Glossary

V
Virtual extensible
LAN (VXLAN)
A type of network virtualization overlay that encapsulates a tenant payload into IP UDP packets for
transport across the IP underlay network.
Virtual fabric
(vfabric)
A fabric that divides a physical fabric into logical fabrics.
Virtual LANs
(VLANs)
A group of devices on one or more LANs that are configured to communicate as if they were attached to
the same wire, when in fact they are located on a number of different LAN segments.
Virtual Link
Trunking (VLT)
A L2 aggregation protocol used between an end device such as a server and two or more connected
network devices. VLT helps to aggregate ports terminating on multiple switches.
Virtual network An overlay network in the L2 flooding domain.
Virtual network
identifier (VNID)
A 16-bit ID number that identifies a virtual network in OS10.
Virtual Router
Redundancy
Protocol (VRRP)
A protocol that eliminates a single point of failure in a statically routed network.
Virtual Routing
and Forwarding
(VRF)
A mechanism to partition a physical router into multiple virtual routers.
Virtual Teletype
(VTY)
A command line interface (CLI) created on a switch to facilitate a connection through Telnet.
Virtual-network
interface
A router interface that connects a virtual network bridge to a tenant VRF routing instance.
VLT domain A domain that includes VLT peer devices, VLT interconnects, and all port channels in the VLT connected
to the attached devices. You must use this configuration mode to assign VLT global parameters.
VLT interconnect
(VLTi)
The link between VLT peer switches that synchronizes operating states.
VLT MAC address A unique MAC address that you assign to the VLT domain. A VLT MAC address is a common address in
both VLT peers. If you do not configure a VLT MAC address, the MAC address of the primary peer is used
as the VLT MAC address across both peers.
VLT peer device A pair of devices connected using a dedicated port channel—the VLTi. You must configure VLT peers
separately.
VLT port channel A link aggregation technology that combines two or more physical interfaces into a single logical interface.
VRRP
authentication
A process that allows trusted routers to participate in VRRP processes.
VXLAN Network
Identifier (VNI)
A 24-bit ID number that defines the broadcast domain.
VXLAN Tunnel
Endpoint (VTEP)
A switch with connected end hosts that are assigned to virtual networks. The virtual networks map to
VXLAN segments. Local and remote VTEPs perform encapsulation and de-capsulation of VXLAN headers
for the traffic between end hosts. A VTEP is also known as a network virtualization edge.
W
Weighted
Random Early
Detection
(WRED)
A queuing discipline for a network scheduler suited for congestion avoidance. It is an extension to RED,
where a single queue may have several different sets of queue thresholds.
14 Glossary of Terms