White Papers

86 Using MLAG in Dell Networking N-Series Switches | version 1.5
Voice VLAN: Voice VLAN is a feature that enables switch ports to carry voice traffic with an administrator-
defined priority so as to enable prioritization of voice traffic over data traffic.
VoIP: Voice over Internet Protocol is a set of methodologies for the delivery of voice communications over
Internet Protocol.
VLT: Virtual Link Trunking is a protocol that enables active/active aggregation of Dell Networking OS based
switches providing connections to two switches but appearing as one logical switch to participating members.
VLT Domain: A VLT domain contains both VLT peer switches, the VLT peer keepalive link and all of the port
channels in the VLT connected to the downstream devices.
VLTi (VLT interconnect): A port channel used to synchronize data between the VLT peer devices. This link
carries control traffic between two VLT switches as well as multicast and broadcast data.
VLT Member Ports: Interfaces that belong to the switches with VLT aggregation configured.
VLT Members: Upstream and downstream switches connected using a special port channel known as a VLTi
Peer-Link.
VLT Mode: An operational mode for an IOM that automatically configures VLT using external facing port 9 as
the VLTi, leaving the three remaining ports available for upstream connectivity.
VLT Peer Keepalive Link: A VLT peer keepalive link monitors the vitality of a VLT peer switch by sending
periodic keepalive messages between VLT peer devices. No data or synchronization traffic is sent over this
link, only keepalive messages.
VLT Peer-Link: See VLTi.
vPC: A virtual PortChannel allows links that are physically connected to two different Cisco switches to
appear to be coming from a single device as part of a single port channel to a third downstream device.
vPC Peer Switches: Two switches connected using a special port channel known as a vPC Peer-Link.
vPC Peer Link: This port channel is used to synchronize data between the vPC peer devices. The link carries
control traffic between two vPC switches as well as multicast and broadcast data.
vPC Domain: A vPC domain contains both vPC peer switches, the vPC peer keepalive link and all of the port
channels in the vPC connected to the downstream devices. A domain can be assigned with a value from 1 to
1000.
vPC Member Ports: vPC member ports are interfaces that belong to the vPCs.
VRRP: VRRP stands for Virtual Router Redundancy Protocol. It provides a means of gateway redundancy
through the concept of a virtual router. Two or more routers maintain communication between one another via
keepalives in order to decide which physical router assumes the role of the gateway, or the virtual router.