H3C S9500 Series Operation Manual

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Contents

Operation Manual – Routing ProtocolH3C S9500 Series Routing Switches Chapter 4 OSPF Configuration4-25physical interfaces, you can also configure various interface parameters on this link,such as hello timer.The "logic channel" means that the routers running OSPF between two ABRs only takethe role of packet forwarding (the destination addresses of the protocol packets are notthese routers, so these packets are transparent to them and the routers forward themas common IP packets). The routing information is directly transmitted between the twoABRs. The routing information herein refers to the Type-3 LSAs generated by the ABRs,for which the synchronization mode of the routers in the area will not be changed.Perform the following configuration in OSPF area view.Table 4-30 Configure an OSPF virtual linkOperation CommandCreate and configure a virtuallinkvlink-peer router-id [ hello seconds | retransmitseconds | trans-delay seconds | dead seconds |simple password | md5 keyid key ]*Remove the created virtual link undo vlink-peer router-idBy default, the value of hello seconds is 10 seconds, the value of retransmit seconds is5 seconds, the value of trans-delay seconds is 1 second, and the value of deadseconds is 40 seconds.4.2.21 Configuring Stub Area of OSPFStub areas are some special areas, in which the ABRs do not propagate the learnedexternal routes of the AS.The stub area is an optional configuration attribute, but not every area conforms to theconfiguration condition. Generally, stub areas, located at the AS boundaries, are thosenon-backbone areas with only one ABR. Even if this area has multiple ABRs, no virtuallinks are established between these ABRs.To ensure that the routes to the destinations outside the AS are still reachable, the ABRin this area will generate a default route (0.0.0.0) and advertise it to the non-ABRrouters in the area.Pay attention to the following items when configuring a stub area:z The backbone area cannot be configured to be the stub area and the virtual linkcannot pass through the stub area.z If you want to configure an area to be the stub area, then all the routers in this areashould be configured with this attribute.z No ASBR can exist in a stub area. In other words, the external routes of the AScannot be propagated in the stub area.Perform the following configuration in OSPF area view.