10.31 extended configuration of static route

Extended configuration of static routing ：

1、 Loopback interface – On the equipment for testing TCP/IP Whether the protocol stack can work properly , Default does not exist , It needs to be configured manually
[r1]interface LoopBack 1 // Create loopback interface
[r2-LoopBack1]ip address 10.1.1.1 24

2、 Manual summary – Go to multiple network segments that can be summarized , And have the same next hop time , It can be written directly as
Aggregate routing .
[r2]ip route-static 10.1.0.0 22 172.16.32.1
Summarize the target network segment

3、 Routing black holes – After the summary , The summary network segment will contain networks that do not exist in the network , Cause the flow to have no return

4、 Default route – A routing entry that does not specify a specific target network range , Target use 0.0.0.0/0 Instead of , commonly
When the router queries the routing table , First check the direct connection route , Recheck the static route 、 Dynamic routing , If you still haven't gone
The path of the goal , Select this default route entry

5、 Empty interface routing – Configure the empty interface route of the summary network segment on the black hole router , Prevent routing black holes & The loop brought by the default route
[r1]ip route-static 10.1.0.0 22 NULL 0
Empty interface

、 Floating static routing
route flage;

Static routing table status :
Destinations : 0 Routes : 0

Pre: priority , Range 0-255, The default priority of static routing is 60, Indicates the reliability of a path , The smaller the number is.
The more credible

Cost： expenses （ measurements ）, Measure the pros and cons of a path , The smaller the number, the better

Go to a target network segment , If there are multiple paths available , The priority of these paths will be checked first , Xiaoyou ; If the priority is the same
Check it again Cost, Xiaoyou ; If it's still the same , Then all the paths are loaded into the routing table , Load balancing .
[r3]ip route-static 172.16.64.0 19 192.168.1.1 preference 100
priority