D-LinkTM xStackTM Switch Series Meeting the Need at the Edge of the Network White Paper October 2004 Abstract This white paper provides an overview of how the xStack Switch Series by D-Link Systems, Inc. implements state-of-the-art technology to address critical requirements at the edge of the network.
Executive Summary The way in which businesses use LANs is changing and the performance requirement at the edge of the network is becoming more demanding. IP Telephony and other collaborative applications are driving more traffic to the edge of the network. As file sizes continue to grow, users need more bandwidth. Quite simply, the convergence of voice, video, data, and storage enables users to do more from their desktop.
When used with single-mode optical fiber, 10-Gigabit Ethernet has an operating range of up to 40 miles. This operating range and its very high speed make 10-Gigabit Ethernet a viable alternative for linking large corporate LANs and for connecting datacenters, server farms, and storage area networks (SANs) within a campus or metropolitan area.
APPLICATIONS FUEL DEMAND FOR 10-GIGABIT ETHERNET Enterprises should consider deploying 10-Gigabit Ethernet as soon as possible, given that 1-Gigabit Ethernet is already migrating from servers at the core of the network to specialized workstations and is starting to reach desktops at the edge of the network.
xStack Models xStack Series switches are designed to provide high-density Gigabit desktop connectivity and 10GbE to the core for mid-size and large Enterprise customers.
xStack Series Benefits Industry’s highest density Gigabit Ethernet for easy scalability and efficient use of rack space.
Complete Solution for Mid-Sized Businesses & Enterprises Whether you need to bring Gigabit or just conventional 10/100Mbps speed to your organization's desktops, D-Link's xStack Series has the right solution with the right port types, port densities, and uplinks to match your requirements.
Layer 3 Wire-speed Packet Routing Layer 3 IP routing performed at the switch level offloads the routing burden handled by a network router, thus enabling the network to run more efficiently. xStack switch’s Layer 3 IP routing provides support for RIP v.1, v.2, OSPF, and DVMRP protocols performed by on-board ASICs at speeds many times faster than CPU-based routers.
IGMP snooping xStack switches feature IP Multicast support by examining (‘snooping’) all Internet Group Multicast Protocol (IGMP) traffic in hardware at line rate, and pruning unwanted data streams from affecting network or end-station performance. Network performance will become more efficient and load processing can be reduced dramatically.
Comprehensive Security D-Link's xStack Series provides a complete set of security features for connectivity and access control. The features includes Access Control Lists (ACLs) based on MAC address, switch port, IP address, and/or TCP/UDP port numbers, 802.1x user authentication and MAC address control. The xStack also provides central management for administration access via TACACS/TACACS+ and RADIUS.
Secure Shell 2 (SSH2) xStack Switches support SSH2 to securely transfer switch configurations and images into and out of the switch. To fix the known limitations in SSH, it is critical that customers use the latest SSH2 as supported in the xStack Series. Virtual Router Redundancy Protocol (VRRP) Support D-Link's xStack supports Virtual Router Redundancy Protocol (VRRP), allowing several Layer 3 switches on a multi-access link to utilize the same virtual IP address.
Jumbo frame support for larger file applications Jumbo frame support of up to 9,216 bytes is supported, making the xStack Series ideal switches for new applications requiring large frames such as storage and graphic/video applications. Network data will stream more efficiently and processing load can be reduced dramatically. Rate Limiting The central flow control rate limiting feature in the xStack Series adds a valuable tool for bandwidth management on ingress traffic.
can be located in different physical locations in a network. For example, SIM-capable switches can be located across a single building connected through industry-standard copper cables, or in different buildings across campuses connect by industry-standard fiber cables.
xStack Technology Overview The D-Link xStack technology provides an innovative new method for collectively utilizing the capabilities of a stack of switches. Individual switches intelligently join to create a single switching unit. Configuration and routing information is shared by every switch in the stack, creating a single switching unit. Switches can be added and deleted from a working stack without affecting performance.
D-Link xStack Technology Bi-directional Fail-Safe Stacking Bi-directional fail-safe stack architecture. Stack Up to 12 units in a Ring topology Stack up to 7 units in a Star topology. Subsecond Failover in Ring-Stacking Within microseconds of a breakage of one part of the path, all data is switched to the active half of the bi-directional path. The switches continually monitor the stack ports for activity and correct data transmission.
When connected to a group, each switch will use the stack IP address. When a new master is elected, it uses this IP address to continue interacting with the network. Stack Creation and Modification Stacks are created when individual switches are joined together with stacking cables. When the stack ports detect electromechanical activity, each port starts to transmit information about its switch.
Subordinate Switch Activities Each switch has tables for storing its own local MAC addresses as well as tables for the other MAC addresses in the stack. The master switch keeps tables of all the MAC addresses reported to the stack. The master also creates a map of all the MAC addresses in the entire stack and distributes it to all the subordinates. Each switch becomes aware of every port in the stack.
Summary The D-Link xStack Switch Series provides Gigabit and 10-Gigabit speeds with advanced switching features to increase the resiliency and the versatility of any network edge. With the xStack Multilayer Switch Series, D-Link meets the switching demands of growing medium and large businesses.
xStack Multilayer Stackable Gigabit Switches DGS-3324SRi DXS-3326GSR 24-Port L3 Gigabit Star-Stacking MasterSwitches & 24-Port L3 Gigabit Switch 24-Port 10/100/1000BASE-T Ports 8-Port Combo SFP 6-Port 10GbE Stacking 1-Slot Compact Flash to store configuration file 24 SFP 4-Port Combo SFP 2-Port 10GbE Stacking 10GbE Uplink Module (optional) DGS-3324SR 24-Port L3 Gigabit Switch DEM-420X Optional 10G Uplink Module 24-Port 10/100/1000BASE-T Ports 4-Port Combo SFP 2-Port 10GbE Stacking 10GbE Module with two
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