exit
VXLAN
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