3Com 8807 Command Reference Manual page 729

If you enable an OSPF process without specifying a Router ID, and the process is to
be bound to a VPN instance, the VPN instance should have an interface that is
configured with an IP address.
If you want to bind a process to a VPN instance, you must specify the VPN instance
name.
One VPN instance may include several processes. For example, for VPN1, you can
configure the commands OSPF 1 VPN-instance VPN1, OSPF2 VPN-instance
VPN1, and OSPF3 VPN-instance VPN1. Accordingly, VPN instance VPN1 will
include the OSPF processes 1, 2, and 3.
However, one process belongs to one instance only. If you have configured OSPF 1
VPN-instance VPN1, you cannot configure OSPF 1 VPN-instance VPN2.
Otherwise, the system prompts: "Wrong configuration. Process 1 has been bound
to VPN-instance VPN-instance 1". If you configure OSPF 1 first and then OSPF 1
VPN-instance VPN1, the system prompts: "Wrong configuration. Process 1 has
been running in public domain".
If you configure OSPF 1 VPN-instance VPN1 first and then OSPF 1, the system
enters OSPF 1 VPN-instance VPN1 mode. That is, the OSPF 1 and OSPF 1
VPN-instance VPN1 commands are equivalent.
When an OSPF process is bound to a VPN instance, the default OSPF router is PE
router. After executing the display OSPF process-id brief command, you will view
the information: "PE router, connected to VPN backbone".
c
CAUTION:
A router can run no more than 1024 OSPF processes, with up to 10 processes
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enabled in each VPN instance.
If you bind an OSPF process to a nonexistent VPN instance, the configuration
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for the command fails and display the errors: The specified VPN-Instance does
not exist, or the VPN-Instance's Route-Distinguisher is not specified.
When a VPN instance is deleted, all the related OSPF processes will be deleted.
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For example, the VPN instance VPN 1 includes the OSPF processes 1, 2 and 3. If
VPN instance VPN 1 is deleted, the OSPF processes 1, 2 and 3 will all be deleted
at the same time.
Related command: network.
Example
# Enable OSPF protocol with the default process ID 1.
[SW8800] router id 10.110.1.8
[SW8800] ospf
# Enable OSPF protocol with the process ID 120.
[SW8800] router id 10.110.1.8
[SW8800] ospf 120
[3Com-ospf-120]
# Enable OSPF process with the process ID 100, specify its Route ID to 2.2.2.2, and
bind it to VPN instance VPN1.
LDP Configuration Commands 727