CLI-based Configuration Guide - IP Unicast Routing

Constructing a basic OSPFv3 network

Before configuring OSPFv3, you must enable the OSPFv3 process and specify the router ID. Other OSPFv3 functions then can be configured or take effect.

• Configuring Basic OSPFv3 Functions

• Establishing or Maintaining OSPFv3 Neighbor Relationship

Configuring OSPFv3 special area attributes

After the basic OSPFv3 network is constructed, OSPFv3 special area attributes can be flexibly used to deploy the OSPFv3 network according to actual needs.

• OSPFv3 stub area: A stub area is a special area where ABRs do not advertise the received external routes. In a stub area, the device routing table size and routing information in transmission are greatly reduced. To ensure the reachability of a destination outside the AS, the ABR in the stub area generates a default route and advertises it to the non-ABR routers in the stub area.

• OSPFv3 NSSA area: An NSSA is also a special area that resembles a stub area in many ways. The difference between the two areas is that the NSSA area can introduce and advertise routes outside the AS to the entire OSPF AS, without learning external routes sent from other areas on the OSPF network.

• OSPFv3 virtual link: All the non-backbone areas need to be connected to the backbone area in the OSPFv3 deployment. Otherwise, some areas will be unreachable. However, in actual applications, physical connectivity between the non-backbone area and backbone area cannot be ensured because of various limitations. In this case, OSPFv3 virtual links can be configured between the ABRs in the new non-backbone area and those in the backbone area.

• Configuring OSPFv3 Areas

• Configuring OSPFv3 NSSAs

Configuring OSPFv3 route attributes

In practical applications, to meet the requirements of complex network environment, configure the OSPFv3 route attributes to change the OSPFv3 route selection policies.

Configuring OSPFv3 Route Attributes

Controlling OSPFv3 routing information

In practical applications, to meet the network requirements, configure filtering of received and advertised routes and route aggregation, and control the number of external routes from the LSDB to implement accurate control of OSPFv3 routing information.

Controlling OSPFv3 Routing Information

Adjusting and optimizing OSPFv3 networks

Change the OSPFv3 packet timer to adjust the OSPFv3 network convergence rate and network load brought by protocol packets. On some low-rate links, the delay of LSA transmission by interfaces must be considered. Adjust the SPF calculation interval to restrict resource consumption caused by frequent network changes.

Optimizing an OSPFv3 Network

Configuring OSPFv3 GR

To prevent route flapping and interruption of traffic forwarding caused by OSPFv3 restart, enable the OSPFv3 GR features.

After OSPFv3 is restarted, the GR Restarter and the GR Helper re-establish the neighbor relationship, exchange routing information, synchronize the database, and update the routing table and forwarding table. This implements OSPFv3 fast convergence.

Configuration OSPFv3 GR

Improving OSPFv3 network security

Improving OSPFv3 Network Security

Configuring the OSPFv3 network management function

OSPFv3 supports the network management function. You can bind OSPFv3 MIB to a process. In addition, OSPFv3 also supports fault and log functions.

Configuring the Network Management Function of OSPFv3