Cabletron Systems 9032578-05 Benutzerhandbuch

OSPF areas are a collection of subnets that are grouped in a logical fashion. These areas 
communicate with other areas via the backbone area. Once OSPF areas are created, you 
can add interfaces, stub hosts, and summary ranges to the area.

In order to reduce the amount of routing information propagated between areas, you can 
configure summary-ranges on Area Border Routers (ABRs). On the SSR, summary-ranges 
are created using the ospf add summary-range command – the networks specified using 
this command describe the scope of an area. Intra-area Link State Advertisements (LSAs) 
that fall within the specified ranges are not advertised into other areas as inter-area routes. 
Instead, the specified ranges are advertised as summary network LSAs.

To create areas and assign interfaces, enter the following commands in the Configure 
mode.

Specify the number of seconds 
required to transmit a link state 
update on an OSPF interface.

<name-or-IPaddr>

Specify the time a neighbor router 
will listen for OSPF hello packets 
before declaring the router down.

<name-or-IPaddr>

<num> 

Disable IP multicast for sending OSPF 
packets to neighbors on an OSPF 
interface.

<name-or-IPaddr>

Specify the poll interval on an OSPF 
interface.

<name-or-IPaddr>

Specify the identifier of the key chain 
containing the authentication keys.

<name-or-IPaddr>

Specify the authentication method to 
be used on this interface.

<name-or-IPaddr>

Create an OSPF area.

ospf create area 

Add an interface to an OSPF area.

<name-or-IPaddr>