26.1.13 Notes on using VXLAN

(1) Coexistence with other functions

See "22.3 Coexistence of Layer 2 switch function and other functions".

(2) Transmitting VXLAN Frames

To transmit VXLAN frames on VXLAN Network, next-hop addressing must be completed. If the next-hop address resolution is not completed when a VXLAN frame is sent, the corresponding VXLAN frame is discarded. Also, the next-hop address is not resolved dynamically.

Therefore, configure a static ARP or use the dynamic monitoring facility for static routes so that the next-hop address is resolved dynamically.

(3) IP addressing of the remote VTEP

IP address of the remote VTEP (the destination address set on the Switch) must be a host address.

(4) Filters when a VLAN is specified for a subinterface

If a filter is set for the same VLAN interface as VLAN ID specified in encapsulation dot1q configuration command for the subinterface, frames received on the subinterface are detected by the filter of the corresponding VLAN interface.

(5) About Stack Configurations

If the master switch is restarted or stopped with more than a few hundred VNI mapped in a stacked configuration, it may take several minutes for the resulting information to be displayed if an operation command is executed on the new master switch immediately after the master switch is changed.

(6) About TPID Settings

Communication on the target VXLAN Access port is disabled if TPID is set for VXLAN Access port and device in the configuration.

(7) About VXLAN Access when mapping VLAN

If you set extended parameter in the configuration command vxlan vlan-mapping mode and use VLAN mapping for VNI mapping method, do not specify VLAN for which the configuration command vxlan-vni is set in native vlan parameter of the native VLAN(switchport trunk command for VXLAN Access port).

(8) About Frames with Stacked IEEE802.1Q VLAN Tag

VXLAN tunneling feature is not supported.

(9) When VXLAN PMTU function is disabled

It may take several minutes to disable VXLAN PMTU function. If you disable VXLAN PMTU feature by deleting the configuration command vxlan pmtu or vxlan enable, do not configure the Filter QoS Policy-Based Mirroring feature at the same time. If you disable VXLAN PMTU feature, wait a few minutes before configuring the filter QoS policy-based mirroring feature.

(10) About VXLAN PMTU Functions in Networking with IPv6

When using VXLAN PMTU function in a network that encapsulates IPv6 packets, set the configuration command vxlan pmtu to a value of 1280 octets or more.

(11) VXLAN PMTU function on VLAN not subject to VNI mapping

If VNI is not mapped on VLAN, and VXLAN PMTU function is enabled, VXLAN PMTU function also works for VLAN that does not have VNI mapping. However, when the receive-side flow-detection mode is IP not set VLAN suppression mode, the operation is as follows in a VLAN that does not have VNI mapping.

When the configuration command ip address is not set

IPv4 packets that exceed PMTU are discarded, but are not advertised by ICMP packets.

When the configuration command ipv6 enable is not set

IPv6 packets that exceed PMTU are discarded, but are not advertised by ICMPv6 packets.