3Com 4800G Series, Configuration Manual

Page: 296 / 1246

296 C
HAPTER
28: OSPF C
ONFIGURATION
For routers having no direct link in between, you can configure the P2MP type for
the related interfaces. If a router in the NBMA network has only a single peer, you
can configure the P2P type for the related interfaces.
In addition, when configuring broadcast and NBMA networks, you can specify for
interfaces router priorities for DR/BDR election. In practice, the routers having
higher reliability should become the DR/BDR.
Prerequisites 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.
Configuring the OSPF
Network Type for an
Interface
Follow these steps to configure the OSPF network type for an interface:
n
■
Configuring a new network type for an interface overwrites the previous one (if
any).
■
If the two interfaces on a link are both configured as the broadcast, NBMA or
P2MP type, they can not establish the neighbor relationship unless they are on
the same network segment.
Configuring an NBMA
Neighbor
For NBMA interfaces that cannot broadcast hello packets to find neighbors, you
need to specify the IP addresses and DR priorities of neighbors manually.
Follow these steps to configure a neighbor and its DR priority:
Configuring a Router
Priority for an OSPF
Interface
For broadcast or NBMA interfaces, you can configure router priorities for DR/BDR
election.
Follow these steps to configure a router priority for an OSPF interface:
To do… Use the command… Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Configure a network type ospf network-type
{ broadcast | nbma | p2mp
| p2p }
Optional
Not configured by default
The network type of an interface
depends on the media type of
the interface.
To do… Use the command… Remarks
Enter system view system-view -
Enter OSPF view ospf [ process-id | router-id router-id ] * -
Specify an NBMA neighbor and its DR
priority peer ip-address [ dr-priority dr-priority ] Required