The Cisco HyperSwitch Model A100 ATM Switch, targeted for use in
building ATM campus backbone networks, is the industry's first switch to
provide full, integrated support for ATM Forum User-Network Interface (UNI)
V3.0 signaling. The Cisco HyperSwitch Model A100 is the first of a planned
family of Cisco HyperSwitch products that will address the range of ATM
switching applications, from the workgroup through WAN access and enterprise
Combined with the Cisco ATM Interface Processor (AIP), the 16-port
Cisco HyperSwitch operates seamlessly with the Cisco 7000 family of high-end
multiprotocol routers, enabling organizations to evolve their shared-media LAN
internetworks into switched internetworks. The high bandwidth and scalability
advantages of these switched, ATM-based internetworks provide users with a
robust architecture capable of accommodating the emerging wave of complex,
high-bandwidth network applications.
The Cisco HyperSwitch represents a key element of the CiscoFusion
architecture, Cisco's comprehensive strategy for helping today's LAN
internetworks to evolve into the switched internetworks of tomorrow. The Cisco
HyperSwitch was jointly developed by Cisco Systems and Nippon Electric
Corporation (NEC), building on the combination of NEC's years of experience
with ATM switching systems and Cisco's expertise in internetworking
Cisco has ported onto the Cisco HyperSwitch portions of
IOS® Software. Cisco IOS Software offers a unique set of internetworking
software capabilities that enable information-intensive companies to build
scalable, high-performance enterprise networks that can incorporate the growing
multitude of network protocols, platforms, and technologies. The first portion
of Cisco IOS Software to be ported onto the Cisco HyperSwitch is the ATM
signaling code, which also runs on the Cisco AIP, ensuring interoperability
between the two devices. In the future, Cisco plans to integrate increasingly
sophisticated ATM networking capabilities into Cisco IOS Software.
Supports up to 16 155-Mbps ATM interfaces.
Uses modular architecture to achieve flexibility and low entry
Provides nonblocking, 2.4-Gbps output buffer type switch fabric
with a minimum of 1000 virtual output cell buffers per port.
Supports all ATM adaptation layers (ATM adaptation Layer 1 [AAL1]
through ATM adaptation Layer 5 [AAL5]) and traffic types.
Provides two priority levels for both cell loss and for cell
Supports multicast traffic with no throughput degradation.
Cisco HyperSwitch Features. The Cisco
HyperSwitch supports any combination of from one to 16 ATM interface cards. The
Cisco HyperSwitch uses a combination of input and output buffers connected by a
nonblocking switch fabric, which offers full throughput multicast and broadcast
There are no specific requirements for this document.
This document is not restricted to specific software and hardware
For more information on document conventions, refer to the
Technical Tips Conventions.
ATM networks offer a number of significant advantages, including
scalable bandwidth, virtual networking, and integrated traffic support. ATM
technology's connection-oriented, self-routing communications help facilitate
high switch throughputs, helping to minimize network delays. High-speed ATM
networks will be required to meet the increasing bandwidth requirements of such
complex applications as image processing, video conferencing, and switched
Switched internetworks based on ATM technology represent a paradigm
shift away from shared-media LANs in campus and enterprise networking
applications. The foundation of the switched internetwork is an ATM backbone,
which interconnects multilayer LAN switches. These multilayer
switches—switching packets at Layer 2 (L2) or Layer 3 (L3), as described in the
CiscoFusion architecture—will support virtual LAN protocols across the ATM
backbone, providing enterprise networks with much greater flexibility and
broader management capabilities than shared-media LANs. In addition, ATM's
potential to handle all types of traffic, including voice, video, and data,
provides ATM backbones with significant advantages compared with backbones
based on other technologies.
ATM Building or Campus Backbone. Switched
internetworks based on ATM technology represent a paradigm shift away from
shared-media LANs in campus and enterprise networking applications. The Cisco
HyperSwitch is designed for constructing ATM campus backbone networks that
connect a number of ATM routers, multilayer switches, and high-performance
servers into a router cluster.
The Cisco HyperSwitch is designed primarily for constructing ATM campus
backbone networks that connect a number of ATM routers, multilayer switches,
and high-performance servers into a router cluster. ATM routers—such as the
Cisco 7000 with the Cisco AIP module—allow existing LANs to be interconnected
across ATM backbones while paving the way for new applications such as virtual
LAN internetworking. The AIP for the Cisco 7000 family of multiprotocol routers
is the first of a set of native ATM interfaces that will support the full range
of Cisco routers.
A router cluster can scale to many gigabits of bandwidth and millions
of packets per second, enabling customers to alleviate the congestion on their
current backbone networks by migrating from their existing backbone
technologies. While the AIP module provides for transparent internetworking of
current LAN and WAN protocols across the ATM backbone, high-speed servers can
also be directly connected to the Cisco HyperSwitch, linking with desktop
clients on multilayer switches through virtual LAN protocols.
As network backbones increase in size, multiple switches can be
interconnected to increase the scale and port density of the backbone. ATM
routing protocols, such as the Private Network-to-Node Interface (P-NNI)
protocol currently being developed by the ATM Forum, will be used to facilitate
the construction of these large-scale ATM backbone networks.
Reliable backup network configurations are possible with the Cisco
HyperSwitch through the use of redundant connections. Cisco ATM routers also
can support dual-homed connections and route around failed links, thus
providing the same level of reliability on ATM backbones that can be achieved
today using router backbones.
Multiple-Switch Backbone Network. By
interconnecting multiple Cisco HyperSwitches, network backbone scale and port
density can be increased. ATM routing protocols, such as the P-NNI protocol,
will be used to build large-scale ATM backbone networks.
The Cisco HyperSwitch supports up to 16 ATM ports and features a total
nonblocking throughput of 2.4 Gbps. Each port is able to operate at rates of up
to 155 Mbps. The Cisco HyperSwitch uses a combination of input and output
buffers connected by a nonblocking switch fabric. Multicast and broadcast
support are built into the fabric and can be implemented without any reduction
in throughput. In addition, the Cisco HyperSwitch's integrated support for ATM
signaling precludes the need for an external signaling server.
The Cisco HyperSwitch supports any combination of from 1 to 16 ATM
interface cards, enabling users to easily and economically deploy the precise
number of interfaces and interface types that they require. Interface cards can
be added and changed in the field, offering additional versatility to
organizations with large, geographically dispersed internetworks.
The Cisco HyperSwitch supports a wide range of LAN and WAN ATM
interfaces. All interfaces conform to the relevant standards, including those
of the ATM Forum, European Telecommunication Standards Institute (ETSI),
T1S1.5, and the International Telecommunication Union Telecommunication
Standardization Sector (ITU-T).
Because the Cisco HyperSwitch has been designed for backbone
deployment, it will be able to support such WAN interfaces as DS3/E3 and
single-mode fiber SONET/Synchronous Digital Hierarchy (SDH). This capability
will allow seamless connectivity between ATM campus backbones and ATM public
and private WANs. In addition, the Cisco HyperSwitch can be used in workgroups
to support power users with direct ATM desktop interfaces. In order to
facilitate such deployment, the Cisco HyperSwitch will support the emerging ATM
Forum copper (unshielded twisted pair Category 5 [UTP-5]) interfaces.
Complies fully with ATM Forum, ITU-T, and ETSI specifications.
Can be used as either a backbone, workgroup, or WAN access switch.
SONET/SDH Synchronous transport signal Level 3, concatenated
(STS3c)/Synchronous Transport Module level 1 (STM1) 155-Mbps multimode fiber.
Transparent Asynchronous Transmitter/Receiver Interface (TAXI)
100-Mbps multimode fiber.
SONET/SDH STS3c/STM1 155-Mbps single-mode fiber.
DS3 over coaxial cable.
E3 over coaxial cable.
STS3c/STM1 over UTP-5.
STS-1 (55 Mbps) over unshielded twisted pair Category 3 cable
PHYSICAL LAYER DATA RATE MODE CONNECTOR
STS3c/STM1 155 Mbps Multimode fiber SC
TAXI 4B/5B 100 Mbps Multimode fiber MIC (FDDI style)
STS3c/STM1 155 Mbps Single-mode fiber SC
STS3c/STM1 155 Mbps UTP-5 RJ-45
DS3 45 Mbps Coaxial cable BNC
E3 34 Mbps Coaxial cable BNC
Broad Interface Support. The Cisco
HyperSwitch supports a wide range of LAN and WAN interfaces. The switch will
support such WAN interfaces as DS3/E3 and single-mode fiber SONET/SDH,
providing connectivity between campus backbones and public and private WANs.
The Cisco HyperSwitch is configured through a local management console
connected through a serial port. Simple Network Management Protocol (SNMP)
and Telnet access across the ATM ports is also possible for remote monitoring
and configuration of switch parameters. Front-panel LEDs allow for rapid
diagnosis of line alarms and faults. Future software enhancements will allow
for SNMP configuration and full monitoring of traffic flows through the switch,
while switch management will be integrated into the
network management system.
The Cisco HyperSwitch supports virtual channel connections (VCCs) and
virtual path connections (VPCs). Both types of connections can also be
configured as either point-to-point or point-to-multipoint. Each port supports
a maximum of 4096 point-to-point connections, while the switch itself can
support up to 1024 point-to-multipoint connections. The full eight bits (for
UNI cells) or 12 bits (for Network-to-Network Interface [NNI] cells) of the
virtual path identifier (VPI) field are supported for VPC.
Each connection through the Cisco HyperSwitch can be labeled as either
high priority (requiring low cell delay variation) or low priority (tolerant of
cell delay variation). High-priority connections will typically be used for
voice or video traffic, while low-priority connections will usually handle data
traffic. Connections can be either permanent virtual connections (PVCs) or
switched virtual connections (SVCs). PVCs are set up through the serial port,
with parameters stored in nonvolatile memory for retention following a power
failure or reset. By comparison, SVCs are set up by ATM end stations using ATM
signaling protocols to communicate with the switch.
Supports both permanent and switched virtual
Supports virtual channel (VC), virtual path (VP), point-to-point,
and point-to-multipoint connections.
Eliminates single points of failure through fully integrated
support for ATM Forum V3.0 Q.2931 UNI signaling.
Supports up to 4096 ATM point-to-point connections per interface
and 1024 point-to-multipoint connections per switch.
Allows construction of multiswitch networks via NNI standard
Allows downloading of new software images using Flash EPROM
Provides configuration and PVC setup through a local management
Enables remote monitoring across ATM interfaces using SNMP.
Supports SNMP configuration and ATM management standards.
Fits into any standard 19-inch equipment rack using either
tabletop or rack mounting.
The Cisco HyperSwitch supports signaling protocols that conform to the
ATM Forum UNI version 3.0 specification. Future releases will support the
pending ATM Forum UNI version 3.1 signaling protocol based on ITU-T
recommendations Q.2931 and Q.2110. The signaling will support point-to-point
connection setup using any of the address formats defined by the ATM Forum,
including E.164 or network service access point (NSAP)-encoded ATM private
network addresses. A built-in segmentation and reassembly (SAR) function in the
switch allows it to support ATM signaling and network management functions.
Either AAL5 or AAL (layer 3/4) 3/4 can be used for carrying signaling
In addition to supporting UNI signaling, the Cisco HyperSwitch supports
NNI functionality, enabling signaling requests to be routed in a multiswitch
network. In the first release, the switch will support a prefix-based static
routing protocol. As the P-NNI standards are developed, the Cisco IOS Software
will be enhanced to support them. Because of built-in signaling support, the
switch does not require a separate connection management system—thus lowering
system costs and enhancing overall reliability.
Redundant Network Design. Redundant
connections enable the Cisco HyperSwitch to provide reliable network
configurations. Cisco ATM routers also can support dual-homed connections and
route around failed links—providing the same level of reliability currently
offered by today's conventional router backbones.
The Cisco HyperSwitch supports two levels of priority for both cell
loss and cell delay variation (called jitter). Each connection can be marked as
either high or low priority with respect to cell delay variation. The switch
fabric maintains separate logical queues for each priority class and guarantees
that high-priority queues will be served first, thus reducing cell delay
variation due to buffering delays. This capability is ideal for time-sensitive
traffic such as voice or video.
Cell loss priority is controlled by the Cell Loss Priority (CLP) bit in
the cell header. Once cell buffers fill beyond a set threshold, cells with the
CLP bit set will be discarded. The switch supports a minimum of 1000 cells of
virtual output buffering per port, ensuring low loss rates for highly bursty or
"best effort"-type LAN traffic. Interface cards also implement traffic policing
to monitor the peak transmission rates of connections. Once a set peak rate is
exceeded, the interface discards excess cells, precluding specific connections
from monopolizing the switch's bandwidth. Because of these mechanisms, the
delay through the switch is constrained to between 20 microseconds and 5
milliseconds, depending upon traffic flows. Higher-priority cells will
experience a shorter latency and jitter than lower-priority cells.
All of the world's largest multiprotocol data networks have been built
with Cisco routers. The experience that Cisco has gained helping to construct
these global internetworks has delivered real competitive benefits to customers
across all industry segments. Strategic global partnerships with other industry
leaders and the industry's most comprehensive internetwork support
infrastructure complete the Cisco advantage.
As an active member of the ATM Forum—and the first company to introduce
ATM routing and switching products that conform to Forum specifications for
connection setup—Cisco has been one of the key companies responsible for
developing and advancing the state of ATM technology. Cisco HyperSwitch and
Cisco AIP module, linked by Cisco IOS Software to provide a seamless and
scalable enterprise network, enable Cisco to offer the industry's most
comprehensive evolution path to switched internetworks. Using the common
software infrastructure of the Cisco IOS Software, customers can build networks
using virtually any technology—from LAN concentration and multiprotocol routing
to LAN and ATM switching. Cisco's technology protects existing network
equipment investments while providing a smooth migration path and scalable
connectivity to accommodate future internetworking needs.
Width: 17.1 in (435 mm)
Depth: 16.9 in (430 mm)
Height: 6.3 in (160 mm)
Weight: 33.1 lbs (15 kg)