Cisco Cisco Network Capacity Expansion 数据表
Data Sheet
© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
Page 2 of 6
The NCE Advantage
Designed to meet the needs of small and midsize remote sites, NCE focuses on three primary
areas:
Throughput
Bandwidth specifies the maximum data transfer rate achievable on a WAN link. Latency,
congestion, and packet loss determine the actual transfer rate (throughput). Cisco NCE uses two
techniques to take throughput past the bandwidth limit: virtual bandwidth expansion and improved
bandwidth utilization. Compression and packet-bundling algorithms increase effective bandwidth.
Packet flow control and TCP optimization mitigate effects of congestion and latency to improve
utilization of available bandwidth. The combined effect of these technologies results in a dramatic
expansion of available WAN link capacity and enables extremely fast data transfer rates over
the WAN.
Integration
Cisco NCE is a hardware extension of Cisco IOS Software and therefore tightly integrated into the
network fabric. Such a close integration helps ensure that bandwidth optimizations and routing
decisions are happening simultaneously without the added overhead of another interception. The
tight integration has the added benefit of minimal configuration and once deployed requires no
monitoring. Moreover, NCE is directly integrated into the Cisco Express Forwarding switching path,
helping ensure complete transparency to other network services and all security provisions.
Finally, NCE has been built ground up for ISRs and leverages the internal ISR hardware
architecture.
Cost-Effectiveness
Cisco NCE performs no application-specific traffic optimization and is not classified as a WAN
optimization controller (WOC). Cisco Wide Area Application Services (WAAS) fall into this product
category, providing additional benefits. However, by focusing on the root causes of poor WAN
throughput—limited bandwidth and network latency, eliminating complexities associated with
vendor-specific application optimizations, and keeping costs low—NCE offers unbeatable price for
performance, simplicity, and transparency. Designed to meet the needs of small and medium-
sized remote sites, NCE is easy to use and maintain and uses the ISR for a low total cost of
ownership.
Product Description
Cisco NCE acts as a transparent PEP (Figure 2) that terminates sender’s TCP session locally,
compresses and bundles the sender’s data, sends the data to a remote peer encapsulated in a
Stream Control Transmission Protocol (SCTP), unbundles and decompresses the data, and
establishes a new TCP session remotely to deliver the data to its destination.
For remote and mobile sites, NCE is available in the Advanced Integration Module (AIM) form
factor that is supported on all the modular ISRs, including the Cisco 1841, 2801, 2811, 2821,
2851, 3825, and 3845 Integrated Services Routers. There are two AIM configurations differing by
the amount of outbound bandwidth supported.
Figure 2. Network Capacity Expansion System PEP Architecture