Alcatel Carrier Internetworking Solutions 060187-10 REV D 사용자 설명서

Configuring OSPF

Configuring OSPF

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OmniSwitch 6600 Family Advanced Routing Configuration Guide

It is possible to configure neighbors statically on Non Broadcast Multi Access (NBMA), point-to-point, 
and point-to-multipoint networks. 

NBMA requires all routers attached to the network to communicate directly (unicast), and every attached 
router in this network becomes aware of all of its neighbors through configuration. It also requires a 
Designated Router (DR) “eligibility” flag to be set for every neighbor.

To set up a router to use NBMA routing, follow the following steps:

1 Create an OSPF interface using the CLI command 

 and perform all the normal config-

uration for the interface as with broadcast networks (attaching it to an area, enabling the status, etc.). 

2 The OSPF interface type for this interface should be set to non-broadcast using the CLI

 command. For example, to set interface 1.1.1.1 to be an NBMA interface, enter the 

following:

-> ip ospf interface 1.1.1.1 type non-broadcast

3 Configure static neighbors for every OSPF router in the network using the 

For example, to set an OSPF neighbor with an IP address of 1.1.1.8 to be a static neighbor, enter the 
following:

-> ip ospf neighbor 1.1.1.8 eligible

The neighbor attaches itself to the right interface by matching the network address of the neighbor and the 
interface. If the interface has not yet been created, the neighbor gets attached to the interface as and when 
the interface comes up. 

If this neighbor is not required to participate in DR election, configure it as non-eligible. The eligibility 
can be changed at any time as long as the interface it is attached to is in the disabled state.