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Implementing Routing Policy on Cisco IOS XR Software
Information About Implementing Routing Policy
RC-224
Cisco IOS XR Routing Configuration Guide
Note The protocol configuration rejects attempts to attach policies that perform unsupported operations.
The following sections describe the protocol attach points, including information on the attributes
(commands) and operations that are valid for each attach point.
• BGP Policy Attach Points, page RC-224
• OSPF Policy Attach Points, page RC-231
• OSPFv3 Policy Attach Points, page RC-232
• IS-IS Policy Attach Points, page RC-234
See the Cisco IOS XR Routing Command Reference for more information on the attributes and
operations.
BGP Policy Attach Points
This section describes each of the BGP policy attach points and provides a summary of the BGP
attributes and operators.
Aggregation
The aggregation attach point generates an aggregate route to be advertised based on the conditional
presence of subcomponents of that aggregate. Policies attached at this attach point are also able to set
any of the valid BGP attributes on the aggregated routes. For example, the policy could set a community
value or a MED on the aggregate that is generated. The specified aggregate is generated if any routes
evaluated by the named policy pass the policy. More specifics of the aggregate are filtered using the
suppress-route keyword. Any actions taken to set attributes in the route affect attributes on the
aggregate.
In the policy language, the configuration is controlled by which routes pass the policy. The suppress map
was used to selectively filter or suppress specific components of the aggregate when the summary-only
flag is not set. In other words, when the aggregate and more specific components are being sent, some
of the more specific components can be filtered using a suppress map. In the policy language, this is
controlled by selecting the route and setting the suppress flag. The attribute-map allowed the user to set
specific attributes on the aggregated route. In the policy language, setting attributes on the aggregated
route is controlled by normal action operations.
In the following example, the aggregate address 10.0.0.0/8 is generated if there are any component routes
in the range 10.0.0.0/8 ge 8 le 25 except for 10.2.0.0/24. Because summary-only is not set, all
components of the aggregate are advertised. However, the specific component 10.1.0.0 are suppressed.
route-policy sample
if destination in (10.0.0.0/8 ge 8 le 25) then
set community (10:33)
endif
if destination in (10.2.0.0/24) then
drop
endif
if destination in (10.1.0.0/24) then
suppress-route
endif
end-policy
- 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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