3Com Switch 7750 Configuration Guide

310 CHAPTER 34: OSPF CONFIGURATION
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.
n
■ 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.
Table 231 Basic OSPF configuration
Operation Command Description
Enter system view system-view -
Disable protocol multicast MAC
address delivery
undo protocol
multicast-mac enable
Optional
Configure the router ID router id router-id 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.
Enable OSPF and enter OSPF view ospf [ process-id
[ router-id router-id ]]
-
Enter OSPF area view area area-id -
Configure the network segments in
the area
network address
wildcard-mask
Required
By default, an interface
does not belong to any
area.