Connectivity Guide

Table Of Contents
The following tables show how to use anycast gateway IP and MAC addresses in a data center with three virtual networks and
multiple VTEPs:
Globally configure an anycast MAC address for all VTEPs in all virtual networks. For example, if you use three VTEP switches
in three virtual networks:
Table 20. MAC address for all VTEPs
Virtual network VTEP Anycast gateway MAC address
VNID 11 VTEP 1
VTEP 2
VTEP 3
00.11.22.33.44.55
00.11.22.33.44.55
00.11.22.33.44.55
VNID 12 VTEP 1
VTEP 2
VTEP 3
00.11.22.33.44.55
00.11.22.33.44.55
00.11.22.33.44.55
VNID 13 VTEP 1
VTEP 2
VTEP 3
00.11.22.33.44.55
00.11.22.33.44.55
00.11.22.33.44.55
Configure a unique IP address on the virtual-network interface on each VTEP across all virtual networks. Configure the same
anycast gateway IP address on all VTEPs in a virtual-network subnet. For example:
Table 21. IP address on the virtual-network interface on each VTEP
Virtual network VTEP Virtual-network IP
address
Anycast gateway IP address
VNID 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
VNID 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
VNID 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
Advertise VXLAN source IP address
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-if-eth1/1/3)# ip ospf 100 area 0.0.0.0
OS10(config-if-eth1/1/3)# exit
OS10(config)# interface loopback 1
OS10(config-if-lo-1)# 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 the show nve remote-vtep output.
656
VXLAN