71
Step Command
Remarks
4.
Configure a virtual link.
vlink-peer
router-id
[
dead
seconds
|
hello
seconds
| { {
hmac-md5
|
md5
}
key-id
{
cipher
cipher-string
|
plain
plain-string
} |
simple
{
cipher
cipher-string
|
plain
plain-string
} }
|
retransmit
seconds
|
trans-delay
seconds
] *
By default, no virtual link is
configured.
Configure this command on both
ends of a virtual link, and the
hello
and
dead
intervals must be identical
on both ends of the virtual link.
Configuring OSPF network types
OSPF classifies networks into the following types based on the link layer protocol:
•
Broadcast
—
When the link layer protocol is Ethernet or FDDI, OSPF classifies the network type as
broadcast by default.
•
NBMA
—
When the link layer protocol is Frame Relay, ATM, or X.25, OSPF classifies the network
type as NBMA by default.
•
P2P
—
When the link layer protocol is PPP, LAPB, or HDLC, OSPF classifies the network type as P2P
by default.
When you change the network type of an interface, follow these guidelines:
•
When an NBMA network becomes fully meshed, change the network type to broadcast to avoid
manual configuration of neighbors.
•
If any routers in a broadcast network do not support multicasting, change the network type to
NBMA.
•
An NBMA network must be fully meshed. OSPF requires that an NBMA network be fully meshed.
If a network is partially meshed, change the network type to P2MP.
•
If a router on an NBMA network has only one neighbor, you can change the network type to P2P
to save costs.
Two broadcast-, NBMA-, and P2MP-interfaces can establish a neighbor relationship only when they are
on the same network segment.
Configuration prerequisites
Before you configure OSPF network types, complete the following tasks:
•
Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
•
Enable OSPF.
Configuring the broadcast network type for an interface
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter interface view.
interface
interface-type
interface-number
N/A
