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Implementing BGP on Cisco IOS XR Software
Information About Implementing BGP on Cisco IOS XR Software
RC-11
Cisco IOS XR Routing Configuration Guide
Last reset 00:00:25, due to BGP neighbor initialized
External BGP neighbor not directly connected.
The inheritance rules used when groups are inheriting configuration from other groups are the same
as the rules given for neighbors inheriting from groups.
Template Inheritance
You can use the following show commands described to monitor BGP inheritance information:
• show /jointfilesconvert/86220/bgp neighbors, page RC-11
• show /jointfilesconvert/86220/bgp af-group, page RC-12
• show /jointfilesconvert/86220/bgp session-group, page RC-13
• show /jointfilesconvert/86220/bgp neighbor-group, page RC-14
show /jointfilesconvert/86220/bgp neighbors
Use the show /jointfilesconvert/86220/bgp neighbors command to display information about the BGP configuration for
neighbors.
• Use the configuration keyword to display the effective configuration for the neighbor, including any
settings that have been inherited from session groups, neighbor groups, or address family groups
used by this neighbor.
• Use the inheritance keyword to display the session groups, neighbor groups, and address family
groups from which this neighbor is capable of inheriting configuration .
The show /jointfilesconvert/86220/bgp neighbors command examples that follow are based on the sample configuration:
RP/0/RP0/CPU0:router(config)# router /jointfilesconvert/86220/bgp 140
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp)# af-group GROUP_3 address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-afgrp)# next-hop-self
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-afgrp)# route-policy POLICY_1 in
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp0afgrp)# exit
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp)# session-group GROUP_2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-sngrp)# advertisement-interval 15
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-sngrp)# exit
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp)# neighbor-group GROUP_1
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp)# use session-group GROUP_2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp)# e/jointfilesconvert/86220/bgp-multihop 3
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp-af)# weight 100
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp-af)# send-community-e/jointfilesconvert/86220/bgp
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp-af)# exit
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp)# address-family ipv4 multicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp-af)# default-originate
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp-af)# exit
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbrgrp)# exit
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp)# neighbor 192.168.0.1
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr)# remote-as 2
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr)# use neighbor-group GROUP_1
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr)# address-family ipv4 unicast
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr-af)# use af-group GROUP_3
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr-af)# weight 200
- Text Part Number: OL-5554-05 1
- CONTENTS 3
- Contents 10
- Preface 11
- Obtaining Documentation 12
- Documentation Feedback 13
- Submitting a Service Request 15
- BGP Functional Overview 18
- BGP Router Identifier 19
- BGP Default Limits 19
- BGP Configuration 20
- Neighbor Submode 21
- Configuration Templates 22
- Template Inheritance Rules 23
- Template Inheritance 27
- No Default Address Family 31
- Routing Policy Enforcement 32
- Update Groups 34
- BGP Best Path Algorithm 34
- Comparing Pairs of Paths 35
- Order of Comparisons 36
- Multiprotocol BGP 37
- Route Dampening 39
- BGP Route Reflectors 40
- Enabling BGP Routing 44
- Logging Neighbor Changes 50
- Adjusting BGP Timers 50
- Configuring BGP Weights 54
- Configuring a BGP Neighbor 74
- Disabling a BGP Neighbor 85
- Monitoring BGP Update Groups 91
- BGP Confederation: Example 94
- IS-IS Functional Overview 101
- IS-IS Configuration Grouping 101
- IS-IS Interfaces 102
- Multitopology Configuration 102
- Limit LSP Flooding 102
- Single-Topology IPv6 Support 103
- Nonstop Forwarding 104
- Multitopology IPv6 Support 104
- Multi-Instance IS-IS 105
- Overload Bit on Router 105
- Default Routes 106
- Multicast-Intact Feature 106
- Prerequisites 107
- DETAILED STEPS 108
- Restrictions 109
- SUMMARY STEPS 110
- Example: 113
- Example:: 117
- Prerequisite 126
- Summary Steps 134
- Customizing Routes for IS-IS 135
- Software 138
- Where to Go Next 140
- Additional References 140
- Technical Assistance 141
- OSPF Functional Overview 145
- OSPF Routing Components 148
- Backbone Area 149
- Stub Area 149
- Not-so-Stubby Area (NSSA) 149
- OSPF Process and Router ID 150
- Supported OSPF Network Types 151
- Authentication Strategies 152
- Key Rollover 152
- Default Route for OSPF 153
- Route Redistribution for OSPF 155
- Graceful Restart for OSPFv3 157
- Restart Mode 158
- Enabling OSPF 161
- Examples 180
- address mask 185
- Enabling Graceful Restart 198
- ABR 1 Configuration 207
- ABR 2 Configuration 207
- Cisco IOS XR Software 211
- Overview of RIB 212
- RIB Administrative Distance 213
- RIB Support for IPv4 and IPv6 213
- How to Deploy and Monitor RIB 214
- Routing Policy Language 222
- Named Set Form 224
- Inline Set Form 224
- Named Form 225
- Inline Form 226
- Routing Policy Language Usage 227
- Set community based on MED 228
- Policy Definitions 229
- Parameterization 230
- Boolean Operator Precedence 231
- When Attributes Are Modified 232
- Default Drop Disposition 233
- Control Flow 233
- Policy Verification 234
- Policy Statements 235
- Disposition 236
- Boolean Conditions 238
- Attach Points 239
- BGP Policy Attach Points 240
- Dampening 241
- Default Originate 241
- Neighbor Export 242
- Neighbor Import 242
- Redistribute 243
- Show bgp 244
- Table Policy 245
- BGP Attributes and Operators 245
- OSPF Policy Attach Points 247
- OSPFv3 Policy Attach Points 248
- IS-IS Policy Attach Points 250
- Attached Policy Modification 251
- Defining a Route Policy 253
- policy-name 256
- Directly Connected Routes 265
- Recursive Static Routes 265
- Floating Static Routes 266
- Configuring a Static Route 266
- Configuration Examples 271
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