Cisco Catalyst 3650 User manual

IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE
(Catalyst 3650 Switches)
First Published: October 10, 2013
Last Modified: October 22, 2013
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Text Part Number: OL-29890-01

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CONTENTS
Preface Preface xix
Document Conventions xix
Related Documentation xxi
Obtaining Documentation and Submitting a Service Request xxi
CHAPTER 1 Using the Command-Line Interface 1
Information About Using the Command-Line Interface 1
Command Modes 1
Using the Help System 3
Understanding Abbreviated Commands 4
No and Default Forms of Commands 5
CLI Error Messages 5
Configuration Logging 5
How to Use the CLI to Configure Features 6
Configuring the Command History 6
Changing the Command History Buffer Size 6
Recalling Commands 6
Disabling the Command History Feature 7
Enabling and Disabling Editing Features 7
Editing Commands Through Keystrokes 8
Editing Command Lines That Wrap 9
Searching and Filtering Output of show and more Commands 10
Accessing the CLI 11
Accessing the CLI Through a Console Connection or Through Telnet 11
CHAPTER 2 Using the Web Graphical User Interface 13
Prerequisites for Using the Web GUI 13
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Information About Using The Web GUI 13
Web GUI Features 13
Connecting the Console Port of the Device 15
Logging On to the Web GUI 15
Enabling Web and Secure Web Modes 15
Configuring the Device Web GUI 16
CHAPTER 3 Configuring IGMP 21
Finding Feature Information 21
Restrictions for Configuring IGMP 21
Information About IGMP 22
IP Multicast Group Addresses 22
IGMP Versions 23
IGMP Version 1 23
IGMP Version 2 23
IGMP Version 3 23
IGMP Version Differences 24
IGMPv3 Host Signalling 26
IGMP Join and Leave Process 27
IGMP Join Process 27
IGMP Leave Process 27
IGMP Snooping 28
Joining a Multicast Group 28
Leaving a Multicast Group 30
Immediate Leave 31
IGMP Configurable-Leave Timer 31
IGMP Report Suppression 31
IGMP Snooping and Device Stacks 32
IGMP Filtering and Throttling Overview 32
Default IGMP Configuration 32
Default IGMP Snooping Configuration 33
Default IGMP Filtering and Throttling Configuration 33
How to Configure IGMP 34
Configuring the Device as a Member of a Group (CLI) 34
Controlling Access to IP Multicast Group (CLI) 36
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Modifying the IGMP Host-Query Message Interval (CLI) 38
Changing the IGMP Query Timeout for IGMPv2 (CLI) 40
Changing the Maximum Query Response Time for IGMPv2 (CLI) 42
Configuring the Device as a Statically Connected Member (CLI) 44
Configuring IGMP Profiles (CLI) 45
Applying IGMP Profiles (CLI) 47
Setting the Maximum Number of IGMP Groups (CLI) 49
Configuring the IGMP Throttling Action (CLI) 50
Configuring the Device to Forward Multicast Traffic in the Absence of Directly Connected
IGMP Hosts 53
Controlling Access to an SSM Network Using IGMP Extended Access Lists 54
How to Configure IGMP Snooping 57
Enabling or Disabling IGMP Snooping on a Device (CLI) 57
Enabling or Disabling IGMP Snooping on a VLAN Interface (CLI) 59
Setting the Snooping Method (CLI) 60
Configuring a Multicast Router Port (CLI) 61
Configuring a Host Statically to Join a Group (CLI) 62
Enabling IGMP Immediate Leave (CLI) 64
Configuring the IGMP Leave Timer (CLI) 65
Configuring the IGMP Robustness-Variable (CLI) 67
Configuring the IGMP Last Member Query Count (CLI) 68
Configuring TCN-Related Commands 70
Controlling the Multicast Flooding Time After a TCN Event (CLI) 70
Recovering from Flood Mode (CLI) 71
Disabling Multicast Flooding During a TCN Event (CLI) 73
Configuring the IGMP Snooping Querier (CLI) 74
Disabling IGMP Report Suppression (CLI) 77
Monitoring IGMP 78
Displaying IGMP Snooping Information 79
Displaying IGMP Filtering and Throttling Configuration 80
Configuration Examples for IGMP 81
Example: Configuring the Device as a Member of a Multicast Group 81
Example: Controlling Access to Multicast Groups 81
Examples: Configuring IGMP Snooping 81
Examples: Configuring Filtering and Throttling 82
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Example: Interface Configuration as a Routed Port 83
Example: Interface Configuration as an SVI 83
Example: Configuring the Device to Forward Multicast Traffic in the Absence of Directly
Connected IGMP Hosts 84
Controlling Access to an SSM Network Using IGMP Extended Access Lists 84
Example: Denying All States for a Group G 85
Example: Denying All States for a Source S 85
Example: Permitting All States for a Group G 85
Example: Permitting All States for a Source S 86
Example: Filtering a Source S for a Group G 86
Where to Go Next for IGMP 86
Additional References 87
Feature History and Information for IGMP 88
CHAPTER 4 Configuring IGMP Proxy 89
Finding Feature Information 89
Prerequisites for IGMP Proxy 89
Information about IGMP Proxy 90
IGMP Proxy 90
How to Configure IGMP Proxy 92
Configuring the Upstream UDL Device for IGMP UDLR 92
Configuring the Downstream UDL Device for IGMP UDLR with IGMP Proxy Support 93
Configuration Examples for IGMP Proxy 96
Example: IGMP Proxy Configuration 96
Where to Go Next for IGMP Proxy 97
Additional References 98
Feature History and Information for IGMP Proxy 99
CHAPTER 5 Constraining IP Multicast in Switched Ethernet 101
Finding Feature Information 101
Prerequisites for Constraining IP Multicast in a Switched Ethernet Network 101
Information About IP Multicast in a Switched Ethernet Network 102
IP Multicast Traffic and Layer 2 Switches 102
CGMP on Catalyst Switches for IP Multicast 102
IGMP Snooping 103
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Router-Port Group Management Protocol (RGMP) 103
How to Constrain Multicast in a Switched Ethernet Network 104
Configuring Switches for IP Multicast 104
Configuring IGMP Snooping 104
Enabling CGMP 104
Configuring IP Multicast in a Layer 2 Switched Ethernet Network 105
Configuration Examples for Constraining IP Multicast in a Switched Ethernet Network 107
Example: CGMP Configuration 107
RGMP Configuration Example 107
Where to Go Next for Constraining IP Multicast in Switched Ethernet 108
Additional References 108
Feature History and Information for Constraining IP Multicast in a Switched Ethernet
Network 109
CHAPTER 6 Configuring PIM 111
Finding Feature Information 111
Prerequisites for Configuring PIM 111
Restrictions for Configuring PIM 112
Restrictions for Configuring Auto-RP 112
Restrictions for Auto-RP Enhancement 113
Restrictions for Configuring Auto-RP and BSR 113
Information About PIM 113
PIM Versions 114
PIMv1 and PIMv2 Interoperability 114
PIM Modes 115
PIM DM 115
PIM-SM 115
Multicast Source Discovery Protocol (MSDP) 116
PIM Stub Routing 116
IGMP Helper 117
Auto-RP 117
The Role of Auto-RP in a PIM Network 118
IP Multicast Boundary 119
Auto-RP Benefits 119
Benefits of Auto-RP in a PIM Network 120
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PIM v2 BSR 120
Multicast Forwarding and Reverse Path Check 120
PIM Shared Tree and Source Tree 122
Default PIM Routing Configuration 123
How to Configure PIM 124
Enabling PIM Stub Routing (CLI) 124
Configuring a Rendezvous Point 126
Manually Assigning an RP to Multicast Groups (CLI) 127
Setting Up Auto-RP in a New Internetwork (CLI) 129
Adding Auto-RP to an Existing Sparse-Mode Cloud (CLI) 131
Preventing Join Messages to False RPs (CLI) 134
Filtering Incoming RP Announcement Messages (CLI) 134
Configuring PIMv2 BSR 136
Defining the PIM Domain Border (CLI) 137
Defining the IP Multicast Boundary (CLI) 139
Configuring Candidate BSRs (CLI) 141
Configuring the Candidate RPs (CLI) 142
Configuring Auto-RP and BSR for the Network (CLI) 144
Configuring Sparse Mode with Auto-RP 146
Delaying the Use of PIM Shortest-Path Tree (CLI) 151
Modifying the PIM Router-Query Message Interval (CLI) 153
Monitoring PIM 155
Monitoring RP Mapping 156
Troubleshooting PIMv1 and PIMv2 Interoperability Problems 156
Configuration Examples for PIM 156
Example: Enabling PIM Stub Routing 156
Example: Verifying PIM Stub Routing 157
Example: Manually Assigning an RP to Multicast Groups 157
Example: Configuring Auto-RP 157
Example: Sparse Mode with Auto-RP 158
Example: Defining the IP Multicast Boundary to Deny Auto-RP Information 158
Example: Filtering Incoming RP Announcement Messages 158
Example: Preventing Join Messages to False RPs 159
Example: Configuring Candidate BSRs 159
Example: Configuring Candidate RPs 159
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Where to Go Next for PIM 160
Additional References 160
Feature History and Information for PIM 162
CHAPTER 7 Configuring PIM MIB Extension for IP Multicast 163
Finding Feature Information 163
Information About PIM MIB Extension for IP Multicast 163
PIM MIB Extensions for SNMP Traps for IP Multicast 163
Benefits of PIM MIB Extensions 164
How to Configure PIM MIB Extension for IP Multicast 164
Enabling PIM MIB Extensions for IP Multicast 164
Configuration Examples for PIM MIB Extensions 166
Example Enabling PIM MIB Extensions for IP Multicast 166
Additional References 166
CHAPTER 8 Configuring MSDP 169
Finding Feature Information 169
Prerequisites for Using MSDP to Interconnect Multiple PIM-SM Domains 169
Information About Using MSDP to Interconnect Multiple PIM-SM Domains 170
Benefits of Using MSDP to Interconnect Multiple PIM-SM Domains 170
Use of MSDP to Interconnect Multiple PIM-SM Domains 170
MSDP Message Types 172
SA Messages 173
SA Request Messages 173
SA Response Messages 173
Keepalive Messages 173
SA Message Origination Receipt and Processing 174
SA Message Origination 174
SA Message Receipt 174
How RPF Check Rules Are Applied to SA Messages 174
How the Software Determines the Rule to Apply to RPF Checks 175
Rule 1 of RPF Checking of SA Messages in MSDP 175
Implications of Rule 1 of RPF Checking on MSDP 175
Rule 2 of RPF Checking of SA Messages in MSDP 176
Implications of Rule 2 of RPF Checking on MSDP 176
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Rule 3 of RPF Checking of SA Messages in MSDP 176
SA Message Processing 177
MSDP Peers 177
MSDP MD5 Password Authentication 177
How MSDP MD5 Password Authentication Works 178
Benefits of MSDP MD5 Password Authentication 178
SA Message Limits 178
MSDP Keepalive and Hold-Time Intervals 178
MSDP Connection-Retry Interval 179
Default MSDP Peers 179
MSDP Mesh Groups 180
Benefits of MSDP Mesh Groups 181
SA Origination Filters 181
Use of Outgoing Filter Lists in MSDP 182
Use of Incoming Filter Lists in MSDP 182
TTL Thresholds in MSDP 183
SA Request Messages 183
SA Request Filters 184
How to Use MSDP to Interconnect Multiple PIM-SM Domains 184
Configuring an MSDP Peer 184
Shutting Down an MSDP Peer 186
Configuring MSDP MD5 Password Authentication Between MSDP Peers 187
Troubleshooting Tips 188
Preventing DoS Attacks by Limiting the Number of SA Messages Allowed in the SA Cache
from Specified MSDP Peers 189
Adjusting the MSDP Keepalive and Hold-Time Intervals 190
Adjusting the MSDP Connection-Retry Interval 192
Configuring a Default MSDP Peer 192
Configuring an MSDP Mesh Group 193
Controlling SA Messages Originated by an RP for Local Sources 195
Controlling the Forwarding of SA Messages to MSDP Peers Using Outgoing Filter
Lists 196
Controlling the Receipt of SA Messages from MSDP Peers Using Incoming Filter Lists 197
Using TTL Thresholds to Limit the Multicast Data Sent in SA Messages 198
Requesting Source Information from MSDP Peers 199
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Controlling the Response to Outgoing SA Request Messages from MSDP Peers Using SA
Request Filters 200
Including a Bordering PIM Dense Mode Region in MSDP 201
Configuring an Originating Address Other Than the RP Address 202
Monitoring MSDP 203
Clearing MSDP Connections Statistics and SA Cache Entries 206
Enabling SNMP Monitoring of MSDP 207
Troubleshooting Tips 208
Configuration Examples for Using MSDP to Interconnect Multiple PIM-SM Domains 209
Example: Configuring an MSDP Peer 209
Example: Configuring MSDP MD5 Password Authentication 209
Example: Configuring a Default MSDP Peer 210
Example: Configuring MSDP Mesh Groups 212
Where to Go Next for MSDP 212
Additional References 213
Feature History and Information for Multicast Source Discovery Protocol 214
CHAPTER 9 Configuring Wireless Multicast 215
Finding Feature Information 215
Prerequisites for Configuring Wireless Multicast 215
Restrictions for Configuring Wireless Multicast 216
Information About Wireless Multicast 216
Information About Multicast Optimization 217
How to Configure Wireless Multicast 217
Configuring Wireless Multicast-MCMC Mode (CLI) 217
Configuring Wireless Multicast-MCUC Mode (CLI) 218
Configuring IPv6 Snooping (CLI) 219
Configuring IPv6 Snooping Policy (CLI) 220
Configuring Layer 2 Port as Multicast Router Port (CLI) 221
Configuring RA Guard (CLI) 222
Configuring Non-IP Wireless Multicast (CLI) 223
Configuring Wireless Broadcast (CLI) 224
Configuring IP Multicast VLAN for WLAN (CLI) 225
Monitoring Wireless Multicast 226
Where to Go Next for Wireless Multicast 227
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Additional References 228
CHAPTER 10 Configuring SSM 231
Finding Feature Information 231
Prerequisites for Configuring SSM 231
Restrictions for Configuring SSM 232
Information About SSM 233
SSM Components Overview 233
How SSM Differs from Internet Standard Multicast 233
SSM Operations 234
Benefits of Source Specific Multicast 235
SSM Mapping 236
Static SSM Mapping 236
DNS-Based SSM Mapping 236
How to Configure SSM 237
Configuring Source Specific Multicast 237
Configuring Source Specific Multicast Mapping 240
Configuring Static SSM Mapping (CLI) 240
Configuring DNS-Based SSM Mapping (CLI) 242
Configuring Static Traffic Forwarding with SSM Mapping (CLI) 244
Monitoring SSM 245
Monitoring SSM Mapping 246
Configuration Examples for Source Specific Multicast 246
SSM with IGMPv3 Example 246
Where to Go Next for SSM 247
Additional References 247
Feature History and Information for SSM 249
CHAPTER 11 Configuring IP Multicast Routing 251
Finding Feature Information 251
Prerequisites for Configuring IP Multicast Routing 251
Restrictions for Configuring IP Multicast Routing 252
Information About IP Multicast Routing 252
Cisco’s Implementation of IP Multicast Routing 252
Multicast Forwarding Information Base Overview 253
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Multicast Group Concept 254
Multicast Boundaries 254
Multicast Routing and Device Stacks 255
Default Multicast Routing Configuration 256
How to Configure Basic IP Multicast Routing 256
Configuring Basic IP Multicast Routing (CLI) 256
Configuring IP Multicast Forwarding (CLI) 258
Configuring a Static Multicast Route (mroute) (CLI) 260
Configuring sdr Listener Support 262
Enabling sdr Listener Support (CLI) 262
Limiting How Long an sdr Cache Entry Exists (CLI) 264
Configuring an IP Multicast Boundary (CLI) 265
Monitoring and Maintaining IP Multicast Routing 268
Clearing Caches, Tables, and Databases 268
Displaying System and Network Statistics 269
Monitoring IP Multicast Routing 271
Configuration Examples for IP Multicast Routing 272
Example: Configuring an IP Multicast Boundary 272
Example: Responding to mrinfo Requests 272
Where to Go Next for IP Multicast 272
Additional References 273
Feature History and Information for IP Multicast 274
CHAPTER 12 Configuring the Service Discovery Gateway 275
Finding Feature Information 275
Restrictions for Configuring the Service Discovery Gateway 275
Information about the Service Discovery Gateway and mDNS 276
mDNS 276
mDNS-SD 276
mDNS-SD Considerations for Wireless Clients 276
Service Discovery Gateway 277
mDNS Gateway and Subnets 277
Filtering 278
How to Configure the Service Discovery Gateway 279
Configuring the Service List (CLI) 279
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Configuring Service List (GUI) 282
Enabling mDNS Gateway and Redistributing Services (CLI) 283
Enabling Multicast DNS Gateway (GUI) 286
Monitoring Service Discovery Gateway 287
Configuration Examples 287
Example: Specify Alternative Source Interface for Outgoing mDNS Packets 287
Example: Redistribute Service Announcements 287
Example: Disable Bridging of mDNS Packets to Wireless Clients 288
Example: Creating a Service-List, Applying a Filter and Configuring Parameters 288
Example: Enabling mDNS Gateway and Redistributing Services 288
Example: Global mDNS Configuration 289
Example: Interface mDNS Configuration 289
Where to Go Next for Configuring Services Discovery Gateway 289
Additional References 290
Feature History and Information for Services Discovery Gateway 291
CHAPTER 13 IP Multicast Optimization: Optimizing PIM Sparse Mode in a Large IP Multicast
Deployment 293
Finding Feature Information 293
Prerequisites for Optimizing PIM Sparse Mode in a Large IP Multicast Deployment 293
Information About Optimizing PIM Sparse Mode in a Large IP Multicast Deployment 294
PIM Registering Process 294
PIM Version 1 Compatibility 294
PIM Designated Router 295
PIM Sparse-Mode Register Messages 295
Preventing Use of Shortest-Path Tree to Reduce Memory Requirement 295
PIM Shared Tree and Source Tree - Shortest-Path Tree 296
Benefit of Preventing or Delaying the Use of the Shortest-Path Tree 297
How to Optimize PIM Sparse Mode in a Large IP Multicast Deployment 297
Optimizing PIM Sparse Mode in a Large Deployment 297
Configuration Examples for Optimizing PIM Sparse Mode in a Large Multicast
Deployment 299
Optimizing PIM Sparse Mode in a Large IP Multicast Deployment Example 299
Additional References 300
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Feature History and Information for Optimizing PIM Sparse Mode in a Large IP Multicast
Deployment 300
CHAPTER 14 IP Multicast Optimization: Multicast Subsecond Convergence 303
Finding Feature Information 303
Prerequisites for Multicast Subsecond Convergence 303
Restrictions for Multicast Subsecond Convergence 304
Information About Multicast Subsecond Convergence 304
Benefits of Multicast Subsecond Convergence 304
Multicast Subsecond Convergence Scalability Enhancements 304
PIM Router Query Messages 304
Reverse Path Forwarding 305
RPF Checks 305
Triggered RPF Checks 305
RPF Failover 305
Topology Changes and Multicast Routing Recovery 306
How to Configure Multicast Subsecond Convergence 306
Modifying the Periodic RPF Check Interval 306
Configuring PIM RPF Failover Intervals 307
Modifying the PIM Router Query Message Interval 308
Verifying Multicast Subsecond Convergence Configurations 309
Configuration Examples for Multicast Subsecond Convergence 310
Example Modifying the Periodic RPF Check Interval 310
Example Configuring PIM RPF Failover Intervals 311
Modifying the PIM Router Query Message Interval Example 311
Additional References 311
Feature History and Information for Multicast Subsecond Convergence 312
CHAPTER 15 IP Multicast Optimization: IP Multicast Load Splitting across Equal-Cost Paths 313
Finding Feature Information 313
Prerequisites for IP Multicast Load Splitting across Equal-Cost Paths 313
Information About IP Multicast Load Splitting across Equal-Cost Paths 314
Load Splitting Versus Load Balancing 314
Default Behavior for IP Multicast When Multiple Equal-Cost Paths Exist 314
Methods to Load Split IP Multicast Traffic 316
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Overview of ECMP Multicast Load Splitting 317
ECMP Multicast Load Splitting Based on Source Address Using the S-Hash
Algorithm 317
ECMP Multicast Load Splitting Based on Source and Group Address Using the Basic
S-G-Hash Algorithm 317
Predictability As a By-Product of Using the S-Hash and Basic S-G-Hash
Algorithms 317
Polarization As a By-Product of Using the S-Hash and Basic S-G-Hash
Algorithms 318
ECMP Multicast Load Splitting Based on Source Group and Next-Hop Address 319
Effect of ECMP Multicast Load Splitting on PIM Neighbor Query and Hello Messages
for RPF Path Selection 320
Effect of ECMP Multicast Loading Splitting on Assert Processing in PIM-DM and DF
Election in Bidir-PIM 320
Effect of ECMP Multicast Load Splitting on the PIM Assert Process in PIM-SM and
PIM-SSM 322
ECMP Multicast Load Splitting and Reconvergence When Unicast Routing
Changes 323
Use of BGP with ECMP Multicast Load Splitting 323
Use of ECMP Multicast Load Splitting with Static Mroutes 323
Alternative Methods of Load Splitting IP Multicast Traffic 324
How to Load Split IP Multicast Traffic over ECMP 324
Enabling ECMP Multicast Load Splitting 324
Prerequisites for IP Multicast Load Splitting - ECMP 325
Restrictions 325
Enabling ECMP Multicast Load Splitting Based on Source Address 325
Enabling ECMP Multicast Load Splitting Based on Source and Group Address 328
Enabling ECMP Multicast Load Splitting Based on Source Group and Next-Hop
Address 329
Configuration Examples for Load Splitting IP Multicast Traffic over ECMP 331
Example Enabling ECMP Multicast Load Splitting Based on Source Address 331
Example Enabling ECMP Multicast Load Splitting Based on Source and Group
Address 332
Example Enabling ECMP Multicast Load Splitting Based on Source Group and Next-Hop
Address 332
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Additional References 332
Feature History and Information for Load Splitting IP Multicast Traffic over ECMP 333
CHAPTER 16 IP Multicast Optimization: SSM Channel Based Filtering for Multicast 335
Finding Feature Information 335
Finding Feature Information 335
Prerequisites for SSM Channel Based Filtering for Multicast Boundaries 336
Information About the SSM Channel Based Filtering for Multicast Boundaries Feature 336
Rules for Multicast Boundaries 336
Benefits of SSM Channel Based Filtering for Multicast Boundaries 336
How to Configure SSM Channel Based Filtering for Multicast Boundaries 337
Configuring Multicast Boundaries 337
Configuration Examples for SSM Channel Based Filtering for Multicast Boundaries 338
Configuring the Multicast Boundaries Permitting and Denying Traffic Example 338
Configuring the Multicast Boundaries Permitting Traffic Example 339
Configuring the Multicast Boundaries Denying Traffic Example 339
Additional References 340
Feature History and Information for SSM Channel Based Filtering for Multicast Boundaries 340
CHAPTER 17 IP Multicast Optimization: PIM Dense Mode State Refresh 341
Finding Feature Information 341
Prerequisite for PIM Dense Mode State Refresh 341
Restrictions on PIM Dense Mode State Refresh 342
Information About PIM Dense Mode State Refresh 342
PIM Dense Mode State Refresh Overview 342
Benefits of PIM Dense Mode State Refresh 342
How to Configure PIM Dense Mode State Refresh 343
Configuring PIM Dense Mode State Refresh 343
Verifying PIM Dense Mode State Refresh Configuration 343
Monitoring and Maintaining PIM DM State Refresh 344
Configuration Examples for PIM Dense Mode State Refresh 345
Originating Processing and Forwarding PIM Dense Mode State Refresh Control Messages
Example 345
Processing and Forwarding PIM Dense Mode State Refresh Control Messages Example 345
Additional References 345
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Feature History and Information for PIM Dense Mode State Refresh 347
CHAPTER 18 IP Multicast Optimization: IGMP State Limit 349
Finding Feature Information 349
Prerequisites for IGMP State Limit 349
Restrictions for IGMP State Limit 350
Information About IGMP State Limit 350
IGMP State Limit 350
IGMP State Limit Feature Design 350
Mechanics of IGMP State Limiters 350
How to Configure IGMP State Limit 351
Configuring IGMP State Limiters 351
Configuring Global IGMP State Limiters 351
Configuring Per Interface IGMP State Limiters 352
Configuration examples for IGMP State Limit 354
Configuring IGMP State Limiters Example 354
Additional References 356
Feature History and Information for IGMP State Limit 357
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Preface
•Document Conventions, page xix
•Related Documentation, page xxi
•Obtaining Documentation and Submitting a Service Request, page xxi
Document Conventions
This document uses the following conventions:
DescriptionConvention
Both the ^symbol and Ctrl represent the Control (Ctrl) key on a keyboard. For
example, the key combination ^D or Ctrl-D means that you hold down the Control
key while you press the D key. (Keys are indicated in capital letters but are not
case sensitive.)
^ or Ctrl
Commands and keywords and user-entered text appear in bold font.bold font
Document titles, new or emphasized terms, and arguments for which you supply
values are in italic font.
Italic font
Terminal sessions and information the system displays appear in courier font.Courier font
Bold Courier font indicates text that the user must enter.Bold Courier font
Elements in square brackets are optional.[x]
An ellipsis (three consecutive nonbolded periods without spaces) after a syntax
element indicates that the element can be repeated.
...
A vertical line, called a pipe, indicates a choice within a set of keywords or
arguments.
|
Optional alternative keywords are grouped in brackets and separated by vertical
bars.
[x | y]
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DescriptionConvention
Required alternative keywords are grouped in braces and separated by vertical
bars.
{x | y}
Nested set of square brackets or braces indicate optional or required choices
within optional or required elements. Braces and a vertical bar within square
brackets indicate a required choice within an optional element.
[x {y | z}]
A nonquoted set of characters. Do not use quotation marks around the string or
the string will include the quotation marks.
string
Nonprinting characters such as passwords are in angle brackets.< >
Default responses to system prompts are in square brackets.[ ]
An exclamation point (!) or a pound sign (#) at the beginning of a line of code
indicates a comment line.
!, #
Reader Alert Conventions
This document may use the following conventions for reader alerts:
Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Note
Means the following information will help you solve a problem.
Tip
Means reader be careful. In this situation, you might do something that could result in equipment damage
or loss of data.
Caution
Means the described action saves time. You can save time by performing the action described in the
paragraph.
Timesaver
Means reader be warned. In this situation, you might perform an action that could result in bodily
injury.
Warning
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
xx OL-29890-01
Preface
Document Conventions