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8-7
Cisco IP Telephony Network Design Guide
78-11103-03
Chapter 8 Quality of Service
WAN QoS Model
Figure 8-3 Optimized Queuing for VoIP over the WAN
The following points must be taken into account when configuring low-latency
queuing (LLQ):
• The minimum system software for leased lines and Asynchronous Transfer
Mode (ATM) is Cisco IOS Release 12.1(2)T.
• The minimum system software for Frame Relay is
Cisco IOS Release 12.1(2)T.
Table 8-3 gives the minimum bandwidth requirements for voice, video, and data
networks using Cisco CallManager Release 3.0(5). Note that these values are
minimum, and any network should be engineered with adequate capacity.
Link Efficiency Techniques
Because wide-area bandwidth is often prohibitively expensive, only low-speed
circuits may be available or cost effective when interconnecting remote sites. In
these cases, it is important to achieve the maximum savings by transmitting as
many voice calls as possible over the low-speed link. Many compression
Class = X
Class = Y
CBWFQ
Default
Police
Layer 3 Queuing Subsystem Layer 2 Queuing Subsystem
Low Latency Queuing Link Fragmentation and
Interleave
Fragment
Interleave
PQ Voice
PQ Video
49086
Packets
out
WFQ
TX
Ring
1 1
1 1
1 1
0
0
0 0 0
4
4
4 4
3
3
3
2
2
2
Packets out
Packets in
Table 8-3 Minimum Bandwidth Requirements with Cisco CallManager 3.0(5)
Traffic Type Leased Lines Frame Relay ATM
ATM/Frame
Relay
Voice + data 64 kbps 64 kbps 128 kbps 128 kbps
Voice, video,
and data
768 kbps 768 kbps 768 kbps 768 kbps
- Cisco IP Telephony 1
- Network Design Guide 1
- CONTENTS 3
- Contents 4
- 4 Gateway Selection 4-1 6
- 8 Quality of Service 8-1 8
- 11 Network Management 11-1 10
- Audience 12
- Organization 12
- Revision History 14
- Conventions 15
- Additional Information 17
- Obtaining Documentation 18
- Documentation Feedback 19
- Cisco.com 19
- Technical Assistance Center 20
- Contacting TAC by Telephone 21
- Introduction 23
- Chapter 1 Introduction 24
- General Design Models 24
- Single-Site Model 25
- Overview 36
- Power Protection Strategies 38
- Network Infrastructure 39
- High Availability 41
- Further Information 42
- Physical Connectivity Options 43
- Power to IP Phones 44
- Daughtercard 45
- Inline Power Configuration 47
- Power Consumption 49
- Error and Status Messages 50
- Dual Supervisors 50
- Power Protection 50
- External Patch Panel Power 51
- Summary of Recommendations 54
- Wall Power 54
- IP Addressing and Management 55
- CDP Enhancements 56
- Power Requirement Field 57
- Voice VLAN Configuration 58
- Connecting to the Network 59
- Trust Boundaries 63
- Untagged 802.3 64
- Tagged 802.1q 64
- QoS Commands 67
- Cisco CallManager Clusters 73
- Device Weights 75
- Intracluster Communication 77
- Cisco CallManager Redundancy 78
- Device Pool Configuration 81
- Campus Clustering Guidelines 84
- Intercluster Communication 86
- Gateway Selection 95
- Supported Protocols 96
- DTMF Relay 97
- Skinny Gateways 98
- Cisco IOS H.323 Gateways 98
- MGCP Gateway 100
- Supplementary Services 101
- IOS H.323 Gateways 102
- Chapter 4 Gateway Selection 104
- 78-11103-03 104
- Protocol 107
- Skinny Gateway 107
- Dial Plan Architecture and 109
- Configuration 109
- Route Pattern 114
- Route List 115
- Route Group 115
- Digit Translation Tables 117
- On-Net Route Pattern 119
- Restrictions 122
- Partitions 123
- Calling Search Space 123
- The Role of a Gatekeeper 129
- Processing 131
- Call Admission Control 133
- Operational Model 138
- Gatekeeper Configuration 139
- Dial Plan Considerations 145
- Conferencing 160
- Intercluster Calls 168
- Local PSTN Calls 168
- Design Example 168
- Quality of Service 175
- Traffic Classification 176
- Interface Queuing 176
- Chapter 8 Quality of Service 177
- Campus QoS Model 177
- WAN QoS Model 178
- WAN QoS Tools 179
- Link Efficiency Techniques 181
- Traffic Shaping 183
- Best Practices 184
- Catalyst DSP Provisioning 187
- Conferencing Design Details 190
- Conferencing Caveats 192
- Voice mail 194
- CallManager 194
- MTP Transcoding Caveats 198
- Catalyst 4000 Voice Services 199
- Catalyst 6000 Voice Services 201
- Network Models 203
- IP network 206
- Why is the DPA 7630 Needed? 223
- Can I Just Use SMDI? 223
- Choosing an Integration Mode 224
- Figure 10-12) 227
- Network Management 229
- Chapter 11 Network Management 230
- System Logging Components 231
- Syslog Collector 232
- SAenvProperties.ini 233
- Database 233
- CiscoWorks2000 236
- Campus Manager 239
- User Tracking 240
- Trace Path Analysis 241
- Resource Manager Essentials 243
- System Logging Management 244
- Syslog Message Filtering 246
- Glossary 250
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