1 DATA SHEET Technical Information GigaStack GBIC THE CISCO SYSTEMS GIGASTACK GIGABIT INTERFACE CONVERTER (GBIC) IS A VERSATILE, LOW-COST, GIGABIT ETHERNET STACKING GBIC THAT OFFERS HIGH-SPEED INTERCONNECTIVITY BETWEEN CATALYST 3500 SERIES XL AND MODULAR CATALYST 2900 SERIES XL SWITCHES. The GigaStack GBIC is implemented in a standard GBIC form, which offers customers the highest level of deployment flexibility and scalability using available Gigabit Ethernet GBIC ports for high-performance stacking today while preserving the option to migrate to standard Gigabit Ethernet uplinks tomorrow. Figure 1 The two-port GigaStack GBIC delivers high-speed interconnectivity between series XL and modular Catalyst 2900 series XL switches The GigaStack GBIC offers wiring closet deployment flexibility through its dual operating modes. It delivers a 1-Gbps forwarding rate in a half-duplex cascade configuration or up to 2-Gbps full-duplex connectivity in a dedicated, switch-to-switch configuration. The two-port GigaStack GBIC allows customers to deploy the GigaStack GBIC with various performance and cabling options. Customers can initially deploy the low-cost GigaStack GBIC to create a 1-Gbps independent stack backplane in a cascade configuration. At any point, customers may increase stack performance to 5 Gbps using the same GigaStack GBICs in combination with the high-performance Catalyst 3508G XL Gigabit Ethernet aggregation switch; each link in this configuration will forward up to 2 Gbps. Half-Duplex Configuration Options Using both ports of each GigaStack GBIC, users can implement a half-duplex cascade of up to nine switches. In this configuration, the GigaStack GBIC will create a half-duplex repeater bus external to the switch fabric of connected switches. This means that traffic bound from one switch to another will not traverse the switch fabric of intermediate switches. Support for nine switches in a single GigaStack stack offers significant wiring-closet port growth opportunities up to a maximum of /100 ports per stack. Customers can choose to implement various stackwide physical redundancy options to provide the highest levels of resiliency. For example, users can choose to deploy a 1 meter redundant loopback cable and a second GigaStack GBIC in the top and bottom stack members. This will create a secondary failover connection in the rare case that a stack member or stack cable fails. Alternatively, users can choose to deploy a 1 meter redundant loopback cable attached to the unused GigaStack ports in the top and bottom stack members (this option is available with the March 00 software release). New switch cluster command management redundancy features (also available in the March 00 software release), enable series XL switches to achieve the highest levels of system resiliency. Figure 2 illustrates a switch stack combined with the GigaStack GBIC half-duplex cascade feature. This configuration utilizes all XL switches and is suitable for those who recognize the need for Gigabit Ethernet uplinks today. In this scenario, connection redundancy is ensured via the redundant loopback cable attached to the top and bottom switches in the stack.
2 Figure 2 Half-Duplex GigaStack Cascade Configuration with XL Switches. Daisy Chain at 1-Gbps Forwarding Rate 1 2 Pure Gigabit Stack 1000BASE-X 1000BASE-X Figure 3 illustrates how the Catalyst 2912MF XL or Catalyst 2924M XL switch can be used in combination with Catalyst 3500 XL switches using the GigaStack GBIC half-duplex cascade feature. This configuration will provide the flexibility to implement a migration plan from legacy uplink connections to Gigabit Ethernet in the future. For example, each Catalyst 2924M XL switch may initially be used to support 100BASE-FX or ATM uplinks while still maintaining the full capabilities of Gigabit Ethernet stacking and compatibility with Cisco Switch Clustering Management. At any subsequent time, XL switches may be used to support a migration plan to Gigabit Ethernet fiber uplinks.
3 Figure 3 Half-Duplex GigaStack Cascade Configuration with Legacy Uplink Migration Flexibility Legacy Migration Example Catalyst 3548 XL Switches Later Migration to 1000BASE-SX Current Use Of 100BASE-FX Catalyst 2924M XL Catalyst 2924M XL Catalyst 2924M XL Switches Full-Duplex Configuration Options Customers can also use the GigaStack GBIC to create a low-cost dedicated Gigabit Ethernet connection between two stack members, providing a scalability option to increase overall stack bandwidth. When connecting two GigaStack GBICs with a single cable, the GBIC will autonegotiate to full duplex and provide a 1-Gbps forwarding rate in each direction or 2 Gbps. By simply changing the stack configuration from a cascade to a star configuration, customers can provide dedicated Gigabit Ethernet connectivity to each stack member. When combined with a Catalyst 3508G XL Gigabit Ethernet aggregation switch, this solution offers 5-Gbps connectivity to the stack. The Catalyst 3508G XL can aggregate up to eight stack member switches or 384 desktop ports, depending the number and type of uplink ports required. Users can also choose to implement higher levels of resiliency in their full-duplex GigaStack configurations. High levels of redundancy can be implemented within the wiring closet stack and on the network core uplinks. Within the wiring closet, a second Catalyst 3508G XL aggregation switch can be deployed with redundant links to each stack member. And, redundant uplinks can be deployed from the stack aggregator to the network core. When deploying redundant gigabit uplinks, users can benefit from link failover times that are significantly shorter than standard Spanning Tree protocols (STP). By implementing the Cisco Uplink Fast feature, failover can be minimized to as little as 1 to 2 seconds. In addition, the Cisco Per-VLAN Spanning Tree (PVST+) feature can be deployed to ensure that all redundant uplinks perform load balancing. In other words, all redundant uplinks are active and carry traffic. Users can achieve even higher levels of performance in their full-duplex stacks by configuring dual links from an aggregation switch to each stack member. The two Gigabit Ethernet ports on each desktop series XL switch can be grouped together using Gigabit EtherChannel technology to create a stack connection with a full-duplex 4 Gbps forwarding rate.
4 Figure 4 illustrates a switch stack configured with GigaStack GBICs operating in full-duplex mode. In this configuration, the Catalyst 3508G XL Gigabit Ethernet switch creates a 5-Gbps independent stack backplane across the member switches. Fault tolerance is implemented via a redundant Catalyst 3508G XL aggregation switch. High-speed uplinks from the Catalyst 3508G XL to the network core are provided via Gigabit EtherChannel technology. Figure 4 Full-Duplex GigaStack Star Configuration Point to Point at 2-Gbps Forwarding Rate GigaStack GBIC Catalyst 3508G XL 1 2 Gigabit Ethernet or Gigabit EtherChannel Uplinks Full Compatibility with Cisco Switch Clustering Management Technology Users can choose to deploy GigaStack stacking while benefiting from the powerful multidevice management technology available in Cisco Switch Clustering technology. Switch Clustering technology allows customers to manage a stack of devices within a wiring closet or a broadly dispersed set of devices across a campus as a single IP entity. Switch Clustering technology uses standard TCP/IP packets to distribute and collect management information for all switches in the cluster. Switch Clustering supports a broad range of physical interconnections, including the GigaStack GBIC. Key Features/Benefits Delivers a hardware-based, independent stack bus with 1-Gbps forwarding bandwidth in a half-duplex, cascade configuration, or up to a 2-Gbps forwarding rate in a point-to-point, full-duplex configuration Allows up to nine switches to be interconnected in a half-duplex, cascade stack configuration, forming a highly scalable 1-Gbps independent stack bus When deployed in full-duplex in combination with a Catalyst 3508G XL Gigabit Ethernet aggregation switch, provides a 5-Gbps independent stack backplane across stack member switches Standard GBIC form factor provides customers unprecedented flexibility in installation and deployment Offers many redundancy and resiliency options to ensure network availability Delivers a hardware-based stacking solution to Catalyst 3500 series XL switches and gigabit-enabled Catalyst 2900 series XL switches Full-/half-duplex autonegotiating automatically selects and optimizes bandwidth between interconnected switches Technical Specifications Performance 1 Gbps in half-duplex, cascade configuration; 2 Gbps in point-to-point, full-duplex configuration Supported Products Catalyst 2912MF XL Catalyst 2924M XL Catalyst 3508G XL Catalyst 3512 XL Catalyst 3524 XL Catalyst 3548 XL Standards IEEE 802.3z, IEEE 802.3x 1000BASE-X half/full-duplex specification Y2K Y2K compliant Connectors and Cabling Switch connection: GBIC-compliant connector Stacking connection: copper-based Cisco GigaStack cabling
5 Indicators Link integrity, disabled, activity, speed, and full-duplex indications Dimensions and Weight (H x W x D) 0.75 x 1.54 x 3.50 in. (1.90 x 3.91 x 8.89 cm) 1.8 oz. (56 grams) Environmental Conditions and Power Requirements Operating temperature: 32 to 113 F (0 to 45 C) Storage temperature: 13 to 158 F ( 25 to 70 C) Operating relative humidity: 10 to 85% noncondensing Operating altitude: up to 10,000 ft. (3000 m) Power consumption: 2W maximum; 6.8 BTU per hour MTBF 4.4 million hours Warranty Lifetime limited warranty Ordering Information Model Number: WS-X3500-XL (Cisco GigaStack GBIC and 50 centimeter cable for GigaStack GBIC) Cable: CAB-GS-1M (1 meter cable for GigaStack GBIC) For More Information on Cisco Products, Contact: U.S. and Canada: NETS (6387) Europe: Australia: Other: World Wide Web URL: Safety Certifications UL 1950 CSA 22.2 No. 950 EN IEC 950 AS/NZS 3260, TS001 CE Electromagnetic Emissions Certifications FCC Part 15 Class A EN 55022B Class A (CISPR 22 Class A) VCCI Class A AS/NZS 3548 Class A BCIQ CE Marking Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA USA Tel: NETS (6387) Fax: European Headquarters Cisco Systems Europe 11, Rue Camille Desmoulins Issy Les Moulineaux Cedex 9 France Tel: Fax: Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA USA Tel: Fax: Asia Pacific Headquarters Cisco Systems Australia, Pty., Ltd Level 17, 99 Walker Street North Sydney NSW 2059 Australia Tel: Fax: Cisco Systems has more than 190 offices in the following countries. Addresses, phone numbers, and fax numbers are listed on the Cisco.com Web site at /go/offices. Argentina Australia Austria Belgium Brazil Canada Chile China Colombia Costa Rica Croatia Czech Republic Denmark Dubai, UAE Finland France Germany Greece Hong Kong Hungary India Indonesia Ireland Israel Italy Japan Korea Luxembourg Malaysia Mexico The Netherlands New Zealand Norway Peru Philippines Poland Portugal Puerto Rico Romania Russia Saudi Arabia Singapore Slovakia Slovenia South Africa Spain Sweden Switzerland Taiwan Thailand Turkey Ukraine United Kingdom United States Venezuela Copyright 2000, Cisco Systems, Inc. All rights reserved. Printed in the USA. GigaStack is a trademark; and Catalyst, Cisco, Cisco IOS, Cisco Systems, the Cisco Systems logo, and EtherChannel are registered trademarks of Cisco Systems, Inc. or its affiliates in the U.S. and certain other countries. All other trademarks mentioned in this document are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0007R) 09/00 BW6599
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