Choose Tools→Route Analysis→IGP Topology from the NFM-P main menu. The IGP Topology form opens.

Right-click on the topology map and choose IGP History from the contextual menu.

Choose the IGP topology from the contextual menu. The IGP Graphical History form opens.

Configure the Time Interval Type parameter.

Perform one of the following:

1. If you selected Rewind From/To Interval, configure the Start Time and End Time parameters.

2. If you selected Rewind From Current Time, configure the Time Interval (in minutes) parameter.

Enable the following parameters, as required:

• Configure Link Specific Filters—specifies whether, in the graphical history, the specified link differences and link properties are included. You must enable the Configure Link Specific Filters parameter to configure the filter.

  Note:

  You can choose any combination of link differences and link properties. If you choose more than one difference or property, the CPAM uses an OR filter.

• Include/Exclude All Link Differences — specifies whether all of the differences between the two checkpoints included in the graphical history are included. You must enable the Configure Link Specific Filters option to configure this option and to enable or disable included link differences. This option is enabled by default, and all of the link differences are included.

• Include/Exclude All Link Properties — specifies whether all of the all of the differences between specific properties of the two checkpoints included in the graphical history are listed. You must enable the Configure Link Specific Filters option to configure this option and to enable or disable included link properties. This option is enabled by default, and all of the link properties are included.

When you enable the Configure Link Specific Filters option, you can include or exclude the following link differences:

When you enable the Configure Link Specific Filters option, you can include or exclude the following link properties:

• Operational state

• Operational state change counter

• Metric

• Metric change counter

• Administrative groups

• Administrative groups change counter

• TE metric

• TE metric change counter

• SRLG values

• SRLG change counter

• Maximum bandwidth (kbps)

• Unreserved bandwidth (Priority 0) (kbps)

• Unreserved bandwidth (Priority 1) (kbps)

• Unreserved bandwidth (Priority 2) (kbps)

• Unreserved bandwidth (Priority 3) (kbps)

• Unreserved bandwidth (Priority 4) (kbps)

• Unreserved bandwidth (Priority 5) (kbps)

• Unreserved bandwidth (Priority 6) (kbps)

• Unreserved bandwidth (Priority 7) (kbps)

• Link ID

Click on the OK button. The IGP History Topology map opens.

Right-click on the map and choose Compare.

Choose one of the following from the contextual menu:

• OSPF—to compare OSPF checkpoints

  The OSPF - Checkpoint form opens.

• ISIS—to compare ISIS checkpoints

  The ISIS - Checkpoint form opens.

Choose a checkpoint A, if necessary. By default, Checkpoint A is configured with the closest checkpoint to the start time within the interval.

1. Click on the Select button next to the Checkpoint A parameter. The Select Object A form opens.

2. Specify a filter for the search, if required, and click on the Search button. A list of checkpoints appears.

3. Select a checkpoint and click on the OK button. The Select Object A form closes.

Perform one of the following:

1. Choose a checkpoint B, if necessary. Go to Step 12 .

2. Enable the ...OR Compare With Current Topology checkbox. Go to Step 14 .

Choose a checkpoint B, if necessary. By default, Checkpoint B is configured with the closest checkpoint to the end time within the interval.

1. Click on the Select button next to the Checkpoint B parameter. The Select Object B form opens.

2. Specify a filter for the search, if required, and click on the Search button. A list of checkpoints that exist in the same IGP administrative domain as the checkpoint selected for Object A appears.

3. Select a checkpoint entry and click on the OK button. The Select Object B form closes.

You can click on the Swap button at any time to change the order of the selected checkpoints. For example, when you click on the Swap button, Checkpoint A becomes Checkpoint B, and Checkpoint B becomes Checkpoint A. Checkpoint B is compared against Checkpoint A.

Enable the following parameters, as required:

• Include Only Differences — specifies whether, in a checkpoint comparison operation, only the differences between the two checkpoints being compared are listed.

• Include Only Specified Classes — specifies whether, in a checkpoint comparison operation, only the differences between specific attributes of the two checkpoints being compared are listed.

• Configure Link Specific Filters—specifies whether, in a checkpoint comparison operation, specified link differences and link properties are included in the comparison of the two checkpoints.The Configure Link Specific Filters parameter is configurable only if the Include Only Differences option is disabled. You must enable the Configure Link Specific Filters parameter to configure the filter.

  • Include/Exclude All Link Differences—specifies whether all of the link differences are included or excluded.

  • Include/Exclude All Link Properties—specifies whether all of the link properties are included or excluded.

Note: You can choose any combination of link differences and link properties to be included in the comparison. If you choose more than one difference or property, the CPAM uses an OR filter for the comparison.

When you enable the Include Only Specified Classes option, you can include the following classes in the OSPF checkpoint comparison:

• Area

• OSPF Link

• OSPF Subnet

• Router

When you enable the Include Only Specified Classes option, you can include the following classes in the ISIS checkpoint comparison:

• Area

• ISIS Link

• ISIS Subnet

• Router

When you enable the Configure Link Specific Filters option, you can include or exclude the following link differences in the checkpoint comparison:

You can enable the Configure Link Specific Filters option only if the Include Only Differences option is disabled.

When you enable the Configure Link Specific Filters option, you can include or exclude the following link properties in the checkpoint comparison:

• Operational state

• Operational state change counter

• Metric

• Metric change counter

• Administrative groups

• Administrative groups change counter

• TE metric

• TE metric change counter

• SRLG values

• SRLG change counter

• Maximum bandwidth (kbps)

• Unreserved bandwidth (Priority 0) (kbps)

• Unreserved bandwidth (Priority 1) (kbps)

• Unreserved bandwidth (Priority 2) (kbps)

• Unreserved bandwidth (Priority 3) (kbps)

• Unreserved bandwidth (Priority 4) (kbps)

• Unreserved bandwidth (Priority 5) (kbps)

• Unreserved bandwidth (Priority 6) (kbps)

• Unreserved bandwidth (Priority 7) (kbps)

• Link ID

You can enable the Configure Link Specific Filters option only if the Include Only Differences option is disabled.

Click on the Compare button. A list of differences between the two checkpoints appears. Differences are identified in the Differences column and identified by a color:

• Property Change (blue) — property change to the object identified in the Class Name column

• Missing (pink) — object identified in the Class Name column exists in checkpoint object A and not in checkpoint object B

• Added (green) — object identified in the Class Name column exists in checkpoint object B and not in checkpoint object A

• No change (white) — there are no configuration changes between checkpoint object A and checkpoint object

Choose an entry and click on the Properties button to view additional details about the difference. The Difference - Checkpoint (checkpointed object)object A to object B form appears displaying a list of property changes.

Click on an entry to view information about the differences in the panel on the right.

Click on the OK button to close the form.

Close the Compare - Checkpoint form.

Close the IGP History Topology map.

End of steps