Cisco IOS XE IP Routing Protocols Configuration Guide, Release 2 - OSPF Support for Multi-VRF on CE Routers [Cisco IOS XE Software]

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

Benefits of OSPF Multi-VRF Support

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 Example for OSPF Support for Multi-VRF on CE Routers

Configuring the Multi-VRF Capability: Example

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: May 4, 2009

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.

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

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 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

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

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

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

•Additional References

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

•Glossary

Information About OSPF Support for Multi-VRF on CE Routers

Before you configure OSPF support for multi-VRF on CE routers, you should understand the following concept:

•Benefits of OSPF Multi-VRF Support

Benefits of OSPF Multi-VRF Support

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.

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

This section describes how to configure the multi-VRF for OSPF routing. This task assumes that you have already configured a VRF. For a complete VRF configuration example, see the "Configuring the Multi-VRF Capability: Example" section.

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

vpdn-group name
Example:

Router(config)# vpdn-group mygroup

Creates a VPDN group.

Step 5

exit
Example:

Router(config-vpdn)# exit

Leaves the configuration mode and returns to global configuration mode.

Step 6

resource-pool profile vpdn name
Example:

Router(config)# resource-pool profile vpdn company1

Creates a virtual private dialup network (VPDN) profile and enters VPDN profile configuration mode.

Step 7

vpdn group name
Example:

Router(config-vpdn-profile)# vpdn group mygroup

Associates a virtual private dialup network (VPDN) group with a customer or VPDN profile.

Step 8

vpn {vrfvrf-name | idvpn-id}
Example:

Router(config-vpdn)# vpn vrf grc

Specifies that the source and destination IPv4 addresses of a given virtual private dialup network (VPDN) group belong to a specified Virtual Private Network (VPN) routing and forwarding (VRF) instance.

Step 9

exit
Example:

Router(config-vpdn)# exit

Leaves the configuration mode and returns to global configuration mode.

Step 10

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 11

capability vrf-lite
Example:

Router(config-router)# 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 172.16.1.1 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 Example for OSPF Support for Multi-VRF on CE Routers

This section provides the following configuration example:

•Configuring the Multi-VRF Capability: Example

Configuring the Multi-VRF Capability: Example

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 Serial2/0/0
 ip vrf forwarding grc
 ip address 192.168.1.1 255.255.255.252
!
interface Serial3/0/0
 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, Serial2/0/0
                      [110/138] via 192.168.1.9, 00:06:08, Serial3/0/0
O IA 192.168.242.0/24 [110/74] via 192.168.1.13, 00:06:08, Serial2/0/0
O IA 192.168.193.0/24 [110/148] via 192.168.1.13, 00:06:08, Serial2/0/0
                      [110/148] via 192.168.1.9, 00:06:08, Serial3/0/0
O IA 192.168.128.0/24 [110/74] via 192.168.1.9, 00:06:08, Serial3/0/0
O IA 192.168.129.0/24 [110/84] via 192.168.1.9, 00:06:08, Serial3/0/0
O IA 192.168.130.0/24 [110/84] via 192.168.1.9, 00:06:08, Serial3/0/0
     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, Serial2/0/0
O E2    172.16.10.0 [110/5] via 192.168.1.13, 00:06:08, Serial2/0/0
O IA 192.168.131.0/24 [110/94] via 192.168.1.9, 00:06:20, Serial3/0/0
     192.168.1.0/30 is subnetted, 4 subnets
C       192.168.1.8 is directly connected, Serial3/0/0
C       192.168.1.12 is directly connected, Serial2/0/0
O       192.168.1.0 [110/128] via 192.168.1.9, 00:06:20, Serial3/0/0
O       192.168.1.4 [110/128] via 192.168.1.13, 00:06:20, Serial2/0/0
Additional References

For additional information related to OSPF support for multi-VRF on CE routers, see the following references.

Related Documents

Related Topic

Document Title

Configuring OSPF

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

Multiprotocol Label Switching (MPLS)

Cisco IOS XE Multiprotocol Label Switching Configuration Guide, Release 2

OSPF commands

Cisco IOS IP Routing Protocols Command Reference

Cisco IOS master command list, all releases

Cisco IOS Master Command List, All Releases

Standards

Standard

Title

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

—

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

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

RFCs

RFC

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 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 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 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 Multi-VRF on CE Routers

Feature Name

Releases

Feature Information

OSPF Support for Multi-VRF on CE Routers

Cisco IOS XE
Release 2.1

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.

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