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OSPF Support for Unlimited Software VRFs per Provider Edge (PE) Router

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OSPF Support for Unlimited Software VRFs per Provider Edge Router

Contents

Prerequisites for OSPF Support for Unlimited Software VRFs per Provider Edge Router

Restrictions for OSPF Support for Unlimited Software VRFs per Provider Edge Router

Information About OSPF Support for Unlimited Software VRFs per Provider Edge Router

How to Configure the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Configuring and Verifying Unlimited Software VRFs per Provider Edge Router

Configuration Examples for the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Example: Configuring the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Example: Verifying the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

Glossary


OSPF Support for Unlimited Software VRFs per Provider Edge Router

In a Multiprotocol Label Switching—Virtual Private Network (MPLS-VPN) deployment, each VPN routing and forwarding instance (VRF) needs a separate Open Shortest Path First (OSPF) process when configured to run OSPF. The OSPF Support for Unlimited Software VRFs per Provider Edge Router feature addresses the scalability issue for OSPF VPNs by eliminating the OSPF VPN limit of 32 processes.

History for the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Release
Modification

12.3(4)T

This feature was introduced.

12.0(27)S

This feature was integrated into Cisco IOS Release 12.0(27)S.

12.2(25)S

This feature was integrated into Cisco IOS Release 12.2(25)S.

12.2(18)SXE

This feature was integrated into Cisco IOS Release 12.2(18)SXE.

12.2(27)SBC

This feature was integrated into Cisco IOS Release 12.2(27)SBC.


Finding Support Information for Platforms and Cisco IOS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.

Contents

•Prerequisites for OSPF Support for Unlimited Software VRFs per Provider Edge Router

•Restrictions for OSPF Support for Unlimited Software VRFs per Provider Edge Router

•Information About OSPF Support for Unlimited Software VRFs per Provider Edge Router

•How to Configure the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

•Configuration Examples for the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

•Additional References

•Command Reference

•Glossary

Prerequisites for OSPF Support for Unlimited Software VRFs per Provider Edge Router

You must have OSPF configured in your network.

Restrictions for OSPF Support for Unlimited Software VRFs per Provider Edge Router

Only 32 processes per VRF can be supported. For different VRF processes, there is no limit.

Information About OSPF Support for Unlimited Software VRFs per Provider Edge Router

Before Cisco IOS Releases 12.3(4)T and 12.0(27)S, a separate OSPF process was necessary for each VRF that receives VPN routes via OSPF. When VPNs are deployed, an MPLS Provider Edge (PE) router will be running both multiprotocol Border Gateway Protocol (BGP) for VPN distribution, and Interior Gateway Protocol (IGP) for PE-P connectivity. It is a common scenario when OSPF is used as the IGP between a customer edge (CE) router and a PE router. OSPF was not scalable in VPN deployment because of the limit of 32 processes. By default one process is used for connected routes and another process is used for static routes, therefore only 28 processes can be created for VRFs.

The OSPF Support for Unlimited Software VRFs per Provider Edge Router feature allows for an approximate range of 300 to 10,000 VRFs, depending on the particular platform and on the applications, processes, and protocols that are currently running on the platform.

How to Configure the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Configuring and Verifying Unlimited Software VRFs per Provider Edge Router

SUMMARY STEPS

1. enable

2. configure terminal

3. router ospf process-id [vrf vpn-name]

4. end

5. show ip ospf [process-id]

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

router ospf process-id [vrf vpn-name]

Example:

Router(config)# router ospf 1 vrf crf-1

Enables OSPF routing.

•The process-id argument identifies the OSPF process.

•Use the vrf keyword and vpn-name argument to identify a VPN.

Note You now can configure as many OSPF VRF processes as needed.

Step 4 

end

Example:

Router(config-router)# end

Returns to privileged EXEC mode.

Step 5 

show ip ospf [process-id]

Example:

Router# show ip ospf 1

Displays general information about OSPF routing processes.

Configuration Examples for the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

This section contains the following configuration examples:

•Example: Configuring the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

•Example: Verifying the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

Example: Configuring the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

This example shows a basic OSPF configuration using the router ospf command to configure OSPF VRF processes for the VRFs first, second, and third: 

Router> enable

Router# configure terminal

Router(config)# router ospf 12 vrf first

Router(config)# router ospf 13 vrf second

Router(config)# router ospf 14 vrf third

Router(config)# exit

Example: Verifying the OSPF Support for Unlimited Software VRFs per Provider Edge Router Feature

This example illustrates the output display from the show ip ospf command to verify that the OSPF VRF process 12 has been created for the VRF named first. The output that relates to the VRF first appears in bold. 

Router# show ip ospf 12


main ID type 0x0005, value 0.0.0.100

 Supports only single TOS(TOS0) routes

 Supports opaque LSA

 Supports Link-local Signaling (LLS)

 Supports area transit capability

 Connected to MPLS VPN Superbackbone, VRF first

 It is an area border router

 Initial SPF schedule delay 5000 msecs

 Minimum hold time between two consecutive SPFs 10000 msecs

 Maximum wait time between two consecutive SPFs 10000 msecs

 Incremental-SPF disabled

 Minimum LSA interval 5 secs

 Minimum LSA arrival 1000 msecs

 LSA group pacing timer 240 secs

 Interface flood pacing timer 33 msecs

 Retransmission pacing timer 66 msecs

 Number of external LSA 0. Checksum Sum 0x0

 Number of opaque AS LSA 0. Checksum Sum 0x0

 Number of DCbitless external and opaque AS LSA 0

 Number of DoNotAge external and opaque AS LSA 0

 Number of areas in this router is 1. 1 normal 0 stub 0 nssa

 Number of areas transit capable is 0

 External flood list length 0

    Area BACKBONE(0)

        Number of interfaces in this area is 1

        Area has no authentication

        SPF algorithm last executed 00:00:15.204 ago

        SPF algorithm executed 2 times

        Area ranges are

        Number of LSA 1. Checksum Sum 0xD9F3

        Number of opaque link LSA 0. Checksum Sum 0x0

        Number of DCbitless LSA 0

        Number of indication LSA 0

        Number of DoNotAge LSA 0

        Flood list length 0

Additional References

The following sections provide references related to the OSPF Support for Unlimited Software VRFs per Provider Edge Router feature.

Related Documents

Related Topic
Document Title

Configuring OSPF

Cisco IOS IP Routing: OSPF Configuration Guide


Standards

Standards
Title

None

—


MIBs

MIBs
MIBs Link

None

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFCs
Title

None

—


Technical Assistance

Description
Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html


Command Reference

This feature uses no new or modified commands.

Glossary

multiprotocol BGP—Border Gateway Protocol (BGP) can be used as an interdomain routing protocol in networks that use Connectionless Network Service (CLNS) as the network-layer protocol.

Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

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