Brocade Communications Systems ICX 7250 series, Configuration Manual

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OSPFv2 over VRF
OSPFv2 can run over multiple Virtual Routing and Forwarding (VRF) instances. All OSPFv2 commands are available over default and
non-default OSPF instances.
OSPFv2 maintains multiple instances of the routing protocol to exchange route information among various VRF instances. A multi-VRF-
capable device maps an input interface to a unique VRF, based on user configuration. These input interfaces can be physical or a
switched virtual interface (SVI). By default, all input interfaces are attached to the default VRF instance.
Multi-VRF for OSPF (also known as VRF-Lite for OSPF) provides a reliable mechanism for trusted VPNs to be built over a shared
infrastructure. The ability to maintain multiple virtual routing or forwarding tables allows overlapping private IP addresses to be maintained
across VPNs. For details and a configuration example, refer to
Multi-VRF for OSPF in the Multi-VRF chapter.
Configuring OSPFv2
Consider the topics discussed below when configuring OSPFv2.
Enabling OSPFv2
A number of steps are required when enabling OSPFv2 on a device.
Consider the following when enabling OSPFv2 on a device.
• If a device is to operate as an ASBR, you must enable the ASBR capability at the system level.
• Redistribution must be enabled on devices configured to operate as ASBRs.
• All device ports must be assigned to one of the defined areas on an OSPF device. When a port is assigned to an area, all
corresponding subnets on that port are automatically included in the assignment.
1. Enter the router ospf command in global configuration mode to enable OSPF on the device.
2. Assign the areas to which the device will be attached.
3. Assign individual interfaces to the OSPF areas.
4. Assign a virtual link to any ABR that does not have a direct link to the OSPF backbone area.
5. Refer to
Changing default settings on page 241.
Assigning OSPFv2 areas
Areas can be assigned as OSPFv2 areas.
1. Enter the configure terminal command to access global configuration mode.
device# configure terminal
2. Enter the router ospf command to enter OSPF router configuration mode and enable OSPFv2 on the device.
device(config)# router ospf
3. Enter the area command to define an OSPFv2 area ID.
device(config-ospf-router)# area 0
Configuring OSPFv2
Brocade FastIron Layer 3 Routing Configuration Guide
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