Dell Active Fabric Manager Betriebsanweisung PDF herunterladen (Seite 31)

• Provides fast convergence if either the link or a device fails

• Optimized forwarding with Virtual Router Redundancy Protocol (VRRP)

• Provides link-level resiliency

• Assures high availability

CAUTION:

Dell Networking recommends not enabling stacking and VLT simultaneously.

If both are enabled at the same time, unexpected behavior occurs.

Multi-domain VLT

An multi-domain VLT (mVLT) configuration allows two different VLT domains connected by a standard Link Aggregation

Control protocol (LACP) LAG to form a loop-free Layer 2 topology in the aggregation layer. This configuration supports a

maximum of 4 units, increasing the number of available ports and allowing for dual redundancy of the VLT. For more

information about mVLT deployments, see Selecting a Layer 2 VLT and Layer 3 with Resiliency (Routed VLT) Fabric

Design.

VLT Terminology

The following are key VLT terms.

• Virtual link trunk (VLT) — The combined port channel between an attached device and the VLT peer switches.

• VLT backup link — The backup link monitors the health of VLT peer switches. The backup link sends configurable,

periodic keep alive messages between VLT peer switches.

• VLT interconnect (VLTi) — The link used to synchronize states between the VLT peer switches. Both ends must be

on 10 Gb or 40 Gb interfaces.

• VLT domain — This domain includes both VLT peer devices, the VLT interconnect, and all of the port channels in the

VLT connected to the attached devices. It is also associated to the configuration mode that must be used to assign

VLT global parameters.

• VLT peer device — One of a pair of devices that are connected with the special port channel known as the VLT

interconnect (VLTi).

VLT peer switches have independent management planes. A VLT interconnect between the VLT chassis maintains

synchronization of Layer 2 and Layer 3 control planes across the two VLT peer switches. The VLT interconnect uses

either 10 Gb or 40 Gb ports on the switch.

A separate backup link maintains heartbeat messages across an out-of-band (OOB) management network. The backup

link ensures that node failure conditions are correctly detected and are not confused with failures of the VLT

interconnect. VLT ensures that local traffic on a chassis does not traverse the VLTi and takes the shortest path to the

destination via directly attached links.

VLT Fabric Terminology

The following terms are unique to the design and deployment of a Layer 2 VLT fabric.

• Core — A switch that connects to aggregation switches. The role of the core is to provide an interconnect to all the

aggregation switches. All the ports on the core switch are used to connect the aggregation, various rack together.

• Access — A switch that connects switch, servers, storage devices, or top-of-rack (TOR) elements. The role of the

access switch is to provide connectivity to the fabric. The access switch connects to all of aggregation switches

above it in the fabric.

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Dell Active Fabric Manager Betriebsanweisung Seite 31