Cisco Versatile Interface Processor 4, Model 50 VIP4-50= 数据表

Cisco Systems, Inc.

All contents are Copyright © 1992–2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.

Page 2 of 5

The VIP4 also supports the following features:

• High performance—The VIP4 (Model 80) provides the highest distributed switching services available, delivering

over twice the switching performance of earlier-generation VIPs. On average, the VIP4-80 provides between 150

and 210 kpps of switching throughput in each direction for most port adapters. This new benchmark for

high-performance switching is well suited for multiple high-speed connections such as quad DS3, dual OC-3, and

OC-12. Coupled with its high-performance RISC-based processor and Cisco developed system controller ASIC,

the VIP4 ensures high throughput, even while applying the broad set of intelligent Layer 3 through Layer 7

services available with the Cisco 7500 series router.

• High bandwidth—The VIP4 modules deliver nearly double the PA bandwidth when compared to the earlier VIP2

series. Each VIP4 provides a total aggregate of 750+ MB of bandwidth to its two PAs. Additionally, the new

advanced architecture of the VIP4 ensures available bandwidth is allocated based on traffic requirements

both between the two port adapters as well as in the direction of traffic flow.

• Increased availability—ECC is a standard VIP4 feature. The VIP4 uses (SECDED), which detects and corrects

single-event upsets within a data word. This enables continued system availability in the presence of a single-event

parity upset.

• Mixed media—The modular VIP4 design enables the selection of more than 50 LAN and WAN PA types for

customization to any networking environment. With two PA bays, the VIP4 enables mixing different media types

(Ethernet and serial, for example) on a single VIP4, maximizing chassis slot utilization. The VIP4 is fully

compatible with most Cisco 7500/7200 PAs.

• Packet memory—Each VIP4 contains 64 MB of high-speed packet memory for buffering packets and advanced

quality-of-service (QoS) packet queues, thus distributing and greatly increasing the amount of packet memory

available in the system. This feature is particularly important in environments with large round-trip propagation

delays, bursty traffic conditions, or where extensive use of advanced queueing systems (such as the Cisco

Distributed Weighted Random Early Detection (D-WRED), Weighted Fair Queuing (WFQ), and Class-Based

Queuing) is being utilized.

• Distributed switching—An advanced software feature, distributed switching (DSW) provides the scalable,

multilayer switching function that enables the aggregate performance of the Cisco 7513 to scale to over two

million packets per second. A unique property of VIP-equipped Cisco 7500 systems provides incremental system

switching capacity with the insertion of every VIP module. In the case of the VIP4, between 150 and 210 kpps

(300–420-kpps aggregate) of switching capacity is added with each VIP4-80 model introduced into existing Cisco

7500 series routers. The Distributed Switching services available on VIP4 include:

– Distributed Cisco Express Forwarding (CEF)—Route table information and changes are proactively

distributed to CEF-enabled VIP4s. VIPs never need to query the RSP for route information on new packet

destinations, improving overall performance in networks whose topologies are dynamic and in constant

change or are characterized by short-lived packet flows—such as the Internet. Distributed CEF effectively

separates the control function (the RSP) from the data function (IP packet switching within and among VIPs),

improving system-wide performance of all services provided.

– Distributed optimum/fast switching—Each VIP4 provides incremental packet processing engines for optimum

and fast-switching methods—improving overall system IP switching performance.