Configuring Ospf Network Types; Prerequisites; Configuring The Ospf Network Type For An Interface - 3Com MSR 50 Series Configuration Manual

Configuring OSPF
Network Types

Prerequisites

Configuring the OSPF
Network Type for an
Interface
To do...
Create and configure a virtual
link
Configure and advertise a
host route
n
It is required to use the stub command on routers attached to a stub area.
■
It is required to use the nssa command on routers attached to an NSSA area.
■
Using the default-cost command only takes effect on the ABR of a stub area
■
or the ABR/ASBR of an NSSA area.
OSPF classifies networks into four types upon link layer protocols. Since an NBMA
network must be fully meshed, namely, any two routers in the network must have
a virtual link in between. In most cases, however, the requirement cannot be
satisfied, so you need to change the network type using commands.
For routers having no direct link in between, you can configure related interfaces
as the P2MP mode. If a router in the NBMA network has only a single peer, you
can also configure associated interfaces as the P2P mode.
In addition, when configuring broadcast and NBMA networks, you can specify for
interfaces router priorities for DR/BDR election. In practice, routers having higher
reliability should become the DR/BDR.
Before configuring OSPF network types, you have configured:
IP addresses for interfaces, making neighboring nodes accessible with each
■
other at network layer.
OSPF basic functions
■
Follow these steps to configure the OSPF network type for an interface:
To do...
Enter system view
Enter interface view
Configure the network
type
n
Configuring a new network type for an interface overwrites the previous
■
network one (if any).

Configuring OSPF Network Types

Use the command...
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 ] *
host-advertise ip-address
cost
Use the command...
system-view
interface interface-type
interface-number
ospf network-type
{ broadcast | nbma | p2mp |
p2p }
Remarks
Optional
Configured on both ends of a
virtual link
Note that hello and dead
parameters must be identical
on both ends of the link
Optional
Not advertised by default
Remarks
-
-
Optional
Not configured by default
The network type of an interface
depends on the media type of
the interface
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