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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 21 Configuring OSPF
Customizing OSPF
Step 6 Check or uncheck the Advertise check box to advertise the summary route. Uncheck this check box to
suppress routes that fall under the summary address. By default this check box is checked.
Step 7 The Tag value displays a 32-bit decimal value attached to each external route. This value is not used by
OSPF itself. It may be used to communicate information between ASBRs.
Step 8 Click OK.
Add/Edit OSPF Summary Address
To add or edit OSPF summary address setting, perform the following steps:
Step 1 In the main ASDM window, choose Configuration > Device Setup > Routing > OSPF > Setup.
Step 2 Click the Route Summarization tab.
The Add/Edit a Route Summarization Entry dialog box appears.
The Add/Edit a Route Summarization Entry dialog box allows you to add new entries to or modify
existing entries in the Summary Address table. Some of the summary address information cannot be
changed when editing an existing entry.
Step 3 Choose the specified OSPF Process ID associated with the summary address from the OSPF Process
drop-down list. You cannot change this information when editing an existing entry.
Step 4 Enter the IP address of the summary address in the IP Address field. You cannot change this information
when editing an existing entry.
Step 5 Enter the network mask for the summary address from the Netmask drop-down list. You cannot change
this information when editing an existing entry.
Step 6 Check or uncheck the Advertise check box to advertise the summary route. Uncheck this check box to
suppress routes that fall under the summary address. By default this check box is checked.
Configuring Route Summarization Between OSPF Areas
Route summarization is the consolidation of advertised addresses. This feature causes a single summary
route to be advertised to other areas by an area boundary router. In OSPF, an area boundary router
advertises networks in one area into another area. If the network numbers in an area are assigned in a
way such that they are contiguous, you can configure the area boundary router to advertise a summary
route that covers all the individual networks within the area that fall into the specified range.
To define an address range for route summarization, perform the following steps:
Step 1 In the main ASDM window, choose Configuration > Device Setup > Routing > OSPF > Setup.
Step 2 Click the Route Summarization tab.
The Add/Edit a Route Summarization Entry dialog box appears.
The Add/Edit a Route Summarization Entry dialog box allows you to add new entries to or modify
existing entries in the Summary Address table. Some of the summary address information cannot be
changed when editing an existing entry.
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