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Preface Obtaining Technical Assistance Obtaining Technical Assistance Cisco provides Cisco.com, which includes the Cisco Technical Assistance Center (TAC) Website, as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from the Cisco TAC website. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC website, including TAC tools and utilities. Cisco.com Cisco.com offers a suite of interactive, networked services that let you access Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world. Cisco.com provides a broad range of features and services to help you with these tasks: • Streamline business processes and improve productivity • Resolve technical issues with online support • Download and test software packages • Order Cisco learning materials and merchandise • Register for online skill assessment, training, and certification programs To obtain customized information and service, you can self-register on Cisco.com at this URL: http://www.cisco.com Technical Assistance Center The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two levels of support are available: the Cisco TAC website and the Cisco TAC Escalation Center. The avenue of support that you choose depends on the priority of the problem and the conditions stated in service contracts, when applicable. OL-2031-02 Catalyst 4224 Access Gateway Switch Software Configuration Guide xxiii

Section	Page
Catalyst 4224 Access Gateway Switch Software Configuration Guide	1
Contents	3
Preface	17
Objectives	17
Audience	18
Organization	18
Related Documentation	19
Conventions	20
Obtaining Documentation	21
Cisco.com	21
Documentation CD-ROM	21
Ordering Documentation	22
Documentation Feedback	22
Obtaining Technical Assistance	23
Cisco.com	23
Technical Assistance Center	23
Cisco TAC Website	24
Cisco TAC Escalation Center	25
Obtaining Additional Publications and Information	25
Product Overview	27
Features	28
Solution	29
IP Telephony	31
Ethernet Switching	31
Survivable Remote Site Telephony	32
VoIP Gateway	32
IP Routing and WAN Features	33
Quality of Service	35
VPN and Firewall Features	35
Application Notes	36
Architecture	36
DSP Allocation	37
InterVLAN Routing	40
Quality of Service	40
Layer 2 QoS	40
Separate Voice and Data VLANs	41
Single Voice and Data VLAN with dot1p	41
Layer 3 QoS	42
WAN QoS Queuing and Scheduling	42
Summary of the Layer 3 WAN QoS Features	42
Configuration Guidelines	44
Default Port Configuration	44
Separate VLAN for Voice and Data	45
Port Configuration for a Single Subnet	45
InterVLAN and WAN Routing Configuration	46
Centralized CiscoCallManager and DHCP Server	46
Voice Port Configuration	47
Interface Range Command Support	48
Switched Port Analyzer (SPAN)	48
Recommended Configurations	48
No VTP or DTP Support	49
Creating a VLAN	49
Defining a VLAN on a Trunk Port	49
Trunking	50
Fractional PRI Configuration	50
No Ring Back Tone Generated	51
MTP Required on CiscoCallManager	52
H323-Gateway VOIP Bind SRCADDR Command	53
Port Fast Not Enabled on Trunk Ports	54
Priority Queuing on Frame Relay	54
Maximum Number of VLAN and Multicast Groups	55
IP Multicast Support	55
Configuring for the First Time	57
First-Time Configuration	57
Booting the Catalyst 4224	58
Downloading an Image to Boot Flash Memory	58
Connecting a Terminal	59
Connecting a Modem	59
Configuring the Management Port	59
Interface Numbering	60
Using the Cisco IOS CLI	61
Getting Help	62
Command Modes	62
Disabling a Command or Feature	64
Saving Configuration Changes	64
Configuring Ethernet Switching	65
Configuring the Catalyst4224 for Cisco IP Telephony	65
Default Switch Configuration	66
Connecting IP Phones to Your Campus Network	66
Configuring Ethernet Ports to Support IP Phones and a Daisy-Chained Workstation	67
Configuring Separate Voice and Data Subnets	68
Voice Traffic and VVID	69
Sample Configuration 1	70
Sample Configuration 2	70
Configuring a Single Subnet for Voice and Data	71
Sample Configuration	73
Configuring Ethernet Ports to Support IP Phones with Multiple Ports	73
IP Addressing	73
Sample Configuration	74
Managing the Catalyst4224 Access Gateway Switch	74
Adding Trap Managers	75
Configuring IP Information	75
Assigning IP Information to the Switch—Overview	75
Assigning IP Information to the Switch—Procedure	76
Removing an IP Address	77
Specifying a Domain Name and Configuring the DNS	77
Specifying the Domain Name	78
Specifying a Name Server	78
Enabling the DNS	78
Configuring Voice Ports	78
Configuring a Port to Connect to a Cisco 7960 IP Phone	79
Disabling Inline Power on a Catalyst4224	79
Enabling and Disabling Switch Port Analyzer	80
Enabling the Switch Port Analyzer	81
Disabling Switch Port Analyzer	81
Managing the ARP Table	81
Managing the MAC Address Tables	82
MAC Addresses and VLANs	83
Changing the Address Aging Time	83
Configuring the Aging Time	83
Removing Dynamic Address Entries	84
Adding Secure Addresses	84
Adding Secure Addresses	85
Removing Secure Addresses	85
Adding and Removing Static Addresses	86
Adding Static Addresses	86
Removing Static Addresses	87
Configuring the Data Interfaces	89
Configuring the Host Name and Password	90
Configuring the Fast Ethernet Interface	92
Configuring Asynchronous/Synchronous Serial Interfaces	94
Configuring ISDN BRI Interfaces	97
Configuring T1 and E1 Interfaces	100
Configuring T1 Interfaces	100
Configuring E1 Interfaces	104
Checking the Interface Configuration	106
Saving Configuration Changes	107
Configuring the Voice Interfaces	109
Configuring Voice Interfaces	109
MGCP Configuration	111
Enabling MGCP	112
Enabling Switchover and Switchback	113
Configuring FXS and FXO Analog Ports	116
Configuring T1-CAS E&M Emulation	116
Configuring T1/E1 (ISDN-PRI) Ports	118
Configuring T1 Interfaces	118
Configuring E1 Interfaces	121
Where to Go Next	124
H.323 Gateway Configuration	124
Configuring T1-CAS Analog Emulation (H.323)	127
Managing Input Gain for Cisco IP Voice Applications	129
FXS Emulation Example	129
FXO Emulation Example	131
E&M Emulation Example	131
ISDN BRI Configuration (H.323)	132
Configuring ISDN BRI Lines	134
ISDN BRI Provisioning by Switch Type	134
Defining ISDN Service Profile Identifiers	137
BRI Direct-Inward Dialing Configuration	137
Gateway 1 Configuration	138
Gateway 2 Configuration	139
T1/E1 Configuration (H.323)	139
Configuring T1 Interfaces	139
T1/PRI Configuration Example	141
Configuring E1 Interfaces	141
E1/PRI Configuration Example	142
E&M Trunk Line Configuration (H.323)	143
Scenario	143
Handling Incoming Caller ID Digits on an E&M Port	144
Gateway San Jose Configuration	145
Gateway Salt Lake City Configuration	145
Configuring VoIP	147
Prerequisite Tasks	148
Configuration Tasks	149
Configure IP Networks for Real-Time Voice Traffic	149
Configure RSVP for Voice	151
Enable RSVP	151
RSVP Configuration Example	152
Configure Multilink Point-to-Point Protocol with Interleaving	153
Multilink PPP Configuration Example	155
Configure Real-Time Transport Protocol Header Compression	155
Enable RTP Header Compression on a Serial Interface	157
Change the Number of Header Compression Connections	157
RTP Header Compression Configuration Example	157
Configure Custom Queuing	157
Configure Weighted Fair Queuing	158
Configure Number Expansion	158
Create a Number Expansion Table	159
Configure Number Expansion	161
Configure Dial Peers	161
Inbound Versus Outbound Dial Peers	163
Create a Dial-Peer Configuration Table	165
Configure POTS Dial Peers	166
Outbound Dialing on POTS Dial Peers	166
Configure VoIP Dial Peers	167
Verifying Your Configuration	167
Troubleshooting Tips	168
Configure Voice Ports	168
Configure FXS or FXO Voice Ports	169
Verifying Your Configuration	170
Troubleshooting Tips	171
Fine-Tune FXS and FXO Voice Ports	171
Configure E&M Voice Ports	173
Verifying Your Configuration	175
Troubleshooting Tips	176
Fine-Tune E&M Voice Ports	176
Additional VoIP Dial-Peer Configurations	179
Configure IP Precedence for Dial Peers	179
Configure RSVP for Dial Peers	180
Configure codec and VAD for Dial Peers	181
Configure codec for a VoIP Dial Peer	181
Configure VAD for a VoIP Dial Peer	182
Configure Frame Relay for VoIP	183
Frame Relay for VoIP Configuration Example	184
Configuring the Eight-Port FXS RJ-21 Module	187
Eight-Port RJ-21 FXS Module User Interface Conventions	188
Configuring FXS Voice Ports	188
Changing Default Configurations	188
Validating the Configuration	190
Troubleshooting the Configuration	191
Fine-Tuning FXS Voice Ports	192
Activating the Voice Port	194
Sample Configuration	194
Cisco 2600 Sample Configuration	196
FXS Module Sample Configuration	196
Displaying Cisco 2600 Configuration Values	197
Displaying FXS Module Configuration Values	198
Configuring Survivable Remote Site Telephony	201
Overview of Survivable Remote Site Telephony	202
Restrictions	202
Prerequisites	203
Supported Features	203
Fallback Behavior	204
Configuring Survivable Remote Site Telephony	207
Verifying Survivable Remote Site Telephony	209
Troubleshooting Survivable Remote Site Telephony	210
Monitoring and Maintaining Survivable Remote Site Telephony	211
SRST Configuration Example	212
Implementing Fax over IP on Cisco Voice Gateways	215
Overview	216
Fax Pass-Through	216
Cisco Fax Relay	217
Supported Platforms and Features	218
Traffic Shaping	219
About Traffic Shaping	220
Why Use Traffic Shaping?	220
Traffic Shaping and Rate of Transfer	221
Discard Eligible Bit	222
Differences Between Shaping Mechanisms	222
Traffic Shaping and Queueing	224
Generic Traffic Shaping	224
How It Works	224
Configuration and Commands	225
Class-Based Traffic Shaping	226
How It Works	226
Configuration and Commands	226
Restrictions	227
Frame Relay Traffic Shaping	227
How It Works	228
Derived Rates	228
Configuration and Commands	229
Restrictions	230
Distributed Traffic Shaping	230
Prerequisites	230
How It Works	230
Configuration	231
Restrictions	232
Low-Latency Queueing	232
Configuring Encryption Services	235
Configuring the Encryption Service Adapter	236
Step 1: Configure the T1 Channel Group	236
Step 2: Configure the Internet Key Exchange Security Protocol	237
Step 3: Configure IPSec Network Security	239
Step 4: Configure Encryption on the T1 Channel Group Serial Interface	242
Verifying the Configuration	243
Sample Configurations	243
Encrypting Traffic Between Two Networks	244
Configuration File for the Public Gateway	244
Configuration File for the Private Gateway	245
Exchanging Encrypted Data Through an IPSec Tunnel	248
Configuration File for Peer 1	248
Configuration File for Peer 2	250
Configuring Other Routing Protocols	253
Novell IPX	253
The Cisco Implementation of Novell IPX	253
IPX MIB Support	254
IPX Enhanced IGRP Support	254
LAN Support	255
VLAN Support	255
Multilayer Switching Support	255
IPX Configuration	255
IBM SNA	256
The Cisco Four-Phase Model for SNA-to-IP Integration	256
Phase One: SNA Centric	258
Phase Two: IP Transport	259
Phase Three: IP Client	260
Phase Four: IP Centric	261
Summary of Four-Phase Model	261
Scenarios for SNA-to-IP Integration	262
Line Consolidation	262
FEP Replacement	262
Desktop Consolidation	263
SNA Configuration	264
Command Reference for Voice VLAN	265
interface range	265
Syntax	265
Syntax Description	266
Defaults	266
Command Modes	266
Usage Guidelines	266
Example	266
interface vlan	267
Syntax	267
Syntax Description	267
Defaults	267
Command Modes	267
Usage Guidelines	267
Example	268
monitor session	268
Syntax	268
Syntax Description	268
Defaults	268
Command Modes	269
Usage Guidelines	269
Examples	269
spanning-tree	270
Syntax	270
Syntax Description	270
Defaults	270
Command Modes	270
Usage Guidelines	270
Example	271
spanning-tree portfast	271
Syntax	271
Syntax Description	271
Defaults	272
Command Modes	272
Usage Guidelines	272
Example	272
switchport access	272
Syntax	273
Syntax Description	273
Defaults	273
Command Modes	273
Usage Guidelines	273
Example	273
switchport voice vlan	274
Syntax	274
Syntax Description	274
Defaults	275
Command Modes	275
Usage Guidelines	275
Example	275
Synopsis of Basic VoIP Concepts	277
VoIP Overview	277
A Voice Primer	278
How VoIP Processes a Typical Telephone Call	278
Numbering Scheme	279
Analog Versus Digital	279
codecs	280
Mean Opinion Score	280
Delay	281
Jitter	282
End-to-End Delay	283
Echo	283
Signaling	283
VoIP Configuration Examples	285
FXS-to-FXS Connection Using RSVP	285
Configuration for Catalyst4224 RLB-1	287
Configuration for Catalyst4224 RLB-w	288
Configuration for Catalyst4224 RLB-e	289
Configuration for Catalyst4224 RLB-2	290
Linking PBX Users with E&M Trunk Lines	291
Router San Jose Configuration	292
Router Salt Lake City Configuration	293
FXO Gateway to PSTN	294
Router San Jose Configuration	295
Router Salt Lake City Configuration	295
FXO Gateway to PSTN (PLAR Mode)	296
Router San Jose Configuration	297
Router Salt Lake City Configuration	297