tailieunhanh - the best damn cisco internetworking book period phần 6

gỡ lỗi nên được sử dụng một cách tiết kiệm và đặc biệt. Sau đây là các lệnh debug được cụ thể để theo dõi OSPF, lấy trực tiếp từ Cisco IOS. Mỗi lệnh là tự giải thích. Chúng tôi sẽ đề cập đến debug ip ospf adj là lệnh tốt nhất để cô lập và giải quyết nguyên nhân của thất bại kề. | IP Routing Chapter 5 541 Link ID ADV Router Age 1581 1581 Seq Checksum 0x80000185 0x2C08 0x80000185 0x2112 debug Commands debug should be used sparingly and specifically. Following are the debug commands that are specific to OSPF monitoring taken directly from the Cisco IOS. Each command is self-explanatory. We will mention that debug ip ospf adjis the best command for isolating and resolving the cause of adjacency failures. Router1 debug ip ospf adj OSPF adjacency events database-timer OSPF database timer events OSPF events flood OSPF flooding hello OSPF hello events lsa-generation OSPF lsa generation packet OSPF packets retransmission OSPF retransmission events spf OSPF spf tree OSPF database tree Intermediate System to Intermediate System IS-IS IS-IS is the forgotten overlooked link state routing protocol. Its better-known cousin OSPF has all but eclipsed it. Further compounding the neglect of IS-IS is the fact that there are not as many sources of information about it as there are about OSPF. IS-IS is a link state routing protocol that is very similar to OSPF. This is no accident as the developers borrowed and improved on IS-IS when developing OSPF. IS-IS runs the Dijkstra algorithm to build a complete picture of the routing domain AS . Its backbone area area 0 is called the L2 area while all other areas are classified as L1 areas. IS-IS routes by area within the AS L2 routing and by the system ID within an area L1 routing . That is IS-IS uses the area address to determine how to reach the area and the system ID to reach a particular device once it gets to the destination area. Therefore it can be said that IS-IS routes on two levels area and station. There are two main flavors of IS-IS available one for CLNS-only routing and one for routing both CLNS and IP. The latter is officially called Integrated IS-IS by Cisco. While IS-IS was developed by the ISO to route CLNS it has been modified to route IP. Its modular .