SmartMIB Small Solution:

Higher Level OSPF Area Metrics

(SM-SmallSol018)

Solution Overview:

This management solution focuses on detecting ONLY those devices that are designated as OSPF routing participants. The solution defines a module name and description, then initiates the polling process under which the Devices (or in a specified AMZ) are fed into the polling SNMP engine, where the OSPF status of the device is determined through polling the value of the ospfAdminStat MIB Object. A variable handler is then defined to store the value which is then tested with an IF conditional statement; if the status for the particular device is ‘OSPF enabled’ then the counters for each of configured OSPF Areas are collected.

The management solution collects the number of times that the intra-area route table has been calculated using each of the areas link-state databases. It also collects the sum of the link-state advertisements' LS checksums contained in each area's link-state database. This sum excludes external (LS type 5) link-state advertisements and it can be used to determine if there has been a change in a router's link state database, and to compare the link-state database of two OSPF participating routers. More specifically the management solution keeps a count whenever this checksum value changes.

There are several data items that are not actually in the OSPF area MIB data that are included in this section and when combined with the OSPF data and across the OSPF topology would achieve this higher level OSPF Area metric. The ipInAddrErrors, IpRoutingDiscards, and ipOutNoRoute objects are in the MIB-2 definition, but are not associated with an OSPF area. These objects are associated with the router’s IP Process. Therefore, these counters are used as an OSPF area metric by adding the values for each node in an area to an area counter. For example, in the OSPF area report, the number of packets discarded due to no route found is actually the sum of the packets discarded by all of the routers in that OSPF area.

The user has the choice to graph all of the following collected objects:

• DeltaOspfSpfRuns: representing the number of times that the intra-area route table has been calculated using each of the areas link-state databases.

• DevAreaCKSUM_COUNTdb: representing the sum of the link-state advertisements' LS checksums contained in each area's link-state database. This is better viewed using a ‘Step’ graph type.

• DeltaIpOutNoRoutes, and DeltaIpRoutingDiscards, and  DeltaIpInAddrErrors: representing the Internal managed device’s IP routing process errors.

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