Cabletron Systems SmartSwitch manual Configuring Ospf Area Parameters, Creating Virtual Links

Chapter 9: OSPF Configuration Guide

Add a stub host to an OSPF area.	ospf add stub-host [to-area <area-
	addr>backbone]
	[cost <num>]
Add a network to an OSPF area for	ospf add network <IPaddr/mask> [to-area
summarization.	<area-addr>backbone] [restrict]
	[host-net]

Configuring OSPF Area Parameters

The SSR allows configuration of various OSPF area parameters, including stub areas, stub cost and authentication method. Stub areas are areas into which information on external routes is not sent. Instead, there is a default external route generated by the ABR, into the stub area for destinations outside the autonomous system. Stub cost specifies the cost to be used to inject a default route into a stub area. An authentication method for OSPF packets can be specified on a per-area basis.

To configure OSPF area parameters, enter the following commands in the Configure mode.

Specify an OSPF stub area.	ospf set area <area-num>stub
Specify the cost to be used to inject a	ospf set area <area-num>stub-cost <num>
default route into an area.
Specify the authentication method	ospf set area <area-num>[stub]
to be used by neighboring OSPF	[authentication-method
routers.	nonesimplemd5]

Creating Virtual Links

In OSPF, virtual links can be established:

•To connect an area via a transit area to the backbone

•To create a redundant backbone connection via another area

Each Area Border Router must be configured with the same virtual link. Note that virtual links cannot be configured through a stub area.

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