NAD 3020 manual Link Aggregation Protocols, Design Guide . RSPAN Example

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Design Guide

Design Guide

Figure 5. RSPAN Example

Link Aggregation Protocols

Cisco Fast EtherChannel interfaces and Gigabit EtherChannel interfaces are logically bundled, and they provide link redundancy and scalable bandwidth between network devices. PAgP and LACP help automatically create these channels by exchanging packets between Ethernet interfaces and negotiating a logical connection. PAgP is a Cisco proprietary protocol that can be run only on Cisco switches or on switches manufactured by vendors that are licensed to support PAgP. LACP is a standard protocol that allows Cisco switches to manage Ethernet channels between any switches that conform to the IEEE 802.3ad protocol. Because the Cisco Catalyst Blade Switch 3020 supports both protocols, you can use either IEEE 802.3ad or PAgP to form port channels between Cisco switches.

For both of these protocols, a switch learns the identity of partners capable of supporting either PAgP or LACP and identifies the capabilities of each interface. The switch dynamically groups similarly configured interfaces into a single, logical link, called a channel or aggregate port. The interface grouping is based on hardware, administrative, and port parameter attributes. For example, PAgP groups interface with the same speed, duplex mode, native VLAN, VLAN range, trunking status, and trunking type. After grouping the links into a port channel, PAgP adds the group to the spanning tree as a single switch port.

In Figure 6, each blade switch uses an alternative configuration. The switch is no longer dual homed; instead all the ports are put into a single Cisco EtherChannel uplink to the aggregation switch above. This single EtherChannel uplink can use up to the full 8 ports, providing a 2-to-1 cable reduction from the servers. In this configuration, the Spanning Tree Protocol may not be needed because there is no loop in the network if the interconnect ports between the two blade switches are disabled.

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

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Contents Integrating the Cisco Catalyst Blade Switch 3020 for the HP c-ClassBladeSystem into the Cisco Data Center Network ArchitectureContents Introduction HP c-ClassBladeSystem Enclosure OverviewDesign Guide Design Guide Page 5 of Cisco Catalyst Blade Switch 3020 for HPSpanning Tree Cisco Catalyst Blade Switch 3020 FeaturesDesign Guide Traffic Monitoring Design Guide Figure 5. RSPAN Example Link Aggregation ProtocolsData Center Network Components Data Center Network ArchitectureAggregation Layer Access LayerDesign Goals High AvailabilityHigh Availability Design GuideHigh Availability for the Blade Servers Physical Port Count ScalabilityDesign Guide Slot CountOut-of-BandManagement ManagementIn-BandManagement Serial Console PortDesign Guide Network Management Recommendations Design and Implementation DetailsRecommended 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 VLAN Configuration Port-ChannelConfigurationRPVST+ Configuration Inter-SwitchLink ConfigurationTrunking Configuration Server-PortConfiguration Server Default Gateway Configuration Page 28 of RSPAN Configuration
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3020 specifications

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