Cisco ASA 5505 Configuration Manual page 401

Chapter 21 Configuring OSPF
Choose the Area ID that is associated with the filter entry from the Area ID drop-down list. If you are
Step 4
editing an existing filter entry, you cannot modify this setting.
Step 5 In the Filtered Network field, enter the address and mask of the network being filtered using CIDR
notation (a.b.c.d/m).
Step 6 Choose the traffic direction being filtered from the Traffic Direction drop-down list.
Choose "Inbound" to filter LSAs coming into an OSPF area, or "Outbound" to filter LSAs coming out
of an OSPF area. If you are editing an existing filter entry, you cannot modify this setting.
In the Sequence # field, enter a sequence number for the filter.
Step 7
Valid values range from 1 to 4294967294. When multiple filters apply to an LSA, the filter with the
lowest sequence number is used.
Choose either Permit or Deny from the Action drop-down list.
Step 8
Choose Permit to allow the LSA traffic or Deny to block the LSA traffic.
Step 9 In the Optional area, choose the following filtering options:
•
•
Click OK.
Step 10
Configuring a Virtual Link in OSPF
If you add an area to an OSPF network, and it is not possible to connect the area directly to the backbone
area, you need to create a virtual link. A virtual link connects two OSPF devices that have a common
area, called the transit area. One of the OSPF devices must be connected to the backbone area.
The Add/Edit Virtual Link dialog box lets you define new virtual links or change the properties of
existing virtual links.
In the main ASDM window, choose Configuration > Device Setup > Routing > OSPF > Virtual Link.
Step 1
Choose Add or Edit.
Step 2
The Add/Edit OSPF Virtual Link dialog box appears, which allows you to define new virtual links or
change the properties of existing virtual links.
Choose the OSPF process ID that is associated with the virtual link from the OSPF Process drop-down
Step 3
list. If you are editing an existing virtual link entry, you cannot modify this setting.
Choose the Area ID that is associated with the virtual link from the Area ID drop-down list.
Step 4
Choose the area shared by the neighbor OSPF devices. The selected area cannot be an NSSA or a Stub
area. If you are editing an existing virtual link, you cannot change this value. If you are editing an
existing virtual link entry, you cannot modify this setting.
In the Peer Router ID field, enter the router ID of the virtual link neighbor.
Step 5
If you are editing an existing virtual link entry, you cannot modify this setting.
OL-20339-01
Lower Range—Specify the minimum prefix length to be matched. The value of this setting must be
greater than the length of the network mask entered in the Filtered Network field and less than or
equal to the value, if present, entered in the Upper Range field.
Upper Range—Enter the maximum prefix length to be matched. The value of this setting must be
greater than or equal to the value, if present, entered in the Lower Range field, or, if the Lower Range
field is left blank, greater than the length of the network mask length entered in the Filtered Network
field.
Cisco ASA 5500 Series Configuration Guide using ASDM
Customizing OSPF
21-17