Configuring Vxlan Flood And Learn - Cisco Nexus 7000 Series Configuration Manual

Configuring VXLAN Flood and Learn

This chapter contains the following sections:
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Information About VXLAN
VXLAN with vPC Overview
The vSwitch can be dually connected to the vPC via a hypervisor VLAN. The VTEP on L1 and L2 is identified
by the same IP address. vPC is active/active for East-West traffic (from the physical server to the VMs behind
vSwitch). It is active/standby with the elected forwarder for packets from North-South traffic.
Active/Active scheme:
• Both switches perform encapsulation and decapsulation between the VXLAN tunnel (on the access side)
• If a packet comes in on hypervisor VLAN on a switch it is bridged to other peers via the peerlink. The
• If a packet comes into the tenant VNI from the physical server, it is bridged to the vPC peer. The VXLAN
Active/Standby scheme:
• Since hardware does not have a mechanism to prevent both switches from sending and receiving packets
Information About VXLAN, page 13
Configuring VXLAN, page 23
Verifying the VXLAN Configuration, page 29
Configuration Examples, page 30
Feature History for VXLAN Flood and Learn, page 37
and the physical servers. To prevent duplicate copies, we rely on the VSL bit.
decapsulated copy is prevented from going over the peer link (using reserved ftag CBL scheme). Both
switches bridge locally on the hypervisor VLAN and decapsulate and bridge in the tenant VNI (the VSL
bit prevents a duplicate copy from being sent to the vPC legs).
tunnel encapsulated copy is blocked from going over the peerlink using LTL+1 logic.
to and from the North, one of the vPC peers is selected as the forwarder by PIM.
C H A P T E R
Cisco Nexus 7000 Series NX-OS VXLAN Configuration Guide
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