OSPFv3 topology overview

Introduction to CPAM OSPFv3 topology

The OSPFv3 topology map displays all of the OSPFv3-enabled routers and OSPFv3 links that are discovered by the CPAAs. The discovery is independent of the discovery of routers that are managed or manageable by the NFM-P.

Routers

See Routers in the OSPF topology overview section for information about routing icons and contextual menu options on the OSPFv3 topology map.

Subnet objects

See Subnet objects in the OSPF topology overview section for information about subnet objects on the OSPFv3 topology map.

Links

The CPAM supports the following OSPFv3 links:

point-to-point
broadcast
virtual

A point-to-point OSPFv3 link is a logical unidirectional link between OSPFv3 interfaces.

For OSPFv3 links in a broadcast subnet, the link begins on the first router and terminates on a subnetwork. There is a duplicate link in the opposite direction, from the subnetwork to another router. The duplicate link always has a metric and bandwidth of 0. Broadcast links are used when the routers are connected using an Ethernet network (hub or switch). A circle icon identifies Ethernet subnetwork configurations. A broadcast link uses one endpoint as a subnet and one endpoint as an OSPFv3 interface of a router.

The CPAM does not support non-broadcast multi-access links, such as frame relay or X.25.

The direction of a unidirectional OSPFv3 link is indicated by an arrow on the map. Two links between two interfaces are grouped into one link with no indication of direction. All of the links between two routers are grouped into one link group.

OSPFv3 virtual links are represented as very thin lines on the map. The CPAA cannot be an endpoint of a virtual link.

Routing areas

See Routing areas in the OSPF topology overview section for information about routing areas on the OSPFv3 topology map.

LSDB updates

You can retrieve the LSDB information from the CPAA to the database. See To update the LSDB for information.

If you enable the OSPFv3 protocol events flag of the CPAA, the CPAM ensures that the LSDB is up to date by using the following rules.

When the CPAA becomes operationally up and OSPFv3 events are currently enabled, the CPAM automatically retrieves the LSDB. This includes the start-up time of the CPAM.
When the CPAA is already operationally up and OSPFv3 events become enabled, the CPAM automatically retrieves the LSDB.

Router and network LSAs that are received by a CPAA are forwarded to the CPAM. A timestamp is added to each entry to facilitate future RCA. See Chapter 14, Root cause analysis for information about the CPAM and RCA.

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