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Implementing BGP on Cisco IOS XR Software
Information About Implementing BGP on Cisco IOS XR Software
RC-9
Cisco IOS XR Routing Configuration Guide
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-vrf)# neighbor 11.0.1.2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-vrf-nbr)#
VRF Neighbor Address Family Configuration Mode
The following example shows how to enter VRF neighbor address family configuration mode:
RP/0/RP0/CPU0:router(config)# router /jointfilesconvert/455219/bgp 112
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp)# vrf vrf_A
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-vrf)# neighbor 11.0.1.2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-vrf-nbr)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-vrf-nbr-af)#
VPNv4 Address Family Configuration Mode
The following example shows how to enter VPNv4 address family configuration mode:
RP/0/RP0/CPU0:router(config)# router /jointfilesconvert/455219/bgp 152
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp)# address-family vpnv4 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-af)#
VPNv6 Address Family Configuration Mode
The following example shows how to enter VPNv6 address family configuration mode:
RP/0/RP0/CPU0:router(config)# router /jointfilesconvert/455219/bgp 150
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp)# address-family vpnv6 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-af)#
Neighbor Submode
Cisco IOS XR BGP uses a neighbor submode to make it possible to enter configurations without having
to prefix every configuration with the neighbor keyword and the neighbor address:
• Cisco IOS XR software has a submode available for neighbors in which it is not necessary for every
command to have a “neighbor x.x.x.x” prefix:
In Cisco IOS XR software, the configuration is as follows:
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp)# neighbor 192.23.1.2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr)# remote-as 2002
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr)# address-family ipv4 multicast
• An address family configuration submode inside the neighbor configuration submode is available
for entering address family-specific neighbor configurations. In Cisco IOS XR, the configuration is
as follows:
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp)# neighbor 2002::2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr)# remote-as 2023
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr)# address-family ipv6 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr-af)# next-hop-self
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr-af)# route-policy one in
• You must enter neighbor-specific IPv4, IPv6, VPNv4, or VPNv6 commands in neighbor
address-family configuration submode. In Cisco IOS XR software, the configuration is as follows:
RP/0/RP0/CPU0:router(config)# router /jointfilesconvert/455219/bgp 109
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp)# neighbor 192.168.40.24
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr)# remote-as 1
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/455219/bgp-nbr-af)# maximum-prefix 1000
- 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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