Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 320)

Disabling OSPFv3 in a VRF
To disable OSPFv3 for a default Virtual Routing and Forwarding (VRF), enter a command such as the
following.
device(config-ospf6-router)# no ipv6 router ospf vrf red
Syntax: [no] ipv6 router ospf vrf vrf-name
The vrf-name parameter specifies the name of the VRF in which OSPFv3 is being initiated.
If you disable OSPFv3, the device removes all the configuration information for the disabled protocol
from the running-configuration file. Moreover, when you save the configuration to the startup-config file
after disabling one of these protocols, all the configuration information for the disabled protocol is
removed from the startup-config file.
When you disable OSPFv3, the following warning message is displayed on the console.
device(config-ospf6-router)# no ipv6 router ospf
ipv6 router ospf mode now disabled. All ospf config data will be lost when writing
to flash!
If you have disabled the protocol but have not yet saved the configuration to the startup-config file and
reloaded the software, you can restore the configuration information by re-entering the command to
enable the protocol (for example, ipv6 router ospf). If you have already saved the configuration to the
startup-config file and reloaded the software, the configuration information is gone. If you are testing
an OSPF configuration and are likely to disable and re-enable the protocol, you should make a backup
copy of the startup-config file containing the protocol configuration information. This way, if you
remove the configuration information by saving the configuration after disabling the protocol, you can
restore the configuration by copying the backup copy of the startup-config file onto the flash memory.
NOTE
All the configuration examples below are applicable for OSPFv3 configuration mode in VRFs as well.
Assigning OSPFv3 areas
After OSPFv3 is enabled, you can assign OSPFv3 areas. You can assign an IPv4 address or a
number as the area ID for each area. The area ID is representative of all IPv4 addresses (subnets) on
a device interface. Each device interface can support one area.
An area can be normal, a stub, or a Not-So-Stubby Area (NSSA) :
• Normal - OSPFv3 devices within a normal area can send and receive External Link State
Advertisements (LSAs).
• Stub - OSPFv3 devices within a stub area cannot send or receive External LSAs. In addition, OSPF
devices in a stub area must use a default route to the area’s Area Border Router (ABR) or
Autonomous System Boundary Router (ASBR) to send traffic out of the area.
• NSSA - The ASBR of an NSSA can import external route information into the area.
‐ ASBRs redistribute (import) external routes into the NSSA as type 7 LSAs. Type-7
External LSAs are a special type of LSA generated only by ASBRs within an NSSA, and
are flooded to all the routers within only that NSSA.
‐ ABRs translate type 7 LSAs into type 5 External LSAs, which can then be flooded
throughout the AS. You can configure address ranges on the ABR of an NSSA so that the
ABR converts multiple type-7 External LSAs received from the NSSA into a single type-5
External LSA.
Disabling OSPFv3 in a VRF
320 FastIron Ethernet Switch Layer 3 Routing Configuration Guide
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