CHAPTER 2 Media Flow Manager Overview
Media Flow Manager Administrator’s Guide
30
Admission Control
Copyright © 2010, Juniper Networks, Inc.
or pre-created according to a given format, or even with a proprietary format as long as the
client will understand the response.
Admission Control
Admission Control works with Service Director. Media Flow Manager runs the Service Director
mechanism to control the edge servers that serve client requests for content, based on the
geographical location of the client. Service Director allows you to configure the closest Media
Flow Controller for a given geographical location. Admission Control leverages the interface
statistics from the Media Flow Controllers and controls the outgoing bandwidth for the content
served by the Media Flow Controllers using the Service Director.
Media Flow Controllers are designed to track the interface stats (RX bytes and TX bytes) on
every network interface. In a typical setup, the TX bytes would be the content delivered by the
Media Flow Controller while the RX bytes would the data fetched from the origin server. The
Media Flow Manager Admission Control feature fetches the interface stats from the Media
Flow Controllers at regular intervals (5 minutes). These RX and TX stats from the various
Media Flow Controllers are then collated to calculate the delivered bandwidth and the received
bandwidth. These collated bandwidths are recorded and plotted on a graph for easy viewing in
the Media Flow Manager. The Service Director uses the configuration of location-to-host
mapping to return an XML with the host name of the edge Media Flow Controller based on the
client’s location. To assist with Admission Control, configure a
high watermark bandwidth
and low
watermark bandwidth
used by the Service Director in the following way:
•
If the current bandwidth measured in the last 5 minutes goes above the set
high
bandwidth watermark
, the Service Director only returns the default configured host
(typically the CDN). This would mean that no new traffic comes to the Media Flow
Controllers while they serve all the current requests.
•
If the current bandwidth drops below the set
low bandwidth watermark
, the Service
Director goes back to normal operation returning hosts based on the set configuration.
This lets you throttle the aggregate bandwidth delivered by the Media Flow Controllers,
ensuring that the publisher does not pay bandwidth overage charges.
Real-Time Log File Analyzer
Juniper Networks Media Flow Manager also provides an interface to AWStats™ realtime
logfile analyzer to provide aggregated log information output to the
Reports
page. A full log
analysis enables AWStats to show you the following information:
•
Number of visits, and number of unique visitors
•
Visits duration and last visits
•
Authenticated users, and last authenticated visits
•
Days of week and rush hours (pages, hits, KB for each hour and day of week)
•
Domains/countries of hosts visitors (pages, hits, KB, 269 domains/countries detected,
GeoIp detection)
•
Hosts list, last visits and unresolved IP addresses list
•
Most viewed, entry and exit pages
