Cisco Nexus 9000 Series Configuration Manual page 127

Configuring VXLAN EVPN Multihoming
EVPN Multihoming Local Traffic Flows
Access Failure for Locally Routed Traffic
In case the ESI link at switch L1 fails, there is no path for the routed traffic to reach from H1 to H2 except
via the overlay. Therefore, the local routed traffic takes the sub-optimal path, similar to the H1 to H3 orphan
flow.
Figure 18: H1, H2, and H3 are in different VLANs. ESI fails on L1. H1->H2 routing happens via VXLAN tunnel encapsulation.
Core Failure for Locally Routed Traffic
If switch L1 gets isolated from the core, it must not continue to attract access traffic, as it will not be able to
encapsulate and send it on the overlay. It means that the access links must be brought down at L1 if L1 loses
core reachability.
Cisco Nexus 9000 Series NX-OS VXLAN Configuration Guide, Release 7.x
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