Cisco Wide Area Virtualization Engine 274 Troubleshooting Guide download pdf (Page 28)

REVIEW DRAFT—CISCO CONFIDENTIAL

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Cisco Wide Area Application Services Configuration Guide

OL-26579-01

Chapter 1 Introduction to Cisco WAAS

Overview of the WAAS Interfaces

• Video—Accelerates Windows Media live video broadcasts that use RTSP over TCP. The video

accelerator automatically splits one source video stream from the WAN into multiple streams to

serve multiple clients on the LAN. The video accelerator automatically causes a client requesting a

UDP stream to do a protocol rollover to use TCP (if both the client and server allow TCP).

• Windows Print—Accelerates print traffic between clients and a Windows print server located in the

data center. Signed Server Message Block (SMB) traffic is optimized by transport level

optimizations (TFO, DRE, and LZ). The Windows print accelerator supports Windows 2000,

Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2 print servers. It

supports clients running Windows 2000, Windows XP, Windows Vista, and Windows 7. The

Windows Print accelerator operates only when the CIFS application accelerator is enabled.

Note WAAS Express devices provide application acceleration for CIFS/SMB, HTTP, and SSL traffic.

To enable or disable application accelerators, see the “Enabling and Disabling the Global Optimization

Features” section on page 1-3.

You must enable the accelerator on both of the peer WAEs at either end of a WAN link for all application

accelerators to operate.

File Services for Desktop Applications

The file services (SMB and CIFS accelerators) feature allows a WAE to more quickly fulfill a client’s

requests instead of sending every request over the WAN to the file server. By fulfilling the client’s

requests locally, the WAE minimizes the traffic sent over the WAN and reduces the time it takes branch

office users to access files and many desktop applications, allowing enterprises to consolidate their

important information into data centers.

For more information, see Chapter 1, “Configuring File Services.”

Note Legacy mode WAFS is no longer supported. Legacy WAFS users must migrate to the SMB or CIFS

accelerators.

This section contains the following topics:

• File Services Features, page 1-8

• Role of the Edge WAE, page 1-9

• Role of the Core WAE, page 1-9

File Services Features

File Services include the following features:

• Data coherency and concurrency—Ensures data integrity across the WAAS system by managing the

freshness of the data (coherency) and controlling the access to the data by multiple clients

(concurrency).

• Automatic discovery—Allows you to use file services without having to register individual file

servers in the WAAS Central Manager. With the automatic discovery feature, the WAAS device will

automatically discover and connect to a new file server when a CIFS request is received.

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Cisco Wide Area Virtualization Engine 274 Troubleshooting Guide Page 28