VLAN Configuration

Design Guide

VLAN Configuration

To configure the VLANs on the switches, complete the following tasks:

Set the VTP administrative domain name and mode and create the server-farm VLANs as follows:

(config)# vtp domain <domain name> (config)# vtp mode transparent (config)# vlan 60 (config-vlan)# name bladeservers (config-vlan)# state active

RPVST+ Configuration

Configure Spanning Tree Protocol to manage the physical loops in the topology. Cisco recommended using RPVST+ for its fast-convergence characteristics. Set the Spanning Tree Protocol mode on each aggregation switch as follows:

(config)# spanning-tree mode rapid-pvst

Configure the path cost to use 32 bits in the Spanning Tree Protocol calculations:

(config)# spanning-tree pathcost method long

Configure the primary and secondary root switches as follows:

(config)# spanning-tree vlan <vlan range> root primary secondary

Inter-Switch Link Configuration

The topologies discussed in this guide require connectivity between the switches. The following three types of interswitch connections exist:

●Aggregate 1 to aggregate 2

●Aggregate 1 or aggregate 2 to HP c-Class BladeSystem switch A or switch B

●HP BladeSystem switch A to switch B

Each of these connections is a Layer 2 Cisco EtherChannel connection consisting of multiple physical interfaces bound together as a channel group or port channel. These point-to-point links between the switches should carry more than one VLAN; therefore, each is a trunk.

Port-Channel Configuration

Link Aggregate Control Protocol (LACP) is the IEEE standard for creating and managing Cisco EtherChannel connections between switches. Each aggregate switch uses this feature to create a port channel across the line cards. The use of multiple line cards within a single switch reduces the possibility of the point-to-point port channel becoming a single point of failure in the network.

Configure the active LACP members on aggregate 1 to Cisco Catalyst Blade Switch 3020 switch A as follows:

(config)# interface GigabitEthernet12/1

(config-if)# description <<** Connected to Switch-A **>> (config-if)# channel-protocol lacp

(config-if)# channel-group 1 mode active (config)# interface GigabitEthernet11/1

(config-if)# description <<** Connected to Switch-A **>> (config-if)# channel-protocol lacp

© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.

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NAD 3020 manual Port-ChannelConfiguration, VLAN Configuration, RPVST+ Configuration, Inter-SwitchLink Configuration
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3020 specifications

The NAD 3020 is a classic integrated amplifier that has gained a legendary status among audiophiles since its launch in 1978. Known for its incredible sound quality and value for money, the NAD 3020 has become a reference point in the realm of affordable audio equipment.

One of the main features of the NAD 3020 is its high current design, allowing it to drive a wide range of speaker impedances. This capability ensures that the amplifier can deliver a dynamic sound, characterized by a robust bass response and clear treble. With a power output of 20 watts per channel into 8 ohms, the NAD 3020 is often underestimated due to its modest specifications. However, it can produce remarkable sound pressure levels and handle transient peaks with ease.

The amplifier utilizes a simplified circuit design, which is one of its defining characteristics. This minimalist approach reduces potential signal distortion, enabling the amplifier to maintain sonic integrity. The use of discrete components rather than integrated circuits contributes to its rich, detailed audio reproduction, making it a favorite among purists.

Another key technology featured in the NAD 3020 is its unique power supply design. NAD engineers incorporated a toroidal transformer, which is known for its compact size and low electromagnetic interference. This results in cleaner power delivery, which is essential for maintaining audio clarity and depth.

The NAD 3020 is also equipped with multiple inputs, including phono, line-level, and tape inputs, making it versatile for various audio sources. The built-in phono stage supports moving magnet cartridges, allowing vinyl enthusiasts to connect their turntables directly to the amplifier without needing a separate phono preamplifier.

In terms of build quality, the NAD 3020 features a sturdy chassis that minimizes vibrations, ensuring that audio performance remains stable. The user-friendly design includes a straightforward control layout, allowing users to adjust volume and tone settings with ease.

Throughout its decades-long legacy, the NAD 3020 has influenced countless audio products and remains a benchmark for entry-level amplification. Its combination of power, clarity, and affordability makes it a beloved choice for both new listeners and seasoned audiophiles seeking a dependable amplifier that doesn't compromise on sound quality. The NAD 3020 exemplifies how great engineering can lead to remarkable audio experiences, solidifying its place in the history of hi-fi audio.
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