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Alteon Application Switch Operating System Application Guide
Load Balancing Special Services
Document ID: RDWR-ALOS-V2900_AG1302
295
9. Apply and save your configuration.
Clients retrieving files of type RTSP://Globalnews.com/headlines.ram use virtual IP address
30.30.30.100 of the RealNetworks server group, and clients retrieving files of type RTSP://
Globalnews.com/headlines.mov use virtual IP address 40.40.40.100 of the QuickTime server
group.
Content-Intelligent RTSP Load Balancing
Alteon supports RTSP load balancing based on URL hash metric or string matching to load balance
media servers that contain multimedia presentations. Because multimedia presentations consume a
large amount of Internet bandwidth, and their correct presentation depends upon the real time
delivery of the data over the Internet, several media servers contain the same multimedia data.
For more conceptual information on RTSP, see
Real Time Streaming Protocol SLB, page 291 .
Figure 45 - RTSP Load Balancing, page 296 shows two groups of media servers: Group 1 is
configured for URL hashing, and Group 2 is configured for string matching. The media servers are
cache servers configured in reverse proxy mode.
URL Hash
Use the URL hash metric to maximize client requests to hash to the same media server. The original
servers push the content to the cache servers ahead of time. For example, an ISP is hosting audio-
video files for GlobalNews on media servers 1, 2, 3, and 4. The domain name GlobalNews.com
associated with the virtual IP address 120.10.10.10 is configured for URL hash.
The first request for http://Globalnews.com/saleswebcast.rm hashes to media server 1. Subsequent
requests for http://Globalnews.com/saleswebcast.rm from other clients or from client 1 hashes to
the same Server 1. Similarly, another request for http://Globalnews.com/marketingwebcast.rm may
hash to media Server 2, provided saleswebcast and marketingwebcast media files are located in the
origin servers.
Typically, a set of related files (audio, video, and text) of a presentation are usually placed under the
same directory (called a container directory). Alteon URL hashing ensures that the entire container
is cached in a single cache by using the entire URL to compute the hash value and omitting the
extension (for example, .ram, .rm, .smil) occurring at the end of the URL.
String Matching
Use the string matching option to populate the RTSP servers with content-specific information. For
example, you have clients accessing audio-video files on Radware1 and clients accessing audio-
video files on Globalnews2. You can host the Globalnews1 media files on media Servers 5 and 6, and
host Globalnews2 media files on media Servers 7 and 8.
>>SLB port 4# server ena
(Enable server processing)
>>SLB port 4# /cfg/slb/port 13
(Select the server port)
>>SLB port 13# server ena
(Enable server processing)
>>SLB port 13# /cfg/slb/port 14
(Select the server port)
>>SLB port 14# server ena
(Enable server processing)
>>SLB port 14# /cfg/slb/port 15
(Select the server port)
>>SLB port 15# server ena
(Enable server processing)
>> SLB port 15# apply
>> SLB port 15# save