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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, and PBR.

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Summary of OSPFv3 Configuration Tasks

Summary of OSPFv3 Configuration Tasks

After basic OSPFv3 functions are configured, you can build a basic OSPFv3 network. If other OSPFv3 functions are required, configure them according to reference sections. Table 6-6 describes the OSPFv3 configuration tasks.

Table 6-6 OSPFv3 configuration tasks




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.

In practical applications, establishing or maintaining OSPFv3 neighbor relationships is an important precondition for the construction of OSPFv3 networks. By implementing the configuration tasks in this section, you can:
  • Change the OSPFv3 packet timer to adjust the OSPFv3 network convergence rate and network load brought by protocol packets.

  • Configure the limit for OSPFv3 retransmission times. When retransmitting packets, OSPFv3 disconnects from its neighbor if the retransmission times exceed the limit. This prevents neighbors from dead loops caused by consecutive retransmission when the neighbor does not receive the packet.

  • Increase the OSPFv3 network convergence rate by adjusting the LSA updating and receiving intervals.

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: 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 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 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 dynamic host names

To facilitate network planning, configure OSPFv3 dynamic host names that are easy to memorize to identify routers.

Configuring an OSPFv3 Dynamic Hostname

Configuring OSPFv3 IP FRR

With the development of networks, Voice over IP (VoIP) and online video services require high-quality real-time transmission. Nevertheless, if an OSPFv3 fault occurs, it takes more than 50 ms to recover the link from the fault, which fails to meet the requirements for real-time services on the network.

Traditional OSPFv3 fault recovery requires the following processes to switch traffic to a new link: detecting the fault (at the millisecond level), reporting the fault to the routing control plane (at the millisecond level), generating and flooding new topology information (at the tens-of-milliseconds level), triggering SPF calculation (at the tens-of-milliseconds level), and notifying and installing a new route (at the hundreds-of-milliseconds level).

With the pre-calculated standby link, OSPFv3 IP FRR can quickly switch traffic to the standby link without interrupting the traffic when faults occur on the active link. This protects the traffic and greatly improves the OSPFv3 network reliability.

Configuring OSPFv3 IP FRR

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.

Configuring the OSPFv3 GR Helper

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

Updated: 2019-03-21

Document ID: EDOC1000166601

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