Specifications

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Cisco TV CDS 2.5 ISA Software Configuration Guide
OL-24788-01
Chapter 2 Network Design
Network Connections
Management Interface
The management interface communicates with the network management system (NMS) by way of
SNMP, the BMS by way of ISA commands and also RTSP, and with all Vaults, Caching Nodes, and
Streamers in the same array. Information shared among servers in the same array includes the following:
• Host service information
• Domain Name System (DNS) service information
• QAM gateway information
• All ISA information
Management traffic is low volume; however, when using Layer 2 packet forwarding, we recommend
using a port-based VLAN to ensure delivery of critical management communications.
Cache Interfaces
The CCP uses the cache interfaces on the Vaults, Caching Nodes, and Streamers to send the following
data to the servers in the same array:
• Content sent to the Streamers
• Content mirrored among the Vaults
• Messages containing information used for performance optimization exchanged among all the CDS
servers
Note All Cisco CDS servers are connected through a switch fabric. Because all Vaults, Caching Nodes, and
Streamers in the same array exchange heartbeat messages through the cache interfaces, it is important to
ensure there is enough bandwidth among switches involved in delivering cache traffic and to support the
same aggregated amount of traffic on all cache interfaces.
When using Layer 2 packet forwarding for cache traffic, we recommend the use of a port-based VLAN.
Cache/Stream Interfaces
The cache/stream interfaces on the Streamer server can be used for both cache and streaming traffic. The
number of interfaces designated for each traffic type is configurable. If an interface is configured for
both cache and streaming traffic, priority is given to the higher-bandwidth stream traffic provided cache
traffic is able to transmit on other interfaces.
When using Layer 2 packet forwarding for cache and stream traffic, we recommend the use of a
port-based VLAN.
Streaming Interface
The streaming interface delivers streaming traffic consisting of MPEG-2 transport streams to STBs by
way of QAM devices.
If an interface is configured for both stream and cache traffic, and the jumbo frames feature is not
enabled for stream traffic while jumbo frames is enabled for cache traffic, stream traffic uses 1500-byte
packets while cache traffic uses jumbo frames.