Streaming Media Supplement sa2150 and sa2250

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Chapter 6 Configuring Media-IXT: an Overview
Selective caching and the cache.config and filter.config files
Using selective caching, you can specify criteria to determine whether content is proxyable or not, and
cacheable or not.
When content is not proxyable, Media-IXT denies the client connection, with an appropriate message to the
client (if possible).
When content is not cacheable, Media-IXT goes into passthrough mode and proxies, but does not cache, the
content.
See the HP Cache Server Appliance Administrator Guide for more information about selective caching.
Two configuration files control selective caching:
• cache.config controls cacheability
• filter.config controls proxyability
You must edit cache.config and filter.config manually, adding selective caching rules to the files.
You can, optionally, add an RNI or QT tag to any selective caching rule.
This permits you to apply one rule to QuickTime content and another for RealNetworks content.
The format for the tag is to add tag= to the end of the rule, followed by the tag value of RNI or QT.
The kinds of selective caching rules you can write for RealNetworks and QuickTime differ from those you can
write for WMT. See “Configuring selective caching for RealNetworks” on page 71, “Configuring selective
caching for WMT” on page 88 and “Configuring selective caching for QuickTime” on page 97.
Configuration file summary tables
The tables below summarize which configuration files go with which feature, how they are edited, and how they
look in examples.
Feature Configuration file Tags Tag format
Configurable
from Traffic
Manager
Reverse proxy caching remap.config RNI, QT <space><tag> yes
Hierarchy parent.config
on child Media-IXT
RNI, QT tag=<tag> no
Selective caching: cacheability cache.config RNI, QT tag=<tag> no
Selective caching: proxyability filter.config RNI, QT tag=<tag> no
Feature Configuration file Example entries
Reverse
proxy
caching
remap.config map rtsp://Media-IXT.com rtsp://origin_svr_a.com RNI
map rtsp://Media-IXT.com rtsp://origin_svr_b.com QT
Hierarchy parent.config on
child Media-IXT
dest_domain=. parent=parent1:8080 tag=RNI
dest_host=here scheme=rtsp
parent="host.there.com:1091" go_direct=true tag=QT
Selective
caching:
cache-ability
cache.config
dest_domain=. scheme=rtsp action=never-cache tag=RNI
Selective
caching:
proxy-ability
filter.config dest_domain=. scheme=rtsp action=allow tag=QT