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OSPF - virtual link details (including configuration commands)
2022-07-01 09:10:00 【Gucheng 286】
One 、ospf Introduction to virtual link :
Virtual connection is between two ABR Between , Through a non backbone area ( Conversion area ——Transit Area), A logical connection channel established , It can be understood as two ABR There is a point-to-point connection between .“ Logical channels ” It means two ABR Between multiple machines OSPF Of Router Just play a forwarding role message The role of ( Because the destination address of the protocol message is not these routers , So these messages are transparent to them , Just as normal IP Message to forward ), Two sets of ABR Directly transfer routing information between . The routing information here refers to the routing information provided by ABR Generated type3 Of LSA, In the area Router The synchronization mode has not changed .
Two 、 Virtual connection (Virtual-link):
Due to the complex topology of the network , Sometimes it is impossible to meet the requirement that each area must be directly connected with the backbone area , To solve this problem ,OSPF The concept of virtual link is proposed .
Virtual connection is set in two Router Between , Both routers have a port connected to the same non backbone area . Virtual connections are considered to belong to the backbone area , stay OSPF Routing protocol seems , Virtual connection between two ends Router By a Point to point Links are connected together . stay OSPF route Agreement , The routing information through virtual connection is regarded as the origin of intra domain routing .
3、 ... and 、 Command analysis :
Router(config)#router ospf 100
Router(config-router)#area transit area-id virtual-link router-id
- stay OSPF Of Routing In configuration mode ,
- Transit area-id : Area number of conversion area
- Router-id : Virtual connection to the destination route ID
- Two ABR All of them need to be configured .
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