Configuring Headend Broadband Access Router Features
Security Features
MC-528
Cisco IOS Multiservice Applications Configuration Guide
Weighted Random Early Detection
Weighted Random Early Detection (WRED) enables you to specify traffic handling policies to maximize
throughput under congestion conditions. Random early detection (RED) works in conjunction with TCP
to intelligently avoid network congestion. WRED combines IP precedence and RED capabilities to
provide differentiated performance characteristics for different classes of service, thus providing
preferential traffic handling for higher priority traffic. You can define minimum and maximum queue
depth thresholds and drop probabilities for each class of service.
For more information on this feature, refer to the Cisco IOS Quality of Service Solutions Configuration
Guide.
Weighted Fair Queueing
Weighted Fair Queueing (WFQ) performs priority output queueing and custom queueing to grant
resources to important sessions when network bandwidth is saturated; it is typically used for digitized
voice packets to help reduce delay. WFQ provides expeditious handling for high priority traffic,
requiring low delay, while fairly sharing the remaining bandwidth between lower priority traffic. WFQ
divides link traffic into high and low priority flows based on metrics including IP precedence and traffic
volume.
For more information on this feature, refer to the Cisco IOS Quality of Service Solutions Configuration
Guide.
Resource Reservation Protocol
Resource Reservation Protocol (RSVP) works in conjunction with WFQ; it helps the router establish a
weight for different types of packets that affect the order in which the packets enter the output queue and
are placed on the cable network for transmission. Voice packets are routed through the interface with a
QoS method that allows the packets to receive priority over standard data frames. A router that supports
RSVP gives priority to packets that fall into a reservation within RSVP.
For more information on this feature, refer to the Cisco IOS Quality of Service Solutions Configuration
Guide.
Committed Access Rate (CAR)
Committed Access Rate (CAR) provides the means to allocate and limit bandwidth to traffic sources and
destinations, and specify policies to handle traffic exceeding the bandwidth allocation. CAR policies can
be utilized at the ingress or egress of the network. CAR uses token bucket filters to measure traffic load
and limit sources to bandwidth allocations.
Security Features
The following sections describe features that enhance the security of devices attached to the
Cisco uBR7200 series cable access routers.
