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Implementing BGP on Cisco IOS XR Software
How to Implement BGP on Cisco IOS XR Software
RC-39
Cisco IOS XR Routing Configuration Guide
Tuning the BGP Best Path Calculation
Perform this task to change the default BGP best path calculation behavior.
SUMMARY STEPS
1. configure
2. router /jointfilesconvert/86220/bgp autonomous-system-number
3. /jointfilesconvert/86220/bgp bestpath med missing-as-worst
4. /jointfilesconvert/86220/bgp bestpath med always
5. /jointfilesconvert/86220/bgp bestpath med confed
6. /jointfilesconvert/86220/bgp bestpath as-path ignore
7. /jointfilesconvert/86220/bgp bestpath compare-routerid
Step 5
address-family {ipv4 unicast | ipv4 multicast |
ipv6 unicast | ipv6 multicast}
Example:
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr)#
address-family ipv4 unicast
Enters neighbor address family configuration mode for the
IPv4 address family.
Step 6
weight
weight-value
Example:
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr-af)# weight
41150
Assigns a weight of 41150 to all IPv4 unicast routes learned
through 172.168.40.24.
Step 7
end
or
commit
Example:
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr-af)# end
or
RP/0/RP0/CPU0:router(config-/jointfilesconvert/86220/bgp-nbr-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-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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