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Table Of Contents

OSPF Support for Multi-VRF on CE Routers

Finding Feature Information

Contents

Information About OSPF Support for Multi-VRF on CE Routers

How to Configure OSPF Support for Multi-VRF on CE Routers

Configuring the Multi-VRF Capability for OSPF Routing

Prerequisites

Verifying the OSPF Multi-VRF Configuration

Configuration Examples for OSPF Support for Multi-VRF on CE Routers

Example: Configuring the Multi-VRF Capability

Example: Verifying the OSPF Multi-VRF Configuration

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for OSPF Support for Multi-VRF on CE Routers

Glossary


OSPF Support for Multi-VRF on CE Routers

Last Updated: September 10, 2010

The OSPF Support for Multi-VRF on CE Routers feature provides the capability of suppressing provider edge (PE) checks that are needed to prevent loops when the PE is performing a mutual redistribution of packets between the OSPF and BGP protocols. When VPN routing and forward (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.

OSPF multi-VRF allows you to split the router into multiple virtual routers, where each router contains its own set of interfaces, routing table, and forwarding table.

Finding Feature Information

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 Support for Multi-VRF on CE Routers" section.

Use Cisco Feature Navigator to find information about platform support and Cisco 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

•Information About OSPF Support for Multi-VRF on CE Routers

•How to Configure OSPF Support for Multi-VRF on CE Routers

•Configuration Examples for OSPF Support for Multi-VRF on CE Routers

•Additional References

•Glossary

Information About OSPF Support for Multi-VRF on CE Routers

The OSPF Support for Multi-VRF on CE Routers feature provides the capability of suppressing provider edge (PE) checks that are needed to prevent loops when the PE is performing a mutual redistribution of packets between the OSPF and BGP protocols. When VPN routing and forward (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.

OSPF multi-VRF allows you to split the router into multiple virtual routers, where each router contains its own set of interfaces, routing table, and forwarding table. OSPF multi-VRF gives you the ability to segment parts of your network and configure those segments to perform specific functions, yet still maintain correct routing information.

How to Configure OSPF Support for Multi-VRF on CE Routers

This section contains the following procedures:

•Configuring the Multi-VRF Capability for OSPF Routing

•Verifying the OSPF Multi-VRF Configuration

Configuring the Multi-VRF Capability for OSPF Routing

Prerequisites

CEF must be running on the network.

SUMMARY STEPS

1. enable

2. show ip ospf [process-id]

3. configure terminal

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

5. capability vrf-lite

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables higher privilege levels, such as privileged EXEC mode.

•Enter your password if prompted.

Step 2 

show ip ospf [process-id]

Example:

Router> show ip ospf 1

Displays the status of the router. If the display indicates that the router is connected to the VPN backbone, you can use the capability vrf-lite command to decouple the PE router from the VPN backbone.

Step 3 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 4 

router ospf process-id [vrf vpn-name]

Example:

Router(config)# router ospf 1 vrf grc

Enables OSPF routing and enters router configuration mode.

•The process-id argument identifies the OSPF process.

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

Step 5 

capability vrf-lite

Example:

Router(config)# capability vrf-lite

Applies the multi-VRF capability to the OSPF process.

Verifying the OSPF Multi-VRF Configuration

No specific debug or show commands are associated with this feature. You can verify the success of the OSPF multi-VRF configuration by using the show ip ospf [process-id] command to verify that the router is not connected to the VPN backbone.

This output from the show ip ospf process command indicates that the PE router is currently connected to the backbone. 

Router# show ip ospf 12


 Routing Process "ospf 12" with ID 151.1.1.1 and Domain ID 0.0.0.12

 Supports only single TOS(TOS0) routes

 Supports opaque LSA

 Connected to MPLS VPN Superbackbone

 SPF schedule delay 5 secs, Hold time between two SPFs 10 secs

 Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs

 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 0. 0 normal 0 stub 0 nssa

 External flood list length 0

When the OSPF VRF process is configured with the capability vrf-lite command under the router ospf command, the "Connected to MPLS VPN Superbackbone" line will not be present in the display.

Configuration Examples for OSPF Support for Multi-VRF on CE Routers

This section provides the following configuration examples:

•Example: Configuring the Multi-VRF Capability

•Example: Verifying the OSPF Multi-VRF Configuration

Example: Configuring the Multi-VRF Capability

This example shows a basic OSPF network with a VRF named grc configured. The capability vrf-lite command is entered to suppress the PE checks. 

!

ip cef

ip vrf grc

   rd 1:1


interface Serial2/0

  ip vrf forwarding grc

  ip address 192.168.1.1 255.255.255.252

!

interface Serial3/0

  ip vrf forwarding grc

  ip address 192.168.2.1 255.255.255.252

...


!

router ospf 9000 vrf grc

  log-adjacency-changes

  capability vrf-lite

  redistribute rip metric 1 subnets

  network 192.168.1.0 0.0.0.255 area 0

!

router rip

  address-family ipv4 vrf grc

  redistribute ospf 9000 vrf grc

  network network 192.168.2.0

  no auto-summary

  end


Router# show ip route vrf grc


Routing Table: grc

Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route


Gateway of last resort is not set


O IA 192.168.192.0/24 [110/138] via 192.168.1.13, 00:06:08, Serial2/0

                      [110/138] via 192.168.1.9, 00:06:08, Serial3/0

O IA 192.168.242.0/24 [110/74] via 192.168.1.13, 00:06:08, Serial2/0

O IA 192.168.193.0/24 [110/148] via 192.168.1.13, 00:06:08, Serial2/0

                      [110/148] via 192.168.1.9, 00:06:08, Serial3/0

O IA 192.168.128.0/24 [110/74] via 192.168.1.9, 00:06:08, Serial3/0

O IA 192.168.129.0/24 [110/84] via 192.168.1.9, 00:06:08, Serial3/0

O IA 192.168.130.0/24 [110/84] via 192.168.1.9, 00:06:08, Serial3/0

     172.16.0.0/24 is subnetted, 2 subnets

O E2    172.16.9.0 [110/5] via 192.168.1.13, 00:06:08, Serial2/0

O E2    172.16.10.0 [110/5] via 192.168.1.13, 00:06:08, Serial2/0

O IA 192.168.131.0/24 [110/94] via 192.168.1.9, 00:06:20, Serial3/0

     192.168.1.0/30 is subnetted, 4 subnets

C       192.168.1.8 is directly connected, Serial3/0

C       192.168.1.12 is directly connected, Serial2/0

O       192.168.1.0 [110/128] via 192.168.1.9, 00:06:20, Serial3/0

O       192.168.1.4 [110/128] via 192.168.1.13, 00:06:20, Serial2/0

Example: Verifying the OSPF Multi-VRF Configuration

This example illustrates the output display from the show ip ospf process command after OSPF multi-VRF has been configured on the router. 

Router# show ip ospf database external 172.16.0.0 self


            OSPF Router with ID (10.0.0.1) (Process ID 100)


                 Type-5 AS External Link States


   LS age: 175

   Options: (No TOS-capability, DC)

   LS Type: AS External Link

   Link State ID: 172.16.0.0 (External Network Number )

   Advertising Router: 10.0.0.1

   LS Seq Number: 80000001

   Checksum: 0xEA9E

   Length: 36

   Network Mask: /8

         Metric Type: 2 (Larger than any link state path)

         MTID: 0

         Metric: 20

         Forward Address: 0.0.0.0

         External Route Tag: 0

Additional References

Related Documents

Related Topic
Document Title

Configuring OSPF

Configuring OSPF

Multiprotocol Label Switching (MPLS)

MPLS Multi-VRF (VRF Lite) Support


Standards

Standards
Title

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

—


MIBs

MIBs
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 software releases, and feature sets, use Cisco MIB Locator found at the following URL:

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


RFCs

RFCs
Title

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

—


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


Feature Information for OSPF Support for Multi-VRF on CE Routers

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 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.

Table 1 Feature Information for OSPF Support for Multi-VRF on CE Routers

Feature Name
Releases
Feature Information

OSPF Support for Multi-VRF on CE Routers

12.0(21)ST
12.0(22)S
12.2(8)B
12.2(13)T
12.2(14)S
Cisco IOS XE 3.1.0 SG

The OSPF Support for Multi-VRF on CE Routers feature provides the capability to suppress provider edge (PE) checks that are needed to prevent loops when the PE is performing a mutual redistribution of packets between the OSPF and BGP protocols. When VPN routing and forwarding (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.

The following commands are introduced or modified in the feature documented in this module:

•capability vrf-lite


Glossary

CE Router—Customer Edge router, an edge router in the C network, defined as a C router which attaches directly to a P router.

C Network—Customer (enterprise or service provider) network.

C Router—Customer router, a router in the C network.

LSA—link-state advertisement. Broadcast packet used by link-state protocols that contains information about neighbors and path costs. LSAs are used by the receiving routers to maintain their routing tables.

PE Router—Provider Edge router, an edge router in the P network, defined as a P router which attaches directly to a C router.

P Network—MPLS-capable service provider core network. P routers perform MPLS.

P Router—Provider router, a router in the P network.

VRF—VPN Routing and Forwarding.

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.

© 2011 Cisco Systems, Inc. All rights reserved.