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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-96
Cisco IOS XR Routing Configuration Guide
Configuring the Route Distinguisher
The route distinguisher (RD) makes prefixes unique across multiple VPN routing and forwarding (VRF)
instances.
Perform this task to configure the RD.
SUMMARY STEPS
1. configure
2. router /jointfilesconvert/455219/bgp as-number
3. /jointfilesconvert/455219/bgp router-id ip-address
4. vrf vrf-name
5. rd {as-number:nn | ip-address:nn | auto}
6. end
or
commit
Step 8
export route-target [
as-number
:
nn
|
ip-address
:
nn
]
Example:
RP/0/RP0/CPU0:router(config-vrf-af)# export
route-target 123;234
Specifies a list of route target extended communities.
Export route target communities are associated with
prefixes when they are advertised to remote PEs. The
remote PEs import them into VRFs which have import RTs
that match these exported route target communities.
Step 9
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-vrf-af)# end
or
RP/0/RP0/CPU0:router(config-vrf-af)# commit
Saves configuration changes.
• When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting(yes/no/cancel)?
[cancel]:
–
Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
–
Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
–
Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
• Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Command or Action Purpose
- Text Part Number: OL-12285-01 1
- CONTENTS 3
- Contents 10
- Preface 13
- Release Modification 15
- BGP Functional Overview 17
- BGP Router Identifier 18
- BGP Default Limits 18
- BGP Next Hop Tracking 19
- Scoped IPv4/VPNv4 Table Walk 20
- BGP Configuration 21
- Configuration Modes 22
- Neighbor Submode 23
- Configuration Templates 24
- Template Inheritance Rules 25
- Template Inheritance 29
- No Default Address Family 33
- Routing Policy Enforcement 34
- Table Policy 35
- Update Groups 36
- BGP Cost Community 36
- BGP Best Path Algorithm 41
- Order of Comparisons 43
- Best Path Change Suppression 43
- Administrative Distance 44
- Figure 3 Back Door Example 45
- Multiprotocol BGP 46
- Route Dampening 47
- BGP Route Reflectors 48
- Distributed BGP 51
- BGP Keychains 53
- IPv6 Provider Edge Multipath 54
- IP L3VPN w/L2TPv3 55
- Service Provider 56
- Enabling BGP Routing 58
- Logging Neighbor Changes 63
- Adjusting BGP Timers 64
- Configuring BGP Weights 68
- 5. router bgp as-number 99
- DETAILED STEPS 100
- Example: 101
- SUMMARY STEPS 103
- Configuring Distributed BGP 105
- BGP Load Balancing 121
- Redistribution of IGPs to BGP 123
- Configuring Keychains for BGP 126
- Disabling a BGP Neighbor 130
- Monitoring BGP Update Groups 138
- Software 139
- BGP Confederation: Example 142
- BGP Route Reflector: Example 143
- Where to Go Next 144
- Additional References 145
- Technical Assistance 146
- EIGRP Functional Overview 149
- EIGRP Features 149
- EIGRP Components 150
- EIGRP Configuration Grouping 151
- EIGRP Configuration Modes 151
- EIGRP Interfaces 152
- Mismatched K Values 153
- The Goodbye Message 154
- 10.1.1.0/24 157
- Enabling EIGRP Routing 160
- Restrictions 162
- /length 164
- Monitoring EIGRP Routing 174
- Cisco IOS XR Software 177
- IS-IS Functional Overview 183
- IS-IS Configuration Grouping 184
- IS-IS Configuration Modes 184
- IS-IS Interfaces 185
- Multitopology Configuration 185
- Limit LSP Flooding 186
- Single-Topology IPv6 Support 187
- Multitopology IPv6 Support 187
- IS-IS Authentication 187
- Nonstop Forwarding 188
- Multi-Instance IS-IS 189
- Overload Bit on Router 189
- Default Routes 190
- IS-IS Support for Route Tags 190
- Multicast-Intact Feature 190
- MPLS TE Forwarding Adjacency 192
- MPLS TE Interarea Tunnels 193
- IP Fast Reroute 193
- Prerequisites 194
- Prerequisite 211
- Tuning Adjacencies for IS-IS 214
- Customizing Routes for IS-IS 219
- Enabling Multicast-Intact 224
- OSPF Routing Components 240
- Autonomous Systems 241
- Stub Area 242
- Not-so-Stubby Area 242
- Area Border Routers 242
- OSPF Process and Router ID 243
- Supported OSPF Network Types 243
- Plain Text Authentication 244
- MD5 Authentication 244
- Authentication Strategies 244
- Key Rollover 244
- Default Route for OSPF 245
- Route Redistribution for OSPF 248
- Graceful Restart for OSPFv3 250
- Helper Mode 251
- • draft-ietf-ospf-cap-09 255
- Enabling OSPF 256
- area-id 257
- seconds 270
- Examples 275
- DETAILED STEP 290
- Summary Steps 292
- ABR 1 Configuration 314
- ABR 2 Configuration 314
- Standards 316
- RIB Administrative Distance 319
- RIB Support for IPv4 and IPv6 320
- RIB Statistics 320
- RIB Quarantining 321
- How to Deploy and Monitor RIB 322
- Related Documents 329
- RIP Functional Overview 332
- Split Horizon for RIP 333
- Route Timers for RIP 333
- Route Redistribution for RIP 334
- Enabling RIP 336
- Customize RIP 337
- Control Routing Information 340
- Named Set Form 355
- Inline Set Form 355
- Routing Policy Language Usage 359
- Set community based on MED 360
- Persistent Remarks 360
- Policy Definitions 361
- Parameterization 362
- Global Parameterization 363
- Boolean Operator Precedence 364
- When Attributes Are Modified 365
- Default Drop Disposition 365
- Control Flow 366
- Policy Verification 366
- Attached Policy Modification 367
- Policy Statements 368
- Boolean Conditions 371
- Attach Points 372
- BGP Policy Attach Points 373
- Dampening 374
- Default Originate 375
- Neighbor Export 375
- Neighbor Import 376
- Redistribute 377
- Show BGP 377
- Retain Route-Target 380
- Allocate-Label 381
- Neighbor-ORF 381
- Next-hop 382
- Clear-Policy 382
- BGP Attributes and Operators 383
- OSPF Policy Attach Points 393
- Area-out 394
- OSPF Attributes and Operators 394
- OSPFv3 Policy Attach Points 395
- IS-IS Policy Attach Points 396
- Default-Information Originate 397
- Inter-area-propagate 397
- EIGRP Policy Attach Points 398
- Default-Accept-In 399
- Default-Accept-Out 399
- Policy-In 399
- Policy-Out 400
- If-Policy-In 400
- If-Policy-Out 400
- RIP Policy Attach Points 401
- Global-Inbound 402
- Global-Outbound 402
- Interface-Inbound 403
- Interface-Outbound 403
- RIP Attributes and Operators 403
- • Nano (default) 405
- Defining a Route Policy 407
- policy-name 410
- Directly Connected Routes 419
- Recursive Static Routes 420
- Floating Static Routes 421
- Default VRF 421
- Configuring a Static Route 422
- Configuration Examples 430
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