Specifications

4-89
Cisco Internet Streamer CDS 2.0-2.3 Software Configuration Guide
OL-13493-04
Chapter 4 Configuring Devices
Configuring the Service Router
Table 4-47 Service Router Routing Settings Fields
Field Description
Least Loaded
Routing
Note This is a Release 2.0 and Release 2.1 feature. In Release 2.2 and Release
2.3, Least Loaded Routing is enabled by default.
When enabled, the SR redirects the client request to the SE that reports the lowest
average load, given that each SE in the routing table has the same metric value
(weight). When a configured threshold for an SE is exceeded, the SR compares the
SE assigned weight and current load to the configured threshold values when
making routing decisions. The metric value is configured in the Coverage Zone
file. For more information about the SR routing methods, see the “Routing
Methods” section on page 1-22.
Last-resort routing is applicable when load-based routing (least loaded) is enabled
and all Service Engines have exceeded their thresholds or all Service Engines in
the domain are offline. The Service Router can redirect requests to a configurable
alternate domain when all Service Engines serving a client network region are
overloaded.
Note If the last-resort domain is not configured and the Service Engine
thresholds are exceeded, requests are redirected to the origin server.
To configure last-resort routing, see the “General Settings—Last Resort” section
on page 4-91 for Release 2.1, or see the “Configuring Last-Resort Routing” section
on page E-6 for Release 2.0.
Location Based
Routing
In Release 2.0 and Release 2.1, location-based routing is designed to work with
least-loaded routing. When both are enabled, the Service Router first looks up the
client’s IP address in the Coverage Zone file. Then, if there is no subnet match, the
client’s geographical location is compared to the geographical location of the
Service Engines listed in the Coverage Zone file, and the closest and least-loaded
Service Engine is selected. Geographically locating a client is used when users
roam outside of their home networks.
Primary
Geo-Location
Server IP Address
and Port
The IP address and port number of the primary Geo-Location Server for
location-based routing. For more information, see the “Routing Methods” section
on page 1-22.
Secondary
Geo-Location
Server IP Address
and Port
The IP address and port number of the secondary Geo-Location Server for
location-based routing. For more information, see the “Routing Methods” section
on page 1-22.
Enable Content
Based Routing
When enabled, the SR redirects requests based on the URI. Requests for the same
URI are redirected to the same SE, provided the SE’s thresholds have not been
exceeded. This optimizes disk usage in the CDS by storing only one copy of the
content on one SE, instead of multiple copies on several SEs. For more information
about content-based routing, see the “Content-Based Routing” section on
page 1-24.
Number of
Redundant Copies
Number of copies of a content to keep among SEs in a delivery service. The range
is from 1 to 4. The default is 1. If redundancy is configured with more than one
copy, multiple Service Engines are picked for a request with the same URI hash.