Cisco Nexus 1000V User Manual

CHAPTER
25-1
Cisco Nexus 1000V Troubleshooting Guide, Release 5.2(1)SV3(1.1)
OL-31593-01
25
VXLANs
This chapter describes how to identify and resolve problems that might occur when implementing Virtual
Extensible Local Area Networks (VXLANs) and includes the following sections:
• Information About VXLANs, page 25-1
• VXLAN Troubleshooting Commands, page 25-9
• VEM Packet Path Debugging, page 25-16
• VEM Multicast Debugging, page 25-17
• VXLAN Data Path Debugging, page 25-18
Information About VXLANs
This section includes the following topics:
• Overview, page 25-1
• VXLAN Tunnel EndPoint, page 25-2
• VXLAN Gateway, page 25-2
• VXLAN Trunks, page 25-3
• VXLAN Border Gateway Protocol Control Plane, page 25-3
• Multi-MAC Capability, page 25-8
• Fragmentation, page 25-8
• Scalability, page 25-8
• Supported Features, page 25-9
Overview
A Virtual Extensible LAN creates LAN segments by using an overlay approach with MAC-in-UDP
encapsulation and a 24-bit segment identifier in the form of a VXLAN ID. The encapsulation carries the
original Layer 2 frame from the virtual machine (VM) that is encapsulated from within the Virtual
Ethernet Module (VEM). Each VEM is assigned an IP address that is used as the source IP address when
encapsulated MAC frames are sent over the network. You can have multiple VTEPs per VEM that are
used as sources for this encapsulated traffic. The encapsulation carries the VXLAN identifier used to

Cisco Nexus 1000V Specifications

General

Type	Virtual Switch
Manageable	Yes
NetFlow	Yes
SPAN	Yes
ERSPAN	Yes
Operating System	Cisco NX-OS
Form Factor	Virtual
Hypervisor Support	VMware ESXi
Features	VXLAN
Security Features	Port Security, Private VLANs, ACLs