Cisco Nexus 7000 Series Configuration Manual page 55

Configuring VXLAN BGP EVPN
End Host and Subnet Route Distribution
Distributed IP anycast gateway
The gateway is referred as a distributed IP anycast gateway, since the gateway is distributed across all relevant
VTEPs.
The gateway provides routing and bridging capabilities, and the mechanism is referred as Integrated Routing
and Bridging (IRB).
The distributed anycast gateway for routing is completely stateless and does not require the exchange of
protocol signalization for election or failover decision.
All VTEPs host active default gateways for their respective configured subnets and First Hop Routing Protocols
(FHRP) such as HSRP, VRRP etc. are not needed.
A sample distributed gateway for a setup is given below:
Figure 9: Distributed Gateway
Blue tenant network's configuration
Similar configuration needs to be implemented on the leaf switch V1 and all other switches containing the
blue tenant network's end hosts. Configuration details are provided in BGP EVPN and Overlay Configuration
chapter. Similar configuration needs to be implemented for red tenant too.
After the configurations, end host traffic within a VNI (say 30000) is bridged, and traffic between tenant
networks is routed. The routing takes place through a Layer-3 VNI (say 50000) typically having a one-on-one
association with a VRF instance.
Cisco Nexus 7000 Series NX-OS VXLAN Configuration Guide
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