Cabletron Systems 9032578-05 Configuring Ospf for Different Types of Interfaces, Create a virtual

Chapter 11: OSPF Configuration Guide

To configure virtual links, enter the following commands in the Configure mode.

Create a virtual	ospf add virtual-link <number-or-string>neighbor <IPaddr>
link.	transit-area <area-num>
Set virtual link	ospf set virtual-link <number-or-string>
parameters.	[state disableenable] [cost <num>]
	[retransmit-interval <num>] [transit-delay <num>]
	[priority <num>] [hello-interval <num>]
	[router-dead-interval <num>] [poll-interval <num>]

Configuring Autonomous System External (ASE) Link Advertisements

Because of the nature of OSPF, the rate at which ASEs are flooded may need to be limited. The following parameters can be used to adjust those rate limits. These parameters specify the defaults used when importing OSPF ASE routes into the routing table and exporting routes from the routing table into OSPF ASEs.

To specify AS external link advertisements parameters, enter the following commands in the Configure mode:

Specifies how often a batch of	ospf set export-interval <num>
ASE link state advertisements
will be generated and flooded
into OSPF. The default is 1 time
per second.
Specifies how many ASEs will	ospf set export-limit <num>
be generated and flooded in
each batch. The default is 250.
Specifies AS external link	ospf set ase-defaults {[preference <num>]
advertisement default	[cost <num>][type <num>]
parameters.	[inherit-metric]}

Configuring OSPF for Different Types of Interfaces

The SmartSwitch Router can run OSPF over a variety of physical connections: Serial connections, LAN interfaces, ATM, or Frame Relay. The OSPF configuration supports four different types of interfaces.

•LAN. An example of a LAN interface is an Ethernet. The SSR will use multicast packets on LAN interfaces to reach other OSPF routers. By default, an IP interface attached to a VLAN that contains LAN ports is treated as an OSPF broadcast network.

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