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+## Create Custom DC Topology
+####   Basic computer configuration
+1.  CPU：Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz *48
+    
+    
+    
+2. Mem：
+   
+    ![2](./fig/2.png)
+    
+    
+####  Establish Topology In Mininet
+1.  The original situation of the server
+    
+    
+    
+    ![avatar](./fig/4.png)
+    
+2. Establish in Single Topology(one switch):OSError: [Errno 24] Too many open files.Memory Limit
+    ```
+    sdn@server03:~$ sudo mn --topo=single,10000
+    ```
+     ![avatar](./fig/5.png)
+    
+    ```
+    sdn@server03:~$ sudo mn --topo=single,1500
+    mininet> pingall
+    ```
+    
+    ![avatar](./fig/6.png)![](./fig/7.png)
+    
+3. Establish in linear Topology(There are probably more that can be started, but the upper limit is this order of magnitude,5000 hosts)
+
+    ```
+    sdn@server03:~$ sudo mn --topo=linear,2500,2
+    ```
+
+    
+
+    ![avatar](./fig/8.png)
+
+    ![avatar](./fig/8.png)
+
+4. Establish in Tree Topology. 343 vswitches and 5832 vhosts.
+
+    ```
+    sdn@server03:~$ sudo mn --topo=tree,depth=3,fanout=18
+    ```
+
+    
+
+    ![avatar](./fig/9.png)
+