Configuration Tasks

At a minimum, perform the following tasks on each PE router to configure them for OSPF. For other OSPF configuration tasks, see OSPF Configuration Tasks in the JUNOSe IP, IPv6, and IGP Configuration Guide.

1. Create the VRF.

   host1(config)#ip vrf ospf2

   Proceed with new VRF creation? [confirm]

   host1(config-vrf)#rd 100:85

   host1(config-vrf)#exit

2. Start OSPF on the VRF, either from the parent VR or directly from the VRF.

   From the parent VR:

   host1(config)#router ospf 5 vrf ospf2

   From the VRF:

   host1(config)#virtual-router :ospf2

   host1:default:ospf2(config)#router ospf 5

   The command prompts in the remaining steps reflect using the latter method for starting OSPF.

3. Configure the OSPF domain ID.

   host1:default:ospf2(config-router)#domain-id 45

4. Configure the VPN route tag.

   host1:default:ospf2(config-router)#domain-tag 1200

5. Redistribute routes learned from other PE routers back into OSPF.

   host1:default:ospf2(config-router)#redistribute bgp

6. Create an address family in BGP.

   host1:default(config)#router bgp 100

   host1:default(config-router)#address-family ipv4 unicast vrf ospf2

7. Redistribute OSPF routes into BGP.

   host1:default(config-router)#redistribute ospf

domain-id

• Use to set the OSPF domain ID for an OSPF VRF on a PE router; the default value is zero.
• Use the same domain ID for all OSPF VRFs in a given OSPF domain.
• When the value is zero, MP-BGP does not attach an OSPF domain identifier attribute when it converts an OSPF route to an MP-BGP route to cross the BGP/MPLS VPN.
• Example

  host1:default:ospf2(config-router)#domain-id 45

• Use the no version to restore the default value.
• See domain-id.

domain-tag

• Use to set the VPN route tag for an OSPF VRF on a PE router.
• The default value is a 32-bit number based on the AS number of the BGP/MPLS VPN backbone, with the first 16 bits set to 1110 0000 0000 0000, followed by the 16 bits representing the AS number.
• Example

  host1:default:ospf2(config-router)#domain-tag 1200

• Use the no version to restore the default value.
• See domain-tag.

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