SmartMIB Small Solution:

OSPF Topology Wide LSA Database Change Detection

(SM-SmallSol019)

Solution Introduction & Overview:

This Small management solution provides an application that monitors the Link State Advertisement (LSA) database checksum value on each OSPF participating device and across the whole of the OSPF neighbours maintaining a higher level monitoring of OSPF topology wide management information.

The main goal of the management process is to provide a general understanding of the OSPF service health on each of the participating OSPF devices as well as on the OSPF neighbours.

The solution presentation is also based on the MIB-II which in turn is based on the IETF standard MIBs RFC 1213 and RFC1253 which includes the objects necessary to maintain the IP Process and the OSPF statistics respectively.

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 OSPF devices and neighbours Link-State database checksum values are collected and stored for each router device only to be compared with each run of the management process to the previously recorded values of the checksum for each device and with other OSPF neighbouring devices. 

The user has the choice to graph the DevCKSUM_COUNT representing the number of times the link-state advertisements' LS checksums contained in each OSPF device’s link-state database. This is better viewed using a ‘Step’ graph type.

The administrator could also create a new binary type object that is set to one whenever the LSA database checksum changes and resets itself back to zero until another change is detected and so on.

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