Dynamic Virtual Networks

ExtremeXOS 30.3 introduces the ability to globally enable dynamic virtual network creation by using the following command:

configure virtual-network dynamic [on | off]

Dynamic virtual network is disabled by default. Creating or deleting BGP Auto-peering enables/disables automatic virtual network creation.

The status of this command is visible in the following command:

show virtual-network {vn_name | vxlan vni vni | [vlan vlan_name | vman vman_name]}

When this feature is enabled, the following occurs for a new VLAN-NSI mapping:

A dynamic virtual network is created. The virtual network name is generated with a system reserved prefix.
VXLAN VNI is configured for the virtual network. The VNID is same as the value of NSI.
The VLAN is configured as a tenant VLAN.

When a VLAN-NSI mapping is deleted, the dynamically created virtual network along with the VNI and VLAN associations are purged.

Dynamic Virtual Networks Properties

All restrictions for static virtual network, both configuration and functional, also apply to dynamic virtual networks.
A dynamic virtual network is not saved to the configuration and is not persistent across reboots.
IGMP snooping is internally disabled for a VLAN dynamically configured as tenant VLAN of a virtual network.
When a dynamic virtual network is renamed, it becomes static and can be saved to the configuration.
You can delete a dynamic virtual network from the CLI. It is recreated if dynamic virtual network feature is on, and the conditions are met.
The default reserved prefix pattern for a dynamic virtual network name is SYS_VNET_xxxxxxxx, where xxxxxxxx is VNID (in the lines of dynamic VLANs – SYS_VLAN_xxxx).
If SYS_VNET_ prefix is already in use by virtual networks in an older configuration, best effort is made to choose one of the following non-conflicting prefixes – SYS_VNET_DYN_, SYS_VNET_AUTO_, SYS_VNET_AUTOGEN_.