NAD manual Cisco Catalyst Blade Switch 3020 Features, Spanning Tree

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Cisco Catalyst Blade Switch 3020 Features

Design Guide

Cisco Catalyst Blade Switch 3020 Features

This section highlights information about the protocols and features provided by the Cisco Catalyst Blade Switch 3020 that help integrate the HP c-Class BladeSystem enclosure into the Cisco Data Center Network Architecture.

Spanning Tree

The Cisco Catalyst Blade Switch 3020 supports different versions of the Spanning Tree Protocol and associated features, including the following:

●Rapid Spanning Tree Protocol (RSTP), based on IEEE 802.1w

●Multiple Spanning Tree (MST), based on IEEE 802.1s (and includes IEEE 802.1w support)

●PVST+

●Rapid PVST+ (RPVST+)

●Loop Guard

●UDLD

●BPDU Guard

●PortFast

●UplinkFast (Cisco proprietary enhancement for IEEE 802.1d deployments)

●BackboneFast (Cisco proprietary enhancement for IEEE 802.1d deployments)

The IEEE 802.1w protocol is the standard for rapid spanning tree convergence, whereas IEEE 802.1s is the standard for multiple spanning-tree instances. Support for these protocols is essential in a server-farm environment for allowing rapid Layer 2 convergence after a failure occurs in the primary path. The primary benefits of IEEE 802.1w include the following:

●The spanning-tree topology converges quickly after a switch or link failure.

●Convergence is accelerated by a handshake, known as the proposal agreement mechanism.

Note: The user need not enable PortFast, BackboneFast, or UplinkFast if running RSTP.

In terms of convergence, Spanning Tree Protocol algorithms based on IEEE 802.1w are much faster than the traditional Spanning Tree Protocol IEEE 802.1d algorithms. The proposal agreement mechanism allows the Cisco Catalyst Blade Switch 3020 to decide new port roles by exchanging proposals with its neighbors.

With IEEE 802.1w, as with other versions of the Spanning Tree Protocol, BPDUs are sent by default every 2 seconds (called the hello time). If three BPDUs are missed, Spanning Tree Protocol recalculates the topology, a process that takes less than 1 second for IEEE 802.1w.

Because the data center is made of point-to-point links, the only failures are physical failures of the networking devices or links. The IEEE 802.1w protocol can actively confirm that a port can safely transition to forwarding without relying on any timer configuration, meaning that the actual convergence time is less than 1 second.

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

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Contents BladeSystem into the Cisco Data Switch 3020 for the HP c-ClassIntegrating the Cisco Catalyst Blade Center Network ArchitectureContents Introduction HP c-ClassBladeSystem Enclosure OverviewDesign Guide Design Guide Cisco Catalyst Blade Switch 3020 for HP Page 5 ofCisco Catalyst Blade Switch 3020 Features Spanning TreeDesign Guide Traffic Monitoring Link Aggregation Protocols Design Guide Figure 5. RSPAN ExampleData Center Network Architecture Data Center Network ComponentsAccess Layer Aggregation LayerHigh Availability High AvailabilityDesign Goals Design GuideHigh Availability for the Blade Servers Scalability Physical Port CountSlot Count Design GuideManagement Out-of-BandManagementIn-BandManagement Serial Console PortDesign Guide Design and Implementation Details Network Management RecommendationsRecommended Topology Primary root switch failure and recovery Configuring the Aggregate Switches Configuring the Cisco Catalyst Blade Switch 3020sAdditional Aggregation-SwitchConfiguration Alternative Topology Configuration Details Configuring the Aggregate SwitchesConfiguring the Cisco Catalyst Blade Switch 3020s RPVST+ Configuration Port-ChannelConfigurationVLAN Configuration Inter-SwitchLink ConfigurationTrunking Configuration Server-PortConfiguration Server Default Gateway Configuration RSPAN Configuration Page 28 of
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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.

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