Cisco Cisco IOS Software Release 12.2(14)S
BGP Conditional Route Injection
Supported Platforms
2
Cisco IOS Release 12.0(14)ST, 12.2(4)T, 12.2(14)S, and 12.0(22)S
The BGP Conditional Route Injection feature allows you to originate a prefix into a BGP routing table
without the corresponding match. This feature allows more specific routes to be generated based on
administrative policy or traffic engineering information in order to provide more specific control over
the forwarding of packets to these more specific routes, which are injected into the BGP routing table
only if the configured conditions are met. Enabling this feature will allow you to improve the accuracy
of common route aggregation by conditionally injecting or replacing less specific prefixes with more
specific prefixes. Only prefixes that are equal to or more specific than the original prefix may be injected.
The BGP Conditional Route Injection feature is enabled with the bgp inject-map exist-map command.
This command uses two route maps (inject-map and exist-map) to install one (or more) more specific
prefix into a BGP routing table. The exist-map specifies the prefixes that the BGP speaker will track.
The inject-map defines the prefixes that will be created and installed into the local BGP table.
without the corresponding match. This feature allows more specific routes to be generated based on
administrative policy or traffic engineering information in order to provide more specific control over
the forwarding of packets to these more specific routes, which are injected into the BGP routing table
only if the configured conditions are met. Enabling this feature will allow you to improve the accuracy
of common route aggregation by conditionally injecting or replacing less specific prefixes with more
specific prefixes. Only prefixes that are equal to or more specific than the original prefix may be injected.
The BGP Conditional Route Injection feature is enabled with the bgp inject-map exist-map command.
This command uses two route maps (inject-map and exist-map) to install one (or more) more specific
prefix into a BGP routing table. The exist-map specifies the prefixes that the BGP speaker will track.
The inject-map defines the prefixes that will be created and installed into the local BGP table.
Benefits
The BGP Conditional Route Injection feature allows you to inject more specific prefixes into a BGP
routing table over less specific prefixes that were selected through normal route aggregation. These more
specific prefixes can be used to provide a finer granularity of traffic engineering or administrative control
than is possible with aggregated routes.
routing table over less specific prefixes that were selected through normal route aggregation. These more
specific prefixes can be used to provide a finer granularity of traffic engineering or administrative control
than is possible with aggregated routes.
Related Features and Technologies
The BGP Conditional Route Injection feature is an extension of the BGP routing protocol. For more
information about configuring BGP, conditional advertisement, route summarization and route filtering,
refer to the “Configuring BGP” chapter of the Release 12.2 Cisco IOS IP Configuration Guide and the
Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols.
information about configuring BGP, conditional advertisement, route summarization and route filtering,
refer to the “Configuring BGP” chapter of the Release 12.2 Cisco IOS IP Configuration Guide and the
Cisco IOS IP Command Reference, Volume 2 of 3: Routing Protocols.
Supported Platforms
The BGP Conditional Route Injection feature is supported by all platforms in Cisco IOS
Release 12.2(14)S that support BGP:
Release 12.2(14)S that support BGP:
•
Cisco 7200 series
•
Cisco 7400 series
•
Cisco 7500 series
Determining Platform Support Through Cisco Feature Navigator
Cisco IOS software is packaged in feature sets that support specific platforms. To get updated
information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature
Navigator dynamically updates the list of supported platforms as new platform support is added for the
feature.
information regarding platform support for this feature, access Cisco Feature Navigator. Cisco Feature
Navigator dynamically updates the list of supported platforms as new platform support is added for the
feature.
Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software
images support a specific set of features and which features are supported in a specific Cisco IOS image.
You can search by feature or release. Under the release section, you can compare releases side by side
to display both the features unique to each software release and the features in common.
images support a specific set of features and which features are supported in a specific Cisco IOS image.
You can search by feature or release. Under the release section, you can compare releases side by side
to display both the features unique to each software release and the features in common.