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Nortel Accelar™ 1000 Series

The new economics of networking: gigabit switching and wire-speed routing at traditional switch prices.

The Accelar™ 1000 Series of routing switches from Bay Networks, a Nortel Networks Business, represents a new technology in high-performance networking: the performance of ultra high-speed packet forwarding combined with the control of Internet Protocol (IP) and IPX (Internet Packet Exchange) routing. By delivering extensive bandwidth, intelligence to minimize the impact of broadcast traffic, and support for low-latency, time-sensitive multimedia applications, Accelar routing switches provide a foundation for future network needs.

In addition to supporting Gigabit Ethernet technology, Accelar 1000 routing switches support conventional 10 Megabits per second (Mbps) Ethernet and 100 Mbps Fast Ethernet. By offering support at all three speeds, Accelar routing switches provide a smooth migration path to 1000 Mbps, while continuing to support existing Ethernet and Fast Ethernet environments.

A key part of Nortel Networks' Unified Networks™ solution, the Accelar 1000 Series supports the high-speed IP intranets of the future. Include Accelar routing switches in your network and you get:
7 million packets per second (pps) capacity to aggregate large switched networks
Wire-speed IP and IPX routing to accommodate new application requirements
Policy-based application priority and access security at wire speed

The net effect is to create a high-performance intranet within your existing enterprise network architecture, without adding new protocols or complex schemes.

As a result, you can add new routing switch technology without reconfiguring your existing equipment.

No matter what the size of your network or the shape of your budget, we offer an Accelar routing switch that's right for you. Choose from among six flexible designs:
Accelar 1200 (8-slot chassis)
Accelar 1250 (4-slot chassis)
Accelar 1100 (16-port 10/100BASE-TX standalone configuration with two expansion module slots).
Accelar 1150 (4-port 1000BASE-SX Gigabit Ethernet standalone configuration with two expansion module slots).
Accelar 1050 or 1051 (Both offer a fixed-configuration with 12 ports of 10/100BASE-TX Ethernet and one port of 1000BASE-SX Gigabit Ethernet. The 1051 adds LinkSafe™ redundant gigabit links).

The Accelar 1000 Series provides seamless, standards-based interoperation with all Bay Networks Ethernet and Fast Ethernet hub and router products. This breakthrough product category offers a key addition to the industry's most complete enterprise networking solution.
Turbocharged IP and IPX Networks
Hardware-Based Routing and Switching
Gigabit Performance with Layer 2, Layer 3, and Layer 4 Control
Business Critical Resilience
Application-Level Prioritization
Distributed Access Security
Year 2000 Compliant
Benefits [ TOP ]  

Gigabit Performance with Layer 3 and Layer 4 Control
The Accelar 1000 Series is based upon recent advances in application-specific integrated circuit (ASIC) capabilities, creating a new generation of high-speed switches that combine Layer 2 switching, Layer 3 routing, and Layer 4 policies. These routing switches handle packet forwarding tasks in ASICs instead of assigning them to the Central Processor Unit (CPU) as with previous designs.

CPUs are a shared resource on typical switches and routers, so their performance suffers under heavy network loads. These performance drop-offs can be eliminated however, by using a distributed ASIC-based architecture, enabling such features as Virtual LANs (VLANS), and priorities, to run at high levels. This innovative ASIC technology makes the Accelar 1000 Series of powerful routing switches capable of implementing all features associated with Layer 3 protocols, supporting switching and routing on any port at full wire speed. Additionally, Layer 4 information can be examined on a packet-by-packet basis, providing advanced "application- based" prioritization and filtering.

Application Intelligence
The Accelar 1000 Series of routing switches delivers application intelligence without the complexity of routing.

IP flow filters deliver application prioritization and distributed access security. These two advanced features eliminate the effects of congestion and intrusion on business-critical applications. IP flow filters enable Accelar routing switches to make intelligent decisions based on the application, user, department, or any combination contained in network traffic.

Application-level prioritization can empower you to prioritize mission-critical applications like SAP, Baan, Oracle Financials, or PeopleSoft over less time-sensitive applications like PointCast or e-mail. Application prioritization ensures that network congestion does not affect mission-critical applications.

Accelar routing switches offer distributed access security, using wire-speed traffic filtering that can also be based upon application, user, department, or any combination contained in network traffic. Unlike other routing switches, Accelar is able to filter at wire speed, with no deterioration in performance. Wire-speed filtering is another innovative ASIC feature of Accelar. Access lists can also be used to filter traffic by controlling whether packets are forwarded or dropped, based upon the policy specified within the access lists. With distributed access security, you can deny access to SAP or Oracle Financials servers for all members of the Engineering department while simultaneously granting access to the Finance department.

High-Speed Intranet Support
The internal switch fabric of Accelar 1000 routing switches provides aggregate forwarding capacity up to 7 million pps. This high-throughput architecture delivers ample capacity for supporting a high-performance multiprotocol infrastructure in enterprise networking environments. Accelar routing switches deliver wire-speed IP and IPX routing in hardware. Accelar, in conjunction with an existing multiprotocol router, supports all protocols including AppleTalk, NetBIOS, System Network Architecture (SNA) and DECnet.

Accelar 1000 routing switches provide a low-latency path through the network for "streaming" applications such as voice and video. Though traditional routers can prioritize traffic, they still introduce unacceptable latency for many real-time applications, particularly when the stream must endure multiple router hops. Accelar 1000 routing switches eliminate concerns about router hop latency.

Accelar 1000 routing switches support multiple Quality of Service (QoS) levels to deliver extremely low latency for priority traffic, even when switching or routing millions of packets per second. Multiple QoS levels enable the switches to support the most demanding multimedia requirements. In addition, separate queuing and priority for IP multicast traffic is supported, providing a simple way to offer video multicasts on your corporate network without the typical brownouts introduced by bursty traffic.

Year 2000 Compliant
All Accelar routing switches have been tested and certified Year 2000 compliant according to the test cases identified in Bay Networks Year 2000 Test Strategy/Plan.

Cost-Effective Flexible Design
The Accelar 1000 Series features six cost- effective configurations: two modular form factors, two standalone configurations with expansion slots, and two fixed-configuration form factors.
Accelar 1200 Routing Switch (8-slot modular chassis)
The Accelar 1200 can be configured with up to 12 Gigabit Ethernet ports, up to 96 autosensing 10/100BASE-TX Ethernet ports, ninety-six 100BASE-FX ports for fiber connectivity, or with a combination of the three technologies. For enhanced reliability, the Accelar 1200 switch can be equipped with redundant power, redundant gigabit links (LinkSafe), and redundant switch fabric modules. All modules are hot-swappable. The Accelar 1200 is ideal for high-density backbone and network center applications.
Accelar 1250 Routing Switch (4-slot modular chassis)
The Accelar 1250 can be configured with up to 6 Gigabit Ethernet ports, up to 48 autosensing 10/100BASE-TX Ethernet ports, forty-eight 100BASE-FX ports, or with a combination of the three technologies. All modules are hot-swappable. The Accelar 1250 can be equipped with LinkSafe redundant Gigabit modules and is ideal for backbone and network center applications.
Accelar 1100 Routing Switch (Standalone unit)
Supporting Gigabit Ethernet, 100BASE-FX, or additional 10/100 Mbps Ethernet ports, the Accelar 1100 base unit includes 16 autosensing 10/100 Mbps Ethernet ports with two built-in expansion slots for field-installable modules. The 1100 can be equipped with redundant power and LinkSafe. All modules are hot- swappable. The Accelar 1100 is ideal for the backbone switch of medium-size businesses, power workgroups, and server farms
Accelar 1150 Routing Switch (Standalone unit)
Supporting 10/100 Mbps Ethernet, 100BASE-FX, or Gigabit Ethernet additional ports, the Accelar 1150 base unit includes 4 Gigabit Ethernet ports with two built-in expansion slots for field-installable modules. The 1150 can be equipped with redundant power and LinkSafe. All modules are hot- swappable. The Accelar 1150 is ideal for the backbone switch of medium-size businesses and server farms.
Accelar 1050 and 1051 Routing Switches (Fixed configuration units)
Supporting 1 port of 1000BASE-SX and 12 ports of autosensing 10/100BASE-TX, the Accelar 1050 cost effectively brings application intelligence, such as application-level prioritization and access security, to the wiring closet. And the Accelar 1051 adds LinkSafe physical gigabit redundancy. The 1050 and 1051 are ideal for aggregation of 10/100 desktop switches to extend application intelligence to the wiring closet.

Figures 1-3 depict the individual members of the Accelar 1000 Series.

Figure 1:       Accelar 1000 Series – Modular
 

Figure 2:       Accelar 1000 Series – Standalones with Expansion Slots

Figure 3:       Accelar 1000 Series – Fixed Configuration
 

Features [ TOP ]  

Management
Designed for ease of management on both UNIX and personal computer (PC) platforms, the Accelar 1000 routing switch device manager software operates on Sun Microsystems Solaris, HP-UX workstations, IBM AIX, as well as PCs running Windows 95 or Windows NT. The graphical interface provides easy-to-use integrated switching and routing configuration services, and a simple, drag-and-drop VLAN manager supports simultaneous configuration of multiple switches. Management is also supported by Bay Networks Optivity® network management software.

Accelar 1000 routing switches feature Web-based configuration management. This enables network managers to easily access the routing switch using port-based out-of-band management, as well as any browser. The Accelar 1000 Series supports four remote monitoring (RMON) groups on each port: statistics, history, alarm, and events. In addition, port mirroring enables network managers to unobtrusively monitor traffic from a single port, two ports, or matching defined Media Access Control (MAC) addresses. Network managers can use a network analyzer or an RMON probe to further analyze traffic flows.

ASCII and Binary Configuration File Support
Accelar 1000 routing switches deliver flexible configuration file management, offering remote configuration file backup management for both binary configuration files and ASCII-encoded configuration files. Either configuration file type can be copied from a switch to a workstation for safekeeping, and can be downloaded back to an Accelar product as necessary. ASCII-based configuration files simplify the network manager's task of device configuration by allowing the network manager to perform remote, ASCII-based configuration file management and to download configuration files directly to Accelar products. The network manager can either partially or completely change the switch configuration offline, then transfer the new configuration directly to an operating routing switch without rebooting the switch. An example of the benefit of this feature is that the network manager can change Open Shortest Path First (OSPF) passwords, send the updated passwords to several running Accelar routing switches, and implement the new passwords, all without having to reboot the switches.

Configuration Flexibility
All Accelar 1000 routing switches can be initially deployed as high-capacity Layer 2 switches, with IP and IPX routing activated when needed. Eliminating the performance penalty previously associated with Layer 3 traffic greatly simplifies network design and delivers enormous benefits to the network manager. Accelar routing switches support up to 24,000 addresses per switch to provide capacity for large network configurations.

A wide range of interconnect modules is available for insertion into the Accelar 1000 Series of routing switches.

Long-Distance Gigabit
The Accelar Long-Distance Gigabit modules break through the standard Gigabit Ethernet distance limitation. These modules take advantage of high-performance optical transceivers that permit the extension of gigabit up to 50 km, well beyond the Institute of Electrical and Electronics Engineers (IEEE) specification of 5 km. Bay Networks has extended gigabit with Long-Distance Gigabit modules for both the Accelar modular and standalone products. These modules are an ideal solution for enterprise customers seeking to interconnect multiple high-performance campus networks across a metropolitan area network over dark fiber.

Multiple Priority Queues
In high-traffic networks, independent switch fabric queuing prevents head-of-line blocking, maintaining performance even under heavy broadcast/multicast loads. In addition, dual-unicast and dual-multicast priority queues provide low-latency delivery even during times of network congestion, protecting time-sensitive multimedia traffic and business-critical data traffic.

Fail-Safe Resiliency
In mission-critical environments, the Accelar 1200 offers several features designed to provide high levels of reliability. To protect against switch or processor faults, users can install a second Silicon Switch Fabric (SSF) CPU module. This feature enables the Accelar 1200 to continue operation in the event of a primary CPU failure. To provide increased reliability, the Accelar 1200, 1100 and 1150 accept redundant power. To guard against cable faults, optional LinkSafe redundant Gigabit link modules can be installed in the Accelar 1200, 1250, 1100, 1150 and 1051 products. LinkSafe provides physical layer redundancy and automatic switch-over on Gigabit Ethernet ports.

MultiLink Trunking
MultiLink Trunking (MLT) enables backbone trunks, wiring closet risers, and server connections to scale from 100 Mbps to 8 Gbps. MLT flexibly delivers added bandwidth by aggregating multiple physical ports, enabling them to act like a logical single port. This gives customers an option to aggregate 2 to 4 Accelar ports into a single logical connection with up to 4 times the bandwidth.

Redundant MultiLink Trunking
Redundant MLT allows each port of the trunk group to reside on a different Accelar routing switch module or BayStack™ 450 unit. This provides all the scalability advantages of MLT with significantly higher resiliency for risers, backbone trunks, and server connections. Communication continues following the unlikely event of a failure because each physical port of the trunk group resides on a separate Accelar module or BayStack 450 unit.

In addition, Accelar routing switches support the Virtual Router Redundancy Protocol (VRRP), which provides redundancy for the default routing path without requiring reconfiguration of dynamic routing or router discovery protocols on every host. Designed to eliminate the single point of failure inherent in the static default routed environment, VRRP provides an alternate default gateway, which is transparent to applications and workstations.

Robust VLAN Support
The Accelar 1000 Series enables network managers to create up to 127 port-based or policy-based VLANs. VLANs can be based on switch port or by protocol. Protocols supported include IP, IP-subnet, IPX, NetBIOS, DECnet and SNA. Membership in workgroup segments can be determined logically instead of by user location, and adds, moves, and changes can be easily configured as the network evolves. Unlike typical Layer 2 switches, the Accelar 1000 Series examines each packet for Layer 2 or Layer 3 policies, resulting in more secure and robust VLANs. Standards-based VLAN trunking (802.1Q) on all ports allows multiple logical links on a single interface between switches, or between the switch and multiple servers.

More specifically, IP subnet-based VLANs allow network managers to create VLANs based on IP address prefixes. The creation of subnet-based VLANs enables multinetting support, by permitting multiple subnets on a single Accelar interface. Multinetting and IP subnet-based VLANs allow the number of host addresses to be expanded beyond the subnet limitation. For example, a physical location, like a floor of a building, is no longer limited to the number of hosts within a single subnet. A second subnet can be added to enable end-user growth.

Lastly, the Accelar supernetting feature permits the grouping of smaller subnet address spaces to make one larger supernet. Supernetting overcomes the small address space limitation associated with class C addressing and allows IP addresses to be used in the most efficient way. Supernetting accomplishes this by enabling the aggregation of contiguous IP network numbers beyond the class boundary. Classless Inter-Domain Routing (CIDR) enables supernetting and, in general, makes all IP addressing combinations legal. CIDR also allows an IP subnet structure that ignores the normal position dependencies associated with standard IP addressing.

MAC-based VLANs
Accelar products support MAC-based VLANs. MAC-based VLANs offer the network manager the capability of defining a VLAN composed of specific end stations. MAC-based VLANs are primarily used for security.

In a MAC-based VLAN, members are associated only if the end station MAC address is contained in a predefined list of allowed MAC addresses. By combining MAC-based VLANs with other policy-based VLANs, certain users can be permitted to access specific services that may be granted or denied to other users. This is true even when multiple users are connected to a single Accelar switch port via a shared media hub or another switch.

One example of the use of MAC-based VLANs is in an educational environment where instructors are granted access to certain file servers and applications, while students are not. A MAC-based VLAN can be defined for instructors, which grants restricted access to resources such as administrative file servers. The network manager can also define a different MAC-based VLAN for students, which blocks access to administrative file servers. In this example, the MAC-based VLAN for the instructor can be combined with other policy-based features to grant or deny access across the entire campus, allowing instructors to "roam" through the campus while retaining all security and access rights. Accelar routing switches allow the two MAC-based VLANs, instructor and student, to overlap on the same switch ports.

Advanced Routing Functionality: IPX Routing
The Accelar 1000 Series now delivers all the advantages of routing switch technology to Novell NetWare and the IPX protocol. Accelar products offer scalable and resilient, wire-speed, hardware-based IPX routing support. IPX routing, when combined with existing Accelar support for hardware-based, wire-speed IP routing and Layer 2 switching, offers customers high performance, multiprotocol switching and routing across an entire campus.

IPX routing is fully integrated into ASICs distributed onto Accelar 10/100/1000 line cards. ASIC technology delivers low-latency, wire-speed performance, application priority, and distributed access security to end users and applications utilizing the IPX protocol. IPX support can be enabled or disabled for each Accelar interface, ensuring that the IPX protocol is supplied only to those portions of a network that require IPX support. Support is included for the IPX Service Advertisement Protocol (SAP) and the IPX Routing Information Protocol (RIP). Support is also included for both default and static routes.

IP Multicast Routing/IGMP Snooping
Accelar 1000 routing switches offer native-mode IP Multicast routing support, enabling high-performance and cost effective IP Multicast applications such as distance learning and videoconferencing across the Enterprise campus. At least one IP Multicast router must be present in a network to enable IP Multicast routing, and Accelar products provide this functionality.

IP Multicast provides the most efficient means of delivering multimedia applications, such as desktop videoconferencing and distance learning, through an IP network. Networks that lack multicast support must either broadcast multiple-receiver application streams or send individual packet streams to each requesting user within a network. Both alternatives waste network bandwidth.

Accelar products support native-mode IP Multicast routing via the Distance Vector Multicast Routing Protocol (DVMRP). Accelar products also manage the process that end stations use to join and leave multicast streams via the Internet Group Management Protocol (IGMP). Accelar routing switches support IGMP versions 1 and 2.

Accelar routing switches optimize IP multicast in switched VLAN environments by forwarding IP multicast traffic only to ports with group members. IP multicast support reduces the overall network load generated by applications that need to be viewed by many people at one time. For example, live Cable News Network (CNN) feeds can be multicast across an enterprise network without the traffic being forwarded to all segments and users. It is only forwarded to end users that have requested membership in the multicast group. Network devices use IGMP to join multicast groups. Accelar routing switches listen to IGMP report messages to determine on which VLAN, or switch port, a multicast group member is connected, thereby forwarding the multicast traffic to only the ports with group members.

In addition, Accelar routing switches can implement source and destination IGMP filtering. This feature allows network managers to control access to certain multicast streams by denying individual requests to join a multicast group. IGMP filtering also limits multicast transmissions to only authorized devices on the network. This restricts unauthorized users from streaming multicast traffic across the network. IGMP filtering is configured based on IP source and destination addressing by Accelar routing switching implementing IGMP snooping.

Accelar products support up to 1024 separate IP multicast streams within a network, providing robust IP Multicast services for enterprise networks.

Routing over Equal Cost Paths
Many of today's businesses measure network downtime in millions of dollars per minute. Equal Cost Multipath (ECMP) routing support furnishes network managers with yet another advanced routing tool to design the business-critical campus local area network (LAN). With ECMP, network managers can increase the capacity of backbone trunks and risers and virtually eliminate network downtime.

ECMP is used to increase the capacity of backbone trunks beyond the current limitation of 4 Gbps full duplex of Gigabit MultiLink Trunks by allowing multiple trunks between the same two points. Backbone trunk capacity is increased by load sharing over multiple logical paths between Accelar routing switches. Rather than requiring extra paths to remain in standby mode, ECMP allows up to 4 paths to pass traffic simultaneously. Used in combination with MultiLink Trunking, 2 ECMP routing form an 8 Gbps trunk between switches can be created: Four gigabit ports would represent one logical trunk, and another four gigabit ports would represent a redundant, yet load-sharing trunk.

Network resiliency improves with ECMP by allowing more than 4 physical ports to interconnect any two Accelar routing switches. If one path goes down, traffic is simply rerouted over another link without the downtime of Spanning Tree convergence.

ECMP also enables multi-homed risers, which extends the resilience of a mesh-based backbone to the wiring closet. Multi-homed risers allow an Accelar routing switch in the wiring closet to have simultaneous active riser connections to two distinct switches in the network backbone. Traffic is load balanced over each link during normal network operation. Traffic is automatically rerouted over the other link in the event of backbone trunk or multi-homed riser failure.

Default and Static Routes Pointing to an Indirectly Connected Address
The Accelar product line simplifies the network manager's task of defining the default route to routers or routing switches that connect to other networks. A default route is used to direct packets to the address of another router or routing switch that contains routing table entries not maintained in the routing table of the current router or routing switch. For example, a default route might point to an address on another router in a network that attaches to the Internet. Many routers allow the default route to point only to a router directly connected to the current router (the "next hop" router).

Accelar products allow the default route to be defined for an address on a router that is not directly connected to the current router and that might, in fact, be several router hops away from the current router.

The network manager can define the default route on the current Accelar switch to point to the address of a default router or routing switch that may be several hops away from the current Accelar switch. During operation, the Accelar switch determines the next hop for a packet destined for the default router based upon a static or dynamic routing entry in its routing table.

This saves the network manager the added effort of having to define the default router address hop by hop through each router in the path to the actual default router. Another benefit of this feature is that the network manager can define the same default router address for multiple routing switches in the network.

UDP Broadcast Forwarding
Accelar routing switches support a rich set of Uniform Datagram Protocol (UDP) broadcast forwarding capabilities, simplifying the challenges that network managers face. UDP broadcast forwarding enables the centralization of network services by allowing the network manager to convert UDP broadcast messages to IP unicast messages, and control how and where the UDP broadcasts are sent for processing.

UDP broadcast forwarding is particularly useful for networks containing centralized configuration, security, file management, and name management, such as IP address and end system name management. Certain IP applications rely on UDP broadcasts to request information or network services, or to locate applications and servers on a network. If a host needing a service resides on a subnet that does not have a locally attached server, UDP broadcasts from an end station are, by default, dropped instead of being forwarded.

Accelar routing switches use the UDP broadcast forwarding facility to convert UDP broadcasts to unicast messages, which identify a specific host and can be sent anywhere in the network for processing. The converted unicast packet contains the specific IP address of the server that is able to process the request, enabling the message to be sent to the appropriate server on a different subnet.

UDP broadcast forwarding is implemented through profiles, which offer the network manager great flexibility in configuring UDP broadcast destinations and paths. The network manager creates profiles, as appropriate, to direct each type of UDP broadcast to an appropriate server. The network manager also uses the profile to choose the routing interface or interfaces that will forward each type of UDP Broadcast.

UDP broadcast services supported by Accelar routing switches include:
Time Service
Terminal Access Controller Access Control System (TACACS) Service
Domain Naming System
Trivial File Transfer Protocol (TFTP)
NetBIOS Name Server
NetBIOS Datagram Server

Combined Routing and Bridging on Individual Ports
Accelar routing switches support simultaneous routing of IP and bridging of other protocols on a single interface, preventing OSPF and RIP convergence from being dependent upon Spanning Tree convergence. Network managers can now design mesh-based, scalable, resilient campus networks, with multiple active links without the limitations of Spanning Tree on IP traffic. Multiple active links in the backbone add capacity for carrying traffic between switches. Resilience in the backbone improves because the time to reroute IP traffic around a network failure decreases by removing the dependence on Spanning Tree.

For example, switches A, B, and C are connected together in a mesh and transmit IP, IPX, and AppleTalk across the backbone. Spanning Tree will force one of the links, perhaps the link between A and C into a stand-by status even though routing is enabled. This precludes the standby link from passing any traffic under normal circumstances and restricts the reaction time to network failures for IP and non-IP protocols to that of Spanning Tree. Reaction to link failures must first deal with the downtime associated with Spanning Tree convergence, then the convergence of OSPF or RIP.

Conversely, with simultaneous bridging and routing, switches A, B, and C are configured to simultaneously route IP and bridge the other protocols. This allows all links to remain active under normal circumstances–greatly increasing the capacity of the backbone. In addition, it speeds the reaction to network failures, because IP traffic is routed around the failure according to the fast convergence times of OSPF or RIP. This feature removes the convergence time of Spanning Tree for IP traffic. Non-IP traffic would still be subject to the longer convergence times of Spanning Tree.

System Architecture
Traditional multiprotocol routers rely on software-based forwarding, making wire-speed routing impossible. Even with today's powerful CPUs, processor intervention in packet forwarding limits performance to about 1 million pps. To deliver additional performance, the Accelar 1000 Series removes the processor from forwarding decisions and uses hardware-based ASIC technology for packet forwarding. This enables traffic, such as business-critical data, compressed video, or other multimedia applications, to cross subnets without suffering performance degradation. This revolutionary new architectural approach to routing delivers packet forwarding at rates up to 7 million pps. Accelar 1000 routing switches contain two main hardware components: the SSF CPU module and the I/O modules (see Figure 4).

Figure 4:       Accelar 1000 Series System Architecture.

Silicon Switch Fabric
The SSF is the core of the switch and is where the actual packet forwarding occurs. This CPU module performs all protocol functions, including support for Spanning Tree, bridge learning functions, and standard routing protocols; these include RIP, RIPv2, OSPF, IPX RIP, and SAP. Routing and bridging tables computed by the CPU are stored in 16 MB of main memory and are distributed automatically to each I/O card for distributed address lookup. Packet forwarding information is derived from these distributed routing tables and forwarded by the Address Resolution Unit (ARU) ASICs on the I/O modules.

I/O Modules
Packet forwarding decisions are made independently on the I/O modules through ARUs. In addition, the I/O modules provide the interface to the network and buffering.

The ARU maintains its own address table for both routed and switched traffic, and can contain up to 24,000 entries. Local routing and address switching enable the ARU to resolve addresses and forward packets through the switch fabric, independent of the CPU.

The forwarding engine also checks each packet against current network policies, and, if appropriate, delivers priority service. Priority policies can be based on physical port, VLAN ID, multicast destination, Resource Reservation Protocol (RSVP) flow, or deep packet filtering. Deep packet filtering enables Accelar routing switches to look up any bit or byte in the Layer 2, Layer 3, or Layer 4 header, and delivers an intelligent service like priority or access security. Dual priority queues are provided: one for high-priority, business-critical traffic, and one for lower-priority traffic. Each Gigabit Ethernet port, or set of four Fast Ethernet ports, is equipped with 1 MB of output queue memory, ensuring timely delivery of data across the network.
Applications [ TOP ]  

Accelar 1000 routing switches can be successfully deployed across the enterprise network, creating numerous topologies (see Figure 5).
For campus backbones burdened with unpredictable intranet traffic flows, the routing switches provide extensive Gigabit Ethernet bandwidth to support policy-based traffic prioritization and graphical VLAN configuration.
For riser connectivity to the network center, multiple high-density 10/100 Mbps segments can be aggregated into single or multiple Gigabit Ethernet links.
For central server farms, the routing switches provide maximum throughput with no modification needed in protocol stacks or applications.
Power workgroups gain high-bandwidth Gigabit Ethernet paths to local servers, while wire-speed routing virtually eliminates latency for remote intersubnet sessions.
Wiring closet Layer 2 (data link layer) 10/100 switches can be aggregated into any one of six Accelar models, running gigabit, 100BASE-TX or 100BASE-FX from the wiring closet to the data center.

Figure 5:       Accelar 1000 Series in the Enterprise Networking Environment.

Technical Specifications [ TOP ]  

Table 1:       Accelar 1000 Series Technical Specifications.
Performance Throughput 
Model XLR1200 7.0 Gbps 
Model XLR1250 3.5 Gbps 
Model XLR1100 4.5 Gbps 
Model XLR1150 7.0 Gbps 
Model XLR1050 2.2 Gbps 
Model XLR1051 2.2 Gbps 
Routing/Switching Forwarding Rates 
Model XLR1200 7.0 million pps 
Model XLR1250 5.0 million pps 
Model XLR1100 6.5 million pps 
Model XLR1150 7.0 million pps 
Model XLR1050 3.3 million pps 
Model XLR1051 3.3 million pps 
Prioritized Output Buffering 
Model XLR1200 96 MB, 1 MB per port (fully loaded chassis) 
Model XLR1250 48 MB, 1 MB per port (fully loaded chassis) 
Model XLR1100 32 MB, 1 MB per port (fully loaded chassis) 
Model XLR1150 20 MB, 1 MB per port (fully loaded chassis) 
Model XLR1050 16 MB, 1 MB per 10/100 port and 4 MB per 1000BASE-SX port  
Model XLR1051 16 MB, 1 MB per 10/100 port and 4 MB per 1000BASE-SX port  
Gigabit Ethernet Specifications Fiber Type Diameter (microns) Modal Bandwidth (Mhz*km) Minimum range (meters) 
1000BASE-SX 
  MM 62.5 160 2 to 220 
  MM 62.5 200 2 to 275 
  MM 50.0 400 2 to 500  
  MM 50.0 500 2 to 550 
1000BASE-LX 
  MM 62.5 500 2 to 550 
  MM 50.0 400 2 to 550 
  MM 50.0 500 2 to 550 
  SM 9.0 NA 2 to 5000 
Shared Memory Switch Fabric 
  2 MB (with prioritization) 
IP Routing and Switching Speeds 
  Wire speed for 10/100/1000 Mbps Ethernet ports 
Latency 
  Less than 10 microseconds (LIFO) 
Routing Protocols  
  RIP, RIP2, OSPF, IPX RIP, IPX SAP, IGMP, Distance Vector Multicast Routing Protocol (DVMRP) 
Bridging and VLAN Protocols 
  Up to 127 VLANs defined by port or policy (IP subnet or protocol) 
  802.1Q trunking 
  802.1d multiple Spanning Tree group support 
  IP multicast optimization via IGMP snooping 
  IP multicast routing via DVRMP and IGMP 
Prioritization 
  Policy-based by port, IP flow, and deep packet filtering 
Address Support 
  24,000 table entries 
Physical Dimensions 
Model XLR1200 (H) 10.5 in. x (W) 17.5 in. x (D) 16 in. [(H) 26 cm x (W) 44 cm x (D) 41 cm] 
Model XLR1250 (H) 6 in. x (W) 17.5 in. x (D) 16 in. [(H) 15 cm x (W) 44 cm x (D) 41 cm] 
Model XLR1100 (H) 3.5 in. x (W) 17.5 in. x (D) 16 in. [(H) 9 cm x (W) 44 cm x (D) 41 cm] 
Model XLR1150 (H) 3.5 in. x (W) 17.5 in. x (D) 16 in. [(H) 9 cm x (W) 44 cm x (D) 41 cm] 
Model XLR1050 (H) 2.76 in. x (W) 17.3 in. x (D) 13.5 in. [(H) 7 cm x (W) 44 cm x (D) 34 cm] 
Model XLR1051 (H) 2.76 in. x (W) 17.3 in. x (D) 13.5 in. [(H) 7 cm x (W) 44 cm x (D) 34 cm] 
Weight (fully loaded) 
Model XLR1200 70 lb (31 kg) 
Model XLR1250 37 lb (17 kg) 
Model XLR1100 25 lb (11 kg) 
Model XLR1150 25 lb (11 kg) 
Model XLR1050 10.7 lb (4.6 kg) 
Model XLR1051 10.7 lb (4.6 kg) 
Power Requirements 
Line Frequency 50 to 60 Hz 
Input Voltage 100 to 240 VAC 
Power Consumption 
Model XLR1200 284 W max 
Model XLR1250 284 W max 
Model XLR1100 120 W max 
Model XLR1150 120 W max 
Model XLR1050 90 W max 
Model XLR1051 90 W max 
Environmental Specifications 
Operating Temperature 0° to 40° C (32° to 104° F) 
Operating Humidity 10 to 85%, noncondensing 
Operating Altitude 8,000 ft max 
Storage Temperature -25° to 70° C (77° to 158° F) 
Storage Humidity 95% maximum humidity, noncondensing 
Free Fall/Drop ISO 4180-s, NTSA 1A 
Vibration IEC 68-2-6/34 
Shock/Bump IEC 68-2-27-29 
Electromagenetic Emissions and Susceptibility 
  FCC Part 15, Subpart B, Class A 
  EN 55022 Class A 
  VCCI Class 1 ITE 
  AS/NZS 3548 Class A 
  EN 50082-1 
Safety Agency Approvals 
  UL 1950 (UL listed) 
  CUL C22.2 No. 950 
  IEC 950/EN 60 950 
  CB report 
  NOM-019-SCFI 1994 
Warranty 
  One year 

Ordering Information [ TOP ]  

Table 2:       Ordering Information for the Accelar 1000 Series.
Order Number Description 
Accelar 1200 and 1250 Modular Chassis, CPU and Power Supplies  
DJ1402001 XLR1200 chassis (8-slot) 
DJ1402002 XLR1250 chassis (4-slot) 
DJ1405?01** XLR1298PS power supply (at least one required) 
DJ1405003 XLR1296PS - 48V DC power supply  
DJ1404073 XLR1298SF Silicon Switch Fabric Module1 (at least one required) 
Accelar 1200 and 1250 I/O Modules  
DJ1404054 XLR1202SX-B 2-port 1000BASE-SX Gigabit Ethernet Module 
DJ1404053 XLR1202SR-B 2-port 1000BASE-SX Gigabit Ethernet Module with LinkSafe redundant physical connections 
DJ1404056 XLR1202LX-B 2-port 1000BASE-LX Gigabit Ethernet Module 
DJ1404057 XLR1202LR-B 2-port 1000BASE-LX Gigabit Ethernet Module with LinkSafe redundant physical connections 
DJ1404062 XLR1202XD-B 2-port Long-Distance Gigabit Module, SC single mode fiber connectors 
DJ1404058 XLR1216TX-B 16-port Autosensing 10/100BASE-TX Ethernet Module 
DJ1404059 XLR1208FX-B 8-port 100BASE-FX Ethernet Module  
DJ1404060 XLR1216FX-B 16-port 100BASE-FX Module, MT-RJ connectors 
DJ1404061  XLR1216TF-B 14-port 10/100BASE-TX with RJ-45, 2-port 100BASE-FX with MT-RJ connectors  
DJ1404074 XLR1208FL-B 8-port 10BASE-FL Ethernet Module 
Accelar 1100 and 1150 Base Units 
DJ1402?13** XLR1100-B base unit with sixteen 10/100BASE-TX Ethernet ports and single power supply1  
DJ1402?14** XLR1100R-B base unit with sixteen 10/100BASE-TX Ethernet ports and redundant power1  
DJ1402?15** XLR1150-B base unit with four 1000BASE-SX Gigabit Ethernet ports and single power supply1  
DJ1402?16** XLR1150R-B base unit with four 1000BASE-SX Gigabit Ethernet ports and redundant power supply1  
Accelar 1100 and 1150 I/O Modules 
DJ1404063 XLR1101SX-B 1-port 1000BASE-SX Gigabit Ethernet Module 
DJ1404064 XLR1102SX-B 2-port 1000BASE-SX Gigabit Ethernet Module 
DJ1404065 XLR1102SR-B 2-port 1000BASE-SX Gigabit Ethernet Module with LinkSafe redundant physical connections 
DJ1404066 XLR1101LX-B 1-port 1000BASE-LX Gigabit Ethernet Module 
DJ1404067 XLR1102LX-B 2-port 1000BASE-LX Gigabit Ethernet Module 
DJ1404068 XLR1102LR-B 2-port 1000BASE-LX Gigabit Ethernet Module with LinkSafe redundant physical connections 
DJ1404072 XLR1102XD-B 2-port Long-Distance Gigabit Module, SC single mode fiber connectors 
DJ1404069 XLR1108TX-B 8-port Autosensing 10/100BASE-TX Ethernet Module 
DJ1404070 XLR1104FX-B 4-port 100BASE-FX Ethernet Module  
DJ1404071 XLR1108FX-B 8-port 100BASE-FX module1, with MT-RJ connectors 
Accelar 1050 and 1051 Fixed Configuration Units  
DJ1401?06** XLR1050-B 12-port 10/100BASE-TX with 1-port 1000BASE-SX Gigabit Ethernet 
DJ1401?08** XLR1051-B 12-port 10/100BASE-TX with 1-port 1000BASE-SX Gigabit Ethernet with LinkSafe redundant physical connections  
Accelar 1000 Series Accessories 
DJ0011001 XLR1299PC PCMCIA Flash Memory Module 
** Note: the seventh character (?) of the order number is replaced with the proper code to indicate nationalization: A - No power cord included; B - European schuko power cord common in Austria, Belgium, Finland, France, Germany, The Netherlands, Norway, and Sweden; C - Power cord commonly used in the United Kingdom and Ireland; D - Power cord commonly used in Japan; E - North American power cord; F - Australian power cord, also commonly used in New Zealand and the People's Republic of China. 1Device Manager application software is included in XLR1297SF module, the XLR1100, XLR1100R, XLR1150 and the XLR1150R base units and the XLR1050 and XLR1051 fixed configuration models.