Specifications
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Cisco TV CDS 2.5 ISA Software Configuration Guide
OL-24788-01
Chapter 4 Configuring the CDS
Server Level Configuration
• Control DSCP
• Data DSCP
• Stream DSCP
Differentiated Services Code Point (DSCP) uses six bits of the DiffServ field, which was originally the
ToS octet, to mark all outgoing packets with a specific DSCP value. Control, data, or stream traffic may
require certain forwarding behavior, known as the per-hop behavior (PHB), which is specified in the
DSCP. The network gives priority to marked traffic. Generally, the lower number has lower priority and
the higher number has higher priority. The valid entries are 0 to 63.
DSCP is set separately for control, data, and stream traffic.
Custom
The Custom DSCP Marking Method option allows you to set the DSCP for each of the following types
of traffic:
• Control Traffic
• Stream Traffic
• Highest Priority Retransmit Traffic
• Committed Rate Lost Packet Recovery
• Committed Rate Traffic
• Mirroring Lost Packet Recovery (Vault only)
• Mirroring Live Ingest Traffic
• Drive Failure Repair Traffic (Vault only)
• Mirroring Traffic (Vault only)
• Lowest Priority Data Smoothing Traffic (Vault only)
AF Class
There needs to be a dedicated Differentiated Services (DiffServ) Assured Forwarding (AF) class for the
CCP traffic. The Assured Forwarding PHB guarantees a certain amount of bandwidth to an AF class and
allows access to extra bandwidth, if available. There are four AF classes, AF1x through AF4x. Within
each class, there are three drop probabilities (low, medium, and high).
DSCP can also be set for HTTP Streamers when HTTP is selected as the cache-fill protocol for VVI on
the CDSM Setup page.
Note The sum of all bandwidths configured for CCP traffic cannot exceed the bandwidth configured for the
AF classes reserved for CCP. CCP is used as the protocol among Vaults and Caching Nodes in a VVI
that uses HTTP, and among all servers in a VVI that uses CCP and in all non-VVIs.
Table 4-40 lists the four AF classes and the data types for each drop probability. To set the AF class on
each server, use the DSCP Marking Method drop-down list in the Server Setup page.