Generating A Default Route; Configuring Route Calculation Timers - Cisco 7604 Configuration Manual

Configuring OSPF
The following example shows how to configure route summarization. The summary address 10.1.0.0
includes address 10.1.1.0, 10.1.2.0, 10.1.3.0, and so on. Only the address 10.1.0.0 is advertised in an
external link-state advertisement:
hostname(config)# router ospf 1
hostname(config-router)# summary-address 10.1.0.0 255.255.0.0

Generating a Default Route

You can force an ASBR to generate a default route into an OSPF routing domain. Whenever you
specifically configure redistribution of routes into an OSPF routing domain, the router automatically
becomes an ASBR. However, an ASBR does not by default generate a default route into the OSPF
routing domain.
To generate a default route, perform the following steps:
If you have not already done so, enter the router configuration mode for the OSPF process you want to
Step 1
configure by entering the following command:
hostname(config)# router ospf process_id
To force the ASBR to generate a default route, enter the following command:
Step 2
hostname(config-router)# default-information originate [always] [metric metric-value]
[metric-type {1 | 2}] [route-map map-name]
The following example shows how to generate a default route:
hostname(config)# router ospf 2
hostname(config-router)# default-information originate always

Configuring Route Calculation Timers

You can configure the delay time between when OSPF receives a topology change and when it starts an
SPF calculation. You also can configure the hold time between two consecutive SPF calculations.
To configure route calculation timers, perform the following steps:
If you have not already done so, enter the router configuration mode for the OSPF process you want to
Step 1
configure by entering the following command:
hostname(config)# router ospf process_id
To configure the route calculation time, enter the following command:
Step 2
hostname(config-router)# timers spf spf-delay spf-holdtime
The spf-delay is the delay time (in seconds) between when OSPF receives a topology change and when
it starts an SPF calculation. It can be an integer from 0 to 65535. The default time is 5 seconds. A value
of 0 means that there is no delay; that is, the SPF calculation is started immediately.
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
8-18
Chapter 8 Configuring IP Routing and DHCP Services
OL-20748-01