Cisco IOS XE IP Routing Protocols Configuration Guide, Release 2 - OSPF Support for Unlimited Software VRFs per Provider Edge (PE) Router [Cisco IOS XE Software]

Table Of Contents

OSPF Support for Unlimited Software VRFs per Provider Edge Router

Finding Feature Information

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

Benefits of Having Unlimited Software VRFs per Provider Edge Router

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

Configuring and Verifying Unlimited Software VRFs per Provider Edge Router

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

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

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

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

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

Glossary

OSPF Support for Unlimited Software VRFs per Provider Edge Router

Last Updated: May 4, 2009

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.

Finding Feature Information

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 Support for Unlimited Software VRFs per Provider Edge Router" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

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 OSPF Support for Unlimited Software VRFs per Provider Edge Router

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

•Additional References

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

•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 you configure the OSPF Support for Unlimited Software VRFs per Provider Edge Router feature, you should understand the following concept:

•Benefits of Having Unlimited Software VRFs per Provider Edge Router

Benefits of Having 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. OSPF is commonly used as the IGP between a customer edge (CE) router and a PE router. OSPF was not scalable in a 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 OSPF Support for Unlimited Software VRFs per Provider Edge Router

This section contains the following procedure:

•Configuring and Verifying Unlimited Software VRFs per Provider Edge Router

Configuring and Verifying Unlimited Software VRFs per Provider Edge Router

This task describes how to configure and verify unlimited software VRFs for OSPF routing.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip vrf vpn-name

4. exit

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

6. end

7. 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

ip vrf vpn-name
Example:

Router(config)# ip vrf crf-1

Defines a VPN routing and forwarding (VRF) instance and enters VRP configuration mode.

Step 4

exit
Example:

Router(config-vrf)# exit

Returns to global configuration mode.

Step 5

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 the VPN already defined in Step 3.

Note You can now configure as many OSPF VRF processes as needed. Repeat Steps 3-5 as needed.

Step 6

end
Example:

Router(config-router)# end

Returns to privileged EXEC mode.

Step 7

show ip ospf [process-id]
Example:

Router# show ip ospf 1

Displays general information about OSPF routing processes.

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

This section contains the following configuration examples:

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

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

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

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)# ip vrf first
Router(config-vrf)# exit
Router(config)# ip vrf second
Router(config-vrf)# exit
Router(config)# ip vrf third
Router(config-vrf)# exit
Router(config)# router ospf 12 vrf first
Router(config-router)# exit
Router(config)# router ospf 13 vrf second
Router(config-router)# exit
Router(config)# router ospf 14 vrf third
Router(config)# end
Verifying OSPF Support for Unlimited Software VRFs per Provider Edge Router: Example

This example illustrates the output from the show ip ospf command to verify that 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

"Configuring OSPF" chapter in the Cisco IOS XE IP Routing Protocols Configuration Guide, Release 2

Standards

Standard

Title

None

—

MIBs

MIB

MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

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

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

RFCs

RFC

Title

None

—

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/techsupport

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

Table 1 lists the release history for this feature.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS XE 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 Cisco IOS XE software release that introduced support for a given feature in a given Cisco IOS XE software release train. Unless noted otherwise, subsequent releases of that Cisco IOS XE software release train also support that feature.

Table 1 Feature Information for OSPF Support for Unlimited Software VRFs per Provider Edge Router

Feature Name

Releases

Feature Information

OSPF Support for Unlimited Software VRFs per Provider Edge Router

Cisco IOS XE
Release 2.1

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.

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.

CCDE, CCSI, CCENT, Cisco Eos, Cisco HealthPresence, the Cisco logo, Cisco Lumin, Cisco Nexus, Cisco Nurse Connect, Cisco Stackpower, Cisco StadiumVision, Cisco TelePresence, Cisco WebEx, DCE, and Welcome to the Human Network are trademarks; Changing the Way We Work, Live, Play, and Learn and Cisco Store are service marks; and Access Registrar, Aironet, AsyncOS, Bringing the Meeting To You, Catalyst, CCDA, CCDP, CCIE, CCIP, CCNA, CCNP, CCSP, CCVP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, Collaboration Without Limitation, EtherFast, EtherSwitch, Event Center, Fast Step, Follow Me Browsing, FormShare, GigaDrive, HomeLink, Internet Quotient, IOS, iPhone, iQuick Study, IronPort, the IronPort logo, LightStream, Linksys, MediaTone, MeetingPlace, MeetingPlace Chime Sound, MGX, Networkers, Networking Academy, Network Registrar, PCNow, PIX, PowerPanels, ProConnect, ScriptShare, SenderBase, SMARTnet, Spectrum Expert, StackWise, The Fastest Way to Increase Your Internet Quotient, TransPath, WebEx, and the WebEx logo are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the United States and certain other countries.

All other trademarks mentioned in this document or website 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. (0903R)

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, and 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.

© 2009 Cisco Systems, Inc. All rights reserved.