Rtsp Web Cache Redirection - Nortel Web OS Switch Software Application Manual

RTSP Web Cache Redirection

Web OS 10.0 supports Web Cache Redirection (WCR) for Real Time Streaming Protocol
(RTSP). RTSP WCR is similar to HTTP WCR in configuration and in concept. Multimedia
presentations consume a lot of Internet bandwidth. The quality of these presentations depends
upon the real time delivery of the data. To ensure the high quality of multimedia presentations,
several caching servers are needed to cache the multimedia data locally. This data is then made
available quickly from the cache memory as required.
RTSP WCR redirects cached data transparently and balances the load among the cache servers.
If there is no cache server, the request is directed to the origin server. Internet Service Provid-
ers use this feature to cache the multimedia data of a customer site locally. Since the requests
for this data are directed to the local cache, they are served faster.
You can also configure certain URL content to be non-cacheable. The requests for non-
cacheable URLs will bypass the cache server and be sent across the Internet to the origin
server. The client packets are relayed to the server by using Layer 4 server load balancing.
For a detailed information on load balancing two prominent commercial RTSP servers—Real
Player and QuickTime—see
RTSP Web Cache Redirection Example
To configure RTSP for web cache redirection, follow this procedure:
1. Define RTSP WCR cache servers for RTSP WCR load balancing.
>> # /cfg/slb/real 1
>> Real server 1# rip 1.1.1.1
>> # /cfg/slb/real 2
>> Real server 2# rip 1.1.1.2
2. Define RTSP cache server groups for RTSP WCR load balancing.
>> # /cfg/slb/group 1
>> Group 1# add 1
>> Group 1# add 2
212777-A, February 2002
"Real Time Streaming Protocol SLB" on page
Chapter 8: Application Redirection
Web OS 10.0 Application Guide
155.
(Enter an IP address, for example:
1.1.1.1 for RTSP cache Server 1)
(Enter an IP address, for example:
1.1.1.2 for RTSP cache Server 2)
(Add RTSP cache server 1 to group 1)
(Add RTSP cache server 2 to group 1)
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