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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 21 Configuring OSPF
Customizing OSPF
The Add OSPF Area dialog box appears.
Step 4 Choose NSSA in the Area Type area.
Choose this option to make the area a not-so-stubby area. NSSAs accept Type 7 LSAs. When you create
a NSSA, you have the option of preventing summary LSAs from being flooded into the area by
unchecking the Summary check box. You can also disable route redistribution by unchecking the
Redistribute check box and enabling Default Information Originate.
Step 5 Enter the IP address in the IP Address field of the network or host to be added to the area. Use 0.0.0.0
with a netmask of 0.0.0.0 to create the default area. You can only enter 0.0.0.0 in one area.
Step 6 Enter the network mask in the Network Mask field for the IP address or host to be added to the area. If
adding a host, choose the 255.255.255.255 mask.
Step 7 In the Authentication area, click None.
Choices include:
• None—This option disables OSPF area authentication. This is the default setting.
• Password—This option provides a clears text password for area authentication. This option is not
recommended where security is a concern.
• MD5—This option allows MD5 authentication.
Step 8 Enter a value in the Default Cost field to specify a default cost for the OSPF area.
Valid values range from 0 to 65535. The default value is 1.
Step 9 Click OK.
Defining Static OSPF Neighbors
You need to define static OSPF neighbors to advertise OSPF routes over a point-to-point, non-broadcast
network. This lets you broadcast OSPF advertisements across an existing VPN connection without
having to encapsulate the advertisements in a GRE tunnel.
Before you begin, you must create a static route to the OSPF neighbor. See Chapter 19, “Configuring
Static and Default Routes,” for more information about creating static routes.
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