Topology references overview

Introduction to topology references

A reference determines the operational state of the real network, specifically for subnets and links.

The CPAM automatically sets a reference on all of the topology objects when an object is created or after a software upgrade. If topology objects exist from previous software versions, the topology objects are automatically referenced.

References on the topology maps

A topology reference is used to determine and track the existence of an object. Topology maps on the GUI are highlighted with colors to indicate the status of a link.

The following colors identify the links on the IGP and MPLS topology maps:

green for operationally up links that are added after a reference time
light green for referenced links that are operationally up
red for referenced links that are operationally down or have been removed (the adjacency between two router is removed)
white for groups that contain links with different colors. For example, a green and grey link. If there is a red link, the entire group is red.

The following color conventions are used on OSPF topology maps:

link colors are based on area, whether or not they are in the reference
red links are referenced links that are operationally down
white links are link groups that contain links from multiple areas. A red link makes the entire group red.

The following color conventions are used on ISIS topology maps:

link colors are based on level, whether or not they are in the reference
red links are referenced links that are operationally down
white links are link groups that contain links from multiple levels. A red link makes the entire group red.

The NFM-P database continues to store information for the reference link after it has been removed from the LSDB. Although the link is displayed in red, the original color of the link reappears after the link is rediscovered by the CPAA. The state of the router is not indicated by a color.

Topology reference functions

The following table describes the CPAM reference functions:

Table 6-1: CPAM reference functions

Function	Description
Cleanup Reference→All ISIS Domains	References are maintained for all of the links, routers, and areas that are operationally up within ISIS routing domains in an IGP administrative domain. All operationally down objects are removed from the topology map.
Cleanup Reference→All OSPF Areas	References are maintained for all of the links, routers, and areas that are operationally up within OSPF areas in an IGP administrative domain. All operationally down objects are removed from the topology map.
Cleanup Reference→All	References are maintained for all of the links, routers, and areas that are operationally up in all of the ISIS routing domains and OSPF areas in an IGP administrative domain. All operationally down objects are removed from the topology map.

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