Web Agent Procedure

To search the OSPF link state database using the Web Agent:

1. Select Link State Database Search from the Routing > IP > OSPF group on the Web Agent window. The Link State Database Search dialog box opens (Figure 15-12).

NOTE: You can select more than one item in the Search By column to help narrow your search results.

Figure 15-12. Link State Database Search Dialog Box

2. To search by:
• Area ID -- click the Area ID checkbox and specify the IP address of the Area ID that you want to find in the database, and click SEARCH.
• Type -- click the Type checkbox and from the Type pull-down menu, select the type of search you want to perform, and click SEARCH.
• Router ID -- click the Router ID checkbox and specify the router IP address, and click SEARCH.
3. See Table 15-9 for an explanation of the OSPF Link State Database Search dialog box parameters:

   Table 15-9. OSPF Link State Database Search Dialog Box Parameters

   Parameter	Allows you to...
   Area ID	Searches the database for the 32-bit identifier of the area from which a LSA was received.
   Type	Searches the database for all entries that match one of the following types: Router Links - These packets describe the states of the router’s links to the area and are only flooded within a particular area. Network Links - These packets are generated by Designated Routers and describe the set of routers attached to a particular network. Summary Network - These summaries are generated by Area Border Routers and describe inter-area routes to various networks. They can also be used for aggregating routes. Summary AS border - This describes links to Autonomous System Border Routers and are generated by Area Border Routers. AS external - These packets are generated by Autonomous System Border Routers and describe routes to destination external to the Autonomous system. They are flooded everywhere except stub areas. Multicast group - These packets are generated by multicast groups. NSSA external - These packets are generated by Area Border Routers and describe routes within the NSSA (Not-So-Stubby-Area).
   Router ID	Searches the database for all entries that this router originated.

4. If your search produces results, the detailed information displays in the OSPF Link State Database dialog box (Figure 15-13).

Figure 15-13. OSPF Link State Database Dialog Box

5. See Table 15-10 for an explanation of the OSPF Link State Database dialog box parameters.

   Table 15-10. OSPF Link State Database Parameters  

   Parameter	Displays...
   Detail Link	A link to the LSA Detail dialog box.
   Area ID	The 32-bit identifier of the area from which the LSA was received.
   Type	The LSA format and function. Types include: Router Links - These packets describe the states of the router’s links to the area and are only flooded within a particular area. Network Links - These packets are generated by Designated Routers and describe the set of routers attached to a particular network. Summary Network - These summaries are generated by Area Border Routers and describe inter-area routes to various networks. They can also be used for aggregating routes. Summary AS Border - This describes links to Autonomous System Border Routers and are generated by Area Border Routers. AS External - These packets are generated by Autonomous System Border Routers and describe routes to destinations external to the Autonomous system. They are flooded everywhere except stub areas. Multicast Group - These packets are generated by multicast groups. NSSA External - These packets are generated by Area Border Routers and describe routes within the NSSA (Not-So-Stubby-Area).
   LS ID	The piece of routing domain that is being described by the advertisement. Depending on the advertisements LS type, the LS ID displays different values.
   Router ID	The 32-bit number that uniquely identifies the originating router in the Autonomous System.
   Sequence	The sequence number.
   Age	Displays the age (in seconds) of the LSA.
   Checksum	Displays the checksum of the complete contents of the advertisement, except the age field.

6. To update all LSA entries in the database, select Refresh Table.
7. To display the details of a specific link state advertisement (LSA), select Details from the Detail Link column The LSA Detail dialog box displays with additional search information (Figure 15-14).

Figure 15-14. LSA Detail Dialog Box

8. See Table 15-11 for an explanation of the LSA Detail dialog box parameters.

   Table 15-11. LSA Detail Dialog Box Parameters

   Parameter	Definition
   Area	Displays the 32-bit identifier of the area from which the LSA was received.
   Type	Displays the link state type. Types include: Router Links Network Links Summary Network Summary AS Border AS External Multicast Group NSSA External
   LS ID	Displays the link-state ID. The link-state ID is an LS type specific field containing either a router ID or an IP address that identifies the piece of the routing domain that is being described by the advertisement.
   Router ID	Displays the router ID of the originator of the link state advertisement.
   Sequence	Displays the link-state sequence number. The sequence number is a 32-bit signed integer.
   Checksum	Displays the checksum of the complete contents of the advertisement, except the age field.
   Age	Displays the time (in seconds) of the LSA.
   Network Mask	Displays the network mask for the LSA.
   Attached Router ID 1 &2	Displays the router ID for the attached router(s).

9. To update the LSA entry, select Refresh Entry.