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CHAPTER
5-1
Cisco IOS XE Integrated Session Border Controller Configuration Guide for the Cisco ASR 1000 Series Aggregation Services Routers
OL-15421-01
5
Quality of Service and Bandwidth Management
Integrated Session Border Controller (SBC) for the Cisco ASR 1000 Series Routers provides Quality of
Service (QoS) and bandwidth management features to assure quality end-to-end connection for real-time
voice, video, and multimedia traffic. The packet marked for higher priority is delivered faster than
non-prioritized packets. The Cisco ASR 1000 Series Aggregation Services Routers support QoS
functions such as Low Latency Queueing (LLQ), Class-Based Weighted Fair Queueing (CBWFQ), and
shaping at the subinterface level.
At the SBC level, the data border element (DBE) has different packages to enhance QoS and these
packages are described in this chapter. For a complete description of commands used in this chapter,
refer to the
Cisco IOS Integrated Session Border Controller Command Reference.
Contents
• H.248 Traffic Management Package Support, page 5-1
• DSCP Marking and IP Precedence Marking, page 5-3
• QoS Bandwidth Allocation, page 5-4
• RTCP Policing, page 5-4
• Two-Rate Three-Color Policing and Marking, page 5-5
H.248 Traffic Management Package Support
The DBE supports the sustained data rate (tman/sdr), maximum burst size (tman/mbs), and policing
(tman/pol) properties of the ETSI TS 102 333 Traffic Management (Tman) package.
1
Support of these
tman properties allows additional pinhole programming in the Tman package to inform the DBE how to
police media and signaling flows. These tman properties can be assigned to both media and signaling
flows.
The DBE performs asymmetric policing. Asymmetric policing allows the MGC to impose different flow
policing on traffic traveling in each direction on the same stream. For example, traffic traveling from the
subscriber side to the DBE can be policed independently of traffic from the network core to the DBE.
Asymmetric policing is accomplished by allowing the tman/pol property to be specified separately for
the two sides of a gate, which typically might be the access (subscriber) side and the back bone side. The
tman/pol property can be specified as ON, OFF, or Absent on either the access side or the back bone side
1. ETSI TS 102 333 version 1.1.2 Traffic Management Package