3Com 3031 Command Reference Manual page 791

Description
Using the ospf command, you can an enable OSPF procedure. Using the undo ospf
command, you can disable an OSPF procedure.
After enabling OSPF procedure, you can perform OSPF configurations in the OSPF
protocol view.
By default, no OSPF protocol is enabled.
VRP supports multiple OSPF procedures, so you can specify different procedure IDs
to enable multiple OSPF procedures on a router.
It is recommended to specify procedure route-id with the router-id parameter in
enabling OSPF procedure. If you want to enable multiple processes on a router,
you are recommended to specify different router IDs for different procedures.
To enable an OSPF procedure belonging to public network without specifying
router ID, the following conditions should be satisfied:
RM is configured with router ID.
There is an interface which configured with IP address.
If router ID is not specified in enabling OSPF procedure and binding the procedure
with a VPN instance is required, an interface must exist which has been configured
with IP address.
If you want to bind a procedure to a VPN instance, you must specify VPN instance
name.
One VPN instance may include several procedures. For example, for the VPN
instance 1, you can configure it into OSPF procedures 1, 2 and 3 with the
commands ospf 1 vpn-instance vpn1, ospf 2 vpn-instance vpn1, and ospf 3
vpn-instance vpn1.
But one procedure can belong to only one instance. If you have executed ospf 1
vpn-instance vpn1, you cannot configure ospf 1 vpn-instance vpn2. Otherwise,
the system prompts the information "Wrong configuration. Process 1 has been
bound to vpn-instance VRF1". If you configure ospf 1 first and then execute ospf 1
vpn-instance vpn1, the system prompts the information "Wrong configuration.
Process 1 has been running in public domain".
If you execute ospf 1 vpn-instance vpn1 first and then configure ospf 1, the system
enters ospf 1 vpn-instance vpn1 view, in which the commands ospf 1 and ospf 1
vpn-instance vpn1 are equivalent.
When an OSPF procedure is bound to a VPN instance, the default OSPF router is PE
router. After executing the display ospf process-id brief command, you will get the
information "PE router, connected to VPN backbone".
CAUTION:
A router can run a maximum of 1024 OSPF procedures, with up to 10
procedures in each VPN instance.
BGP/MPLS VPN Configuration Commands 791