3Com Switch 7700 Configuration Manual page 117

the neighboring routers from transmitting information, and lead to congestion or
self-loop of the routing information.
Perform the following configuration in OSPF Area view.
Table 25 Specifying Interface
Operation
Specify an interface to run OSPF
Disable OSPF on the interface
You must specify the segment to which the OSPF will be applied after enabling the
OSPF tasks.
Configuring Router ID
A router ID is a 32-bit unsigned integer that uniquely identifies a router within an
AS. A router ID can be configured manually. If a router ID is not configured, the
system selects the IP address of an interface automatically. When you set a router
ID manually, you must guarantee that the IDs of any two routers in the AS are
unique. A common undertaking is to make the router ID the same as the IP
address of an interface on the router.
Perform the following configurations in system view.
Table 26 Configuring Router ID
Operation
Configure router ID
Remove the router ID
To ensure the stability of OSPF, you must determine the division of router IDs and
manually configure them when implementing network planning.
Configuring the Network Type on the OSPF Interface
The route calculation of OSPF is based on the topology of the adjacent network of
the local router. Each router describes the topology of its adjacent network and
transmits it to all the other routers.
OSPF divides networks into four types by link layer protocol:
Broadcast: If Ethernet or FDDI is adopted, OSFP defaults the network type to
■
broadcast.
Non-Broadcast Multi-access (NBMA): If Frame Relay, ATM, HDLC or X.25 is
■
adopted, OSPF defaults the network type to NBMA.
Point-to-Multipoint (P2MP): OSPF does not default the network type of any link
■
layer protocol to P2MP. The general undertaking is to change a partially
connected NBMA network to P2MP network, if the NBMA network is not
fully-meshed.
Point-to-point (P2P): If PPP, LAPB or POS is adopted, OSPF defaults the network
■
type to P2P.
Command
network ip-address ip-mask
undo network ip-address ip-mask
Command
router id router-id
undo router id
OSPF 109