Cisco Cisco ASR 1000 Series 40Gbps SPA Interface Processor Libro blanco

 

 

White Paper 

© 2015 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. 

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global scaling, low cost of overhead and maintenance, and immediate access to the most up-to-date features and 

capabilities. 

A tradeoff to these benefits is that enterprise WAN bandwidth requirements are increased, especially in a large 

campus environment with wide-scale adoption of web conferencing. While the WAN bandwidth expense is 

outweighed by the IT department savings of SaaS, reducing those demands can lead to significant enhancements in 

web conferencing performance and allow that bandwidth to be used for other mission-critical business applications. 

A hybrid solution of WebEx hosted web conferencing with a premises-based solution promises to delver the best of 

both worlds of on demand and on premises and to reduce WAN bandwidth costs and firewall load. 

The Cisco WebEx Node for the ASR 1000 Series is designed to be such a hybrid solution. Technology details are 

explained below. 

As web conferencing has become a standard business communication means such as with instant messaging and 

phone conferencing, it inevitably means that many meetings will occur behind the corporate firewall. With a pure on-

demand web conferencing service, these internal meetings will create sessions that traverse the firewall and add to 

WAN bandwidth requirements. A hybrid solution will eliminate the need for many of these meeting streams to cross 

the WAN and firewall boundary, but how much?  

A good rule of thumb for very large enterprises is that 75% of meetings are internal while 25% are external. This 

indicates that many WebEx customers would benefit from the WebEx Node for the ASR 1000. However, each 

customer should assess their own WebEx meeting traffic patterns. In some cases, such as when WebEx is used 

heavily for training or  events, meeting traffic can be biased toward external usage. 

Table 1 shows a hypothetical business case comparing a pure on-demand solution to a hybrid solution using the 

WebEx Node for the ASR 1000 Series. The business case assumes that the enterprise is using meeting, voice, and 

video capabilities of WebEx. 

The business case assumes that a large enterprise with a significant campus location has about 2500 peak 

attendees with 75 percent of those attendees internal to the campus and behind the firewall. The ratio of external to 

internal attendees was determined by a Cisco WebEx analysis of meeting traffic.