3Com 7757 Configuration Manual page 310

310 C 34: OSPF C
HAPTER
n
ONFIGURATION
configure router IDs manually, make sure each router ID is uniquely used by one
router in the AS. A common practice is to set the router ID to the IP address of an
interface on the router.
Enabling OSPF
■
The Switch 7750 supports multiple OSPF processes. To enable multiple OSPF
processes on a router, you need to specify different process IDs. OSPF process ID is
only locally significant; it does not affect the packet exchange between an OSPF
process and other routers. Therefore, packets can be exchanged between routers
with different OSPF processes IDs.
Configuring an area and the network segments in the area. You need to plan
■
areas in an AS before performing the corresponding configurations on each
router.
When configuring the routers in the same area, please note that most
configurations should be uniformly made based on the area. Wrong configuration
may disable information transmission between neighboring routers and even lead
to congestion or self-loop of routing information.
Table 231 Basic OSPF configuration
Operation
Enter system view
Disable protocol multicast MAC
address delivery
Configure the router ID
Enable OSPF and enter OSPF view
Enter OSPF area view
Configure the network segments in
the area
The undo protocol multicast-mac enable command must be configured if
■
Layer 2/Layer 3 multicast function is enabled in the system.
In router ID selection, the priorities of the router IDs configured with the ospf
■
[ process-id [ router-id router-id ] ] command, the router id command, and
the priorities of the router IDs automatically selected are in a descending order.
Router IDs can be re-selected. A re-selected router ID takes effect only after the
■
OSPF process is restarted.
The ospf [ process-id [ router-id router-id ] ] command is recommended for
■
configuring router IDs manually.
Command
system-view
undo protocol
multicast-mac enable
router id router-id
ospf [ process-id
[ router-id router-id ] ]
area area-id
network address
wildcard-mask
Description
-
Optional
Optional
If multiple OSPF processes
run on a router, you are
recommended to use the
router-id keyword in the
following command to
specify different router IDs
for different processes.
-
-
Required
By default, an interface
does not belong to any
area.