HP VPN Firewall Appliances Network Management Configuration Guide

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You can configure virtual links to ensure the connectivity when physical links are not enough. Virtual links
cannot transit a stub area or totally stub areas.
To configure a virtual link:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter OSPF view.
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
N/A
3. Enter area view.
area area-id N/A
4. Configure a virtual
link.
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 ] *
Configure this command on both
ends of a virtual link.
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 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.
Follow these guidelines when you change the network type of an interface:
• When an NBMA network becomes fully meshed (any two routers in the network have a direct
virtual circuit in between), change the network type to broadcast to avoid manual configuration of
neighbors.
• If some routers in a broadcast network do not support multicasting, change the network type to
NBMA.
• An NBMA network must be fully meshed. If it is partially meshed, change the network type to P2MP
to simplify configuration and save costs.
• If a router on an NBMA network has only one neighbor, change the network type to P2P to save
costs.
Two broadcast-, NBMA-, P2MP-type 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.