Question

我试图通过paramiko配置cisco路由器。首先，我ssh到路由器，然后运行命令。但是当我连接到路由器时，我无法进入配置模式。我的意思是路由器以用户模式连接并运行en或conf t不起作用！

conn = paramiko.SSHClient()
conn.set_missing_host_key_policy(paramiko.AutoAddPolicy())
conn.connect("20.0.0.1", 22, "cisco", "123")
stdin, stdout, stderr = conn.exec_command('show ip int br')
status = stdout.channel.exit_status_ready()
if status==0:
 mystring = stdout.read()
 print mystring

状态为0，但mystring为空字符串。（结果为：[]）

我在Fedora 20上。

由于

Answer 1

您的上述命令适用于Cisco 881（即'show ip int br'正常运行并播放输出。

如果我添加第二个命令，例如'conf t'或'enable'则会失败。这是因为Cisco上的exec_command只允许一个命令。您需要运行.invoke_shell（）方法来执行多个命令。

以下是一个例子：

import paramiko
from getpass import getpass
import time

ip = raw_input("Please enter your IP address: ")
username = raw_input("Please enter your username: ")
password = getpass()

remote_conn_pre=paramiko.SSHClient()
remote_conn_pre.set_missing_host_key_policy(paramiko.AutoAddPolicy())
remote_conn_pre.connect(ip, port=22, username=username,  
                        password=password,
                        look_for_keys=False, allow_agent=False)

remote_conn = remote_conn_pre.invoke_shell()
output = remote_conn.recv(65535)
print output

remote_conn.send("show ip int brief\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print output

remote_conn.send("conf t\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print output

remote_conn.send("end\n")
time.sleep(.5)
output = remote_conn.recv(65535)
print output

您可能还想查看我一直在处理的这个库。它简化了一些这些机制：

https://pynet.twb-tech.com/blog/automation/netmiko.html

Answer 2

注意：确保在Cisco交换机上启用ssh。我使用了思科VIRL ISO。还要根据您的ssh更改用户名和密码。

import paramiko
import time
def attempt():

    IP = "192.168.0.52"
    USER = "cisco"
    Password = "cisco"
    PORT=22
      
    try:

        ssh = paramiko.SSHClient()
        #ssh.load_system_host_keys()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
 
        try:
            ssh.connect(IP , port=PORT, username=USER, password=Password)
            print ("Connected successfully.")

            connection = ssh.invoke_shell()
            connection.send("enable\n")
            time.sleep(.5)
            connection.send("cisco\n")
            time.sleep(.5)
           #connection.send("conf t\n")
            connection.send("show ip int brief\n")
            #connection.send("int loop 2\n")
           #connection.send("ip address 2.3.1.1 255.255.255.255\n")
            
            time.sleep(.5)
            router_output = connection.recv(65535)
            time.sleep(.5)
            print("\n\n")
            print(str(router_output) + "\n")
            time.sleep(.5)

            connection.send("end\n")

        except paramiko.AuthenticationException:
            print ("Incorrect password: "+Password)

        except socket.erro:
            print ("Socket Error")
    except:
        print("Something Went Wrong")

通过paramiko配置cisco路由器

2 个答案: