Configuring Route Summarization When Redistributing Routes Into Ospf; Generating A Default Route - Cisco Catalyst 6500 Series Configuration Manual

Configuring OSPF

Configuring Route Summarization When Redistributing Routes into OSPF

Single context mode only
Routed firewall mode only
When routes from other protocols are redistributed into OSPF, each route is advertised individually in
an external LSA. However, you can configure the FWSM to advertise a single route for all the
redistributed routes that are covered by a specified network address and mask. This configuration
decreases the size of the OSPF link-state database.
To configure the software advertisement on one summary route for all redistributed routes covered by a
network address and mask, follow these 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:
FWSM(config)# router ospf process_id
To set the summary address, enter the following command:
Step 2
FWSM(config-router)# summary-address ip_address mask [not advertise] [tag tag ]
OSPF does not support summary-address 0.0.0.0 0.0.0.0.
In the following example, 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:
FWSM(config)# router ospf 1
FWSM(config-router)# summary-address 10.1.0.0 255.255.0.0

Generating a Default Route

Single context mode only
Routed firewall mode only
You can force an autonomous system boundary router 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 autonomous system boundary router. However, an autonomous system
boundary router does not by default generate a default route into the OSPF routing domain.
To generate a default route, follow these 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:
FWSM(config)# router ospf process_id
To force the autonomous system boundary router to generate a default route, enter the following
Step 2
command:
FWSM(config-router)# default-information originate [always] [metric metric-value ]
[metric-type {1 | 2}] [route-map map-name ]
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide
8-14
Chapter 8 Configuring IP Addresses, Routing, and DHCP
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