Bud Node Topology - Cisco Nexus 9000 Series Configuration Manual
Nx-os vxlan
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Also See for Nexus 9000 Series:
- Configuration manual (562 pages) ,
- Troubleshooting manual (126 pages) ,
- Quick start configuration manual (6 pages)
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Overview
Bud Node Topology
A bud node is a device that is a VXLAN VTEP device and at the same time it is an IP transit device for the
same multicast group used for VXLAN VNIs. In the figure, multicast group 239.0.0.1 is used for VXLAN
VNIs. For VXLAN multicast encapsulated traffic from Host-1 to Host-2, VTEP-1 performs a multicast
reverse-path forwarding (RPF) check in group 239.0.0.1 and then VXLAN decapsulation. For VXLAN
multicast encapsulated traffic from Host-1 to Host-3 using the same group 239.0.0.1, VTEP-1 is an IP transit
device for the multicast packets. It performs an RPF check and IP forwarding based on the outer IP header
that has 239.0.0.1 as the destination. When these two different roles collide on the same device, the device
becomes a bud node.
The Cisco Nexus 9000 Series switches provide support for the bud node topology. The application leaf engine
(ALE) of the device enables it to be a VXLAN VTEP device and an IP transit device at the same time so the
device can become a bud node.
Figure 1: VXLAN Bud-Node Topology
The bud node topology is not supported when SVI uplinks exist in the configuration.
Note
For bud-node topologies, the source IP of the VTEP behind VPC must be in the same subnet as the
Note
infra-VLAN.
VXLAN BGP EVPN Control Plane
A Cisco Nexus Series Switch can be configured to provide a BGP ethernet VPN (EVPN) control plane using
a distributed anycast gateway, with Layer 2 and Layer 3 VxLAN overlay networks.
Cisco Nexus 9000 Series NX-OS VXLAN Configuration Guide, Release 7.x
Bud Node Topology
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- Configuring Vxlan
- Configuring Q-In-Vni
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