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Table of Contents

Catalyst Switch GigaStack Configuration and Implications..........................................................................1

Document ID: 22360................................................................................................................................1

Introduction..........................................................................................................................................................1

Prerequisites.........................................................................................................................................................1

Requirements..........................................................................................................................................1

Components Used...................................................................................................................................3

Conventions............................................................................................................................................3

Cabling Configuration.........................................................................................................................................3

Point−to−Point Connection.....................................................................................................................4

Cascaded Stack Connections..................................................................................................................4

Cascaded Stack Connections with a Redundant Link.............................................................................5

Using the Cross−Tack Uplink Fast Feature............................................................................................5

Troubleshooting...................................................................................................................................................8

NetPro Discussion Forums − Featured Conversations......................................................................................10

Related Information...........................................................................................................................................10

Cisco − Catalyst Switch GigaStack Configuration and Implications

Summary of content (11 pages)

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Cisco − Catalyst Switch GigaStack Configuration and Implications Table of Contents Catalyst Switch GigaStack Configuration and Implications..........................................................................1 Document ID: 22360................................................................................................................................1 Introduction........................................................................................................................................
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Catalyst Switch GigaStack Configuration and Implications Document ID: 22360 Introduction Prerequisites Requirements Components Used Conventions Cabling Configuration Point−to−Point Connection Cascaded Stack Connections Cascaded Stack Connections with a Redundant Link Using the Cross−Tack Uplink Fast Feature Troubleshooting NetPro Discussion Forums − Featured Conversations Related Information Introduction The GigaStack Gigabit Interface Converter (GBIC) is a Cisco proprietary GBIC.
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Catalyst 2912MF XL Catalyst 2924M XL Catalyst 2924M XL DC Catalyst WS−X2931−XL Catalyst 3508G XL Catalyst 3512 XL Catalyst 3524 XL Catalyst 3524 PWR XL Catalyst 3548 XL Catalyst 2950G−12−EI Catalyst 2950G−24−EI Catalyst 2950G−24−EI−DC Catalyst 2950G−48−EI Catalyst 3550−12G Catalyst 3550−12T Catalyst 3550−24−SMI Catalyst 3550−24−EMI Catalyst 3550−24−SMI−DC Catalyst 3550−48−SMI Catalyst 3550−48−EMI 11.2(8)SA6 12.0(5)XU 12.0(5)WC3b 12.0(5)XU 12.0(5)XU 12.0(5)WC3b 11.2(8)SA6 12.0(5)XU 12.0(5)WC3b 11.
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Components Used The GigaStack GBIC is an adapter that can only be installed into the GBIC modules slot of any supported switch. The maximum distance for a GBIC−to−GBIC connection is one meter. The GigaStack GBIC requires Cisco proprietary signaling and cabling. Each GigaStack GBIC consists of two ports, port 1 and port 2. One or both ports can be used, depending on cabling configuration.
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Point−to−Point Connection Point−to−point connections consist of one GigaStack GBIC per switch and only one connection exists between these modules. The additional available port on the Gigastack is not used and should not be connected to any other device. In this configuration, the GigaStack interface will automatically negotiate to full−duplex. One switch can have multiple point−to−point connections with neighbors as long as you are only using one per port on separate GigaStacks to neighboring switches.
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Caution: GBICs are sensitive to power spikes. It is advised to regulate the power to the devices to avoid GBIC failures. Cascaded Stack Connections with a Redundant Link Cascaded stack configuration with a redundant link consists of one GigaStack GBIC per switch. Multiple connections exist between these modules. By using one module per switch, you are able to interconnect between three and nine switches using only one GigaStack module per switch.
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in a shared cascaded configuration (multidrop backbone). During the fast transition, an alternate redundant link on the stack of switches is placed in the forwarding state without causing temporary spanning−tree loops or loss of connectivity to the backbone. With this feature, you can have a redundant and resilient network in some configurations.
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Events that Cause Fast Convergence section of this document), the Fast Uplink Transition Protocol uses the neighbor list to send fast−transition requests on the stack port to stack members. The switch sending the fast−transition request needs to do a fast transition to the forwarding state of a port that it has chosen as the root port, and it must obtain an acknowledgement from each stack switch before performing the fast transition.
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• CSUF uses the GigaStack GBIC and runs on all Catalyst 3550 switches, all Catalyst 3500 XL switches, Catalyst 2950 switches with GBIC module slots, and only on modular Catalyst 2900 XL switches that have the 1000BASE−X module installed. • Up to nine stack switches can be connected through their stack ports to the multidrop backbone. Only one stack port per switch is supported. • Each stack switch can be connected to the spanning−tree backbone through one uplink.
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When two switches are connected by a GigaStack GBIC and duplex is forced to full on both ends, the link may flap and never stabilize. When reconfigured to auto duplex on both ends, the link still will not stabilize. After reinserting one of the razors, the link finally stabilizes. This is also seen when link negotiation is shut off. Duplex must always be auto−negotiated when a GigaStack GBIC is inserted. Configure the GigaStack ports to auto−negotiate duplex by issuing the interface command duplex auto.
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NetPro Discussion Forums − Featured Conversations Networking Professionals Connection is a forum for networking professionals to share questions, suggestions, and information about networking solutions, products, and technologies. The featured links are some of the most recent conversations available in this technology.