Cisco 7604 Configuration Guide - Page 156
Configuring OSPF Area Parameters, no-summary, area stub
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Configuring OSPF Chapter 8 Configuring IP Routing and DHCP Services Number of interfaces in this area is 1 Area has no authentication SPF algorithm executed 2 times Area ranges are Number of LSA 5. Checksum Sum 0x 209a3 Number of opaque link LSA 0. Checksum Sum 0x 0 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0 Configuring OSPF Area Parameters You can configure several area parameters. These area parameters (shown in the following task table) include setting authentication, defining stub areas, and assigning specific costs to the default summary route. Authentication provides password-based protection against unauthorized access to an area. 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. To take advantage of the OSPF stub area support, default routing must be used in the stub area. To further reduce the number of LSAs sent into a stub area, you can configure the no-summary keyword of the area stub command on the ABR to prevent it from sending summary link advertisement (LSA type 3) into the stub area. To specify area parameters for your network, perform the following steps: Step 1 Step 2 If you have not already done so, enter the router configuration mode for the OSPF process you want to configure by entering the following command: hostname(config)# router ospf process_id Enter any of the following commands: • To enable authentication for an OSPF area, enter the following command: hostname(config-router)# area area-id authentication • To enable MD5 authentication for an OSPF area, enter the following command: hostname(config-router)# area area-id authentication message-digest • To define an area to be a stub area, enter the following command: hostname(config-router)# area area-id stub [no-summary] • To assign a specific cost to the default summary route used for the stub area, enter the following command: hostname(config-router)# area area-id default-cost cost The cost is an integer from 1 to 65535. The default is 1. The following example shows how to configure the OSPF area parameters: hostname(config)# router ospf 2 hostname(config-router)# area 0 authentication hostname(config-router)# area 0 authentication message-digest hostname(config-router)# area 17 stub 8-14 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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