Configuring Ospf Network Types; Configuration Prerequisites - HP 3600 v2 series Configuration Manual

To do...
Enter OSPF view
Enter area view
Configure a virtual link

Configuring OSPF network types

OSPF classifies networks into the following types by the link layer protocol:
Broadcast—When the link layer protocol is Ethernet or FDDI, OSPF considers the network type as
•
broadcast by default.
NBMA—When the link layer protocol is Frame Relay, ATM, or X.25, OSPF considers the network
•
type as NBMA by default.
• P2P—When the link layer protocol is PPP, LAPB, or HDLC, OSPF considers the network type as P2P
by default.
The following are examples of how you can change the network type of an interface as needed:
• When an NBMA network becomes fully meshed through address mapping—any two routers in the
network have a direct virtual circuit in between, you can change the network type to broadcast to
avoid manual configuration of neighbors.
When some routers in the broadcast network do not support multicast, you can change the network
•
type to NBMA.
An NBMA network must be fully meshed. If it is partially meshed, you can change the network type
•
to P2MP to simplify configuration and save network costs.
If a router on an NBMA network has only one neighbor, you can change the network type to P2P
•
to save network costs.
If two interfaces on a link are both configured as the broadcast, NBMA, or P2MP network type, they
cannot establish a neighbor relationship unless they are on the same network segment.

Configuration prerequisites

Before configuring OSPF network types, complete the following tasks:
• Configure IP addresses for interfaces, making neighboring nodes accessible with each other at
network layer
Configure OSPF basic functions
•
Use the command...
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
area area-id
vlink-peer router-id [ hello seconds
| retransmit seconds | trans-delay
seconds | dead seconds | simple
[ plain | cipher ] password | { md5
| hmac-md5 } key-id [ plain |
cipher ] password ] *
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Remarks
—
—
Required
You must configure this command on
both ends of a virtual link.
hello and dead intervals must be
identical on both ends of the virtual
link.