Table Of Contents
OSPF Area Transit Capability
First Published: January 27, 2004Last Updated: September 10, 2010
The OSPF Area Transit Capability feature provides an OSPF Area Border Router (ABR) with the ability to discover shorter paths through the transit area for forwarding traffic that would normally need to travel through the virtual-link path. This functionality allows Cisco IOS software to be compliant with RFC 2328.
Finding Feature Information in This Module
Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for OSPF Area Transit Capability" section.
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Information About OSPF Area Transit Capability
The OSPF Area Transit Capability feature is enabled by default. RFC 2328 defines OSPF area transit capability as the ability of the area to carry data traffic that neither originates nor terminates in the area itself. This capability enables the OSPF ABR to discover shorter paths through the transit area and forward traffic along those paths rather than using the virtual link or path, which are not as optimal.
For a detailed description of OSPF area transit capability, see RFC 2328, OSPF Version 2, at the following URL:
How to Disable OSPF Area Transit Capability
Disabling OSPF Area Transit Capability on an Area Border Router
This task describes how to disable the OSPF Area Transit Capability feature on an OSPF ABR.
2. configure terminal
3. router ospf process-id [vrf vpn-name]
4. no capability transit
Related Topic Document Title
"Configuring OSPF" module
MIB MIBs Link
To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:
Feature Information for OSPF Area Transit Capability
Table 1 lists the release history for this feature.
Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 1 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Note Software images for Cisco 12000 series Internet routers have been deferred to Cisco IOS Release 12.0(27)S1.
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