Figure 83: All-Active Multihoming VXLAN L2 Gateway
BUM traffic from DC1 arrives at Nexus 9000 leaf first. Nexus 9000 replicates the traffic to two ASR 9000
DCI nodes. DF DCI nodes flood traffic to WAN. Non-DF node drops traffic from DC fabric. Traffic flooded
to WAN goes to DC2 and DC3. One copy comes back to DC1 through bottom DCI node. The bottom DCI
node compares the split horizon label in the received MPLS packet and drops the packet.
In the reverse direction, when the traffic flows from DC2 and DC3, towards DC1, arrives at both top and
bottom DCI nodes. The bottom DCI which is a non-DF drops traffic. The top DCI which is a DF, forwards
four copies to remote leaf nodes. The Nexus 9000 leaf nodes forward traffic to an IP host.
Configure EVPN VXLAN Ingress Replication
Perform the following tasks to configure EVPN VXLAN Ingress Replication feature:
• Configure DCI
• Configure ToR
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
561
EVPN Features
Configure EVPN VXLAN Ingress Replication
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