Considerations For Vxlan Deployment - Cisco Nexus 7000 Series Configuration Manual

Configuring VXLAN Flood and Learn
• SPAN is not supported for NVE tunnel interfaces.
• Equal cost multipath (ECMP) on the core is based on inner packet (DMAC, SMAC) combination.
• Maximum 64 MST instances are supported.
• MST scale limit is 300K logical ports on unidimensional setup.
• When vPC peer-link flap, Mac addresses will be flushed for orphan and vPC ports. End point needs to
re-ARP.
• 32 VSI encapsulation profiles are supported per interface.
• SSM is not supported
• Bi-Dir multicast mode is not supported for vPC
• IGMP Snooping Layer2 Multicast Mac lookup mode is not supported.
• IPv6 for Multicast is not supported.
• Hypervisor VLANs can be configured using regular VLAN and trunk or access port configurations.
• vPC peer-link can carry both global VLANs and bridge-domains that are VXLAN enabled.

Considerations for VXLAN Deployment

• A loopback address is required when using the source-interface config command. The loopback address
represents the local VTEP IP.
• For the Network Virtualization Endpoint (NVE) source loop back address, secondary address should
be same on both the vPC peers and the primary address should be different.
• To establish IP multicast routing in the core, IP multicast configuration, PIM configuration, and RP
configuration is required.
• VTEP to VTEP unicast reachability can be configured through any IGP protocol.
vPC Considerations for VXLAN Deployment
• Bind NVE to a loopback address that is separate from other loopback addresses that are required by
Layer 3 protocols. A best practice is to use a dedicated loopback address for VXLAN.
• The loopback address used by NVE needs to be configured to have a primary IP address and a secondary
IP address.
• The secondary IP address is used for all VXLAN traffic that includes multicast and unicast encapsulated
traffic.
• VPC peers must have identical configurations as listed below:
◦ Unicast and Multicast packets and bytes received
◦ Consistent Bridge-domain to VNI mapping.
◦ Consistent NVE binding to the same loopback interface.
◦ Using the same secondary IP address.
Guidelines and Limitations for VXLAN
Cisco Nexus 7000 Series NX-OS VXLAN Configuration Guide
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