Deployment Guide

● N3248TE-ON
Topics:
• VXLAN concepts
• VXLAN as NVO solution
• Configure VXLAN
• L3 VXLAN route scaling
• Overlay ECMP for L3 prefix routes
• DHCP relay on VTEPs
• View VXLAN configuration
• VXLAN MAC addresses
• VXLAN commands
• VXLAN MAC commands
• Example: VXLAN with static VTEP
VXLAN concepts
Network
virtualization
overlay (NVO)
An overlay network extends L2 connectivity between server virtual machines (VMs) in a tenant segment
over an underlay L3 IP network. A tenant segment can be a group of hosts or servers that are spread
across an underlay network.
● The NVO overlay network uses a separate L2 bridge domain (virtual network), which is independent of
legacy VLAN forwarding.
● The NVO underlay network operates in the default VRF using the existing L3 infrastructure and
routing protocols.
Virtual extensible
LAN (VXLAN)
A type of network virtualization overlay that encapsulates a tenant payload into IP UDP packets for
transport across the IP underlay network.
VXLAN network
identifier (VNI)
A 24-bit ID number that identifies a tenant segment and transmits in a VXLAN-encapsulated packet.
VXLAN tunnel
endpoint (VTEP)
A switch with connected end hosts that are assigned to virtual networks. The virtual networks map to
VXLAN segments. Local and remote VTEPs perform encapsulation and de-capsulation of VXLAN headers
for the traffic between end hosts. A VTEP is also known as a network virtualization edge (NVE) node.
Bridge domain A L2 domain that receives packets from member interfaces and forwards or floods them to other member
interfaces based on the destination MAC address of the packet. OS10 supports two types of bridge
domains: simple VLAN and virtual network.
● Simple VLAN: A bridge domain a VLAN ID represents. Traffic on all member ports is assigned with the
same VLAN ID.
● Virtual network: A bridge domain a virtual network ID (VNID) represents. A virtual network supports
overlay encapsulation and maps with either a single VLAN ID in a switch-scoped VLAN or with multiple
(Port,VLAN) pairs in a port-scoped VLAN.
Distributed
routing
All VTEPs in a virtual network perform intersubnet routing and serve as L3 gateways in two possible
modes:
● Asymmetric routing: All VTEPs can perform routing. Routing decisions are made only on ingress
VTEPs. Egress VTEPs perform bridging.
● Symmetric routing: All VTEPs perform routing. Routing decisions are made on both ingress and egress
VTEPs.
Virtual network In OS10, each L2 flooding domain in the overlay network is represented as a virtual network.
Virtual network
identifier (VNID)
A 16-bit ID number that identifies a virtual network in OS10.
Virtual-network
interface
A router interface that connects a virtual network bridge to a tenant VRF routing instance.
Access port A port on a VTEP switch that connects to an end host and is part of the overlay network.
Network port A port on a VTEP switch that connects to the underlay network.
VXLAN 7