blocks|key|3381965|text|您需要在while循环之外创建、连接和关闭连接。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3381966|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You need to create, connect and close connection outside the while loop.

blocks|key|1314845|text|您的循环就是这样做的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1314846|ssh+=+paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('192.168.221.235',+username='nuts',+password='cisco',+timeout+=++30)
while+True:
++++++cisco_cmd+=+raw_input("Enter+cisco+router+cmd:")
++++++stdin,+stdout,+stderr+=+ssh.exec_command(cisco_cmd)
++++++print+stdout.read()
++++++if++cisco_cmd+==+'exit':+break
ssh.close()|code-block|syntax|javascript|1314847|将初始化和设置移出循环。编辑:+Moved+close()|1314848|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Your loop does that

<pre><code>ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('192.168.221.235', username='nuts', password='cisco', timeout = 30)
while True:
 cisco_cmd = raw_input("Enter cisco router cmd:")
 stdin, stdout, stderr = ssh.exec_command(cisco_cmd)
 print stdout.read()
 if cisco_cmd == 'exit': break
ssh.close()
</code></pre>

Move the initialisation and setup outside the loop.
EDIT: Moved close()

blocks|key|4982484|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4982485|当我需要配置模式时，上面的程序不能工作，因为ssh会话没有被重用|blockquote|4982486|4982487|4982488|一旦您将connect和close移到循环之外，您的ssh会话就会被重用，但是每个exec_command()都发生在一个新的shell中(通过一个新的通道)，并且是不相关的。您需要格式化您的命令，以便它们不需要来自shell的任何状态。|offset|length|style|CODE|4982489|如果我没记错的话，有些Cisco设备只允许一个exec，然后关闭连接。在这种情况下，您将需要使用invoke_shell()，并使用pexpect模块(您已经导入了该模块，但没有使用它)以交互方式工作。|4982490|entityMap^0|0|0|0|0|4|7|C|5|15|E|0|1C|E|1U|7|0^^$0|@$1|2|3|-4|4|5|6|P|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|Q|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|R|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|S|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|T|7|@$H|U|I|V|J|K]|$H|W|I|X|J|K]|$H|Y|I|Z|J|K]]|8|@]|9|$]]|$1|L|3|M|4|5|6|10|7|@$H|11|I|12|J|K]|$H|13|I|14|J|K]]|8|@]|9|$]]|$1|N|3|-4|4|5|6|15|7|@]|8|@]|9|$]]]|O|$]]

<blockquote>
 The above program does not work when I
 need to configuration mode because ssh
 session is not reused
</blockquote>

Your ssh session will be reused once you move the <code>connect</code> and <code>close</code> outside of the loop, but each <code>exec_command()</code> happens in a new shell (through a new channel), and are unrelated. You will need to format your commands so that they don't require any state from the shell.

If I remember correctly, some Cisco devices only allow a single exec, and then close the connection. In that case, you will need to use <code>invoke_shell()</code>, and work interactively using the <code>pexpect</code> module (which you already have imported, but aren't using).

blocks|key|2007749|text|我使用了Exscript而不是paramiko，现在我可以在IOS设备上获得持久会话。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2007750|#!/opt/local/bin/python
import+hashlib
import+Exscript

from+Exscript.util.interact+import+read_login
from+Exscript.protocols+import+SSH2

account+=+read_login()++++++++++++++#+Prompt+the+user+for+his+name+and+password
conn+=+SSH2()+++++++++++++++++++++++#+We+choose+to+use+SSH2
conn.connect('192.168.221.235')+++++#+Open+the+SSH+connection
conn.login(account)+++++++++++++++++#+Authenticate+on+the+remote+host
conn.execute('conf+t')++++++++++++++#+Execute+the+"uname+-a"+command
conn.execute('interface+Serial1/0')
conn.execute('ip+address+114.168.221.202+255.255.255.0')
conn.execute('no+shutdown')
conn.execute('end')
conn.execute('sh+run+int+Serial1/0')
print+conn.response

conn.execute('show+ip+route')
print+conn.response

conn.send('exit\r')+++++++++++++++++#+Send+the+"exit"+command
conn.close()++++++++++++++++++++++++#+Wait+for+the+connection+to+close|code-block|syntax|javascript|2007751|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I used Exscript instead of paramiko and I am now able to get persistent session on IOS device.

<pre><code>#!/opt/local/bin/python
import hashlib
import Exscript

from Exscript.util.interact import read_login
from Exscript.protocols import SSH2

account = read_login() # Prompt the user for his name and password
conn = SSH2() # We choose to use SSH2
conn.connect('192.168.221.235') # Open the SSH connection
conn.login(account) # Authenticate on the remote host
conn.execute('conf t') # Execute the "uname -a" command
conn.execute('interface Serial1/0')
conn.execute('ip address 114.168.221.202 255.255.255.0')
conn.execute('no shutdown')
conn.execute('end')
conn.execute('sh run int Serial1/0')
print conn.response

conn.execute('show ip route')
print conn.response

conn.send('exit\r') # Send the "exit" command
conn.close() # Wait for the connection to close
</code></pre>

I have search on this site and multiple other locations but I have been unable to resolve my problem of connecting and maintaining ssh session after one command. Below is my current code:

<pre><code>#!/opt/local/bin/python

import os 

import pexpect

import paramiko

import hashlib

import StringIO

while True:

 cisco_cmd = raw_input("Enter cisco router cmd:")

 ssh = paramiko.SSHClient()

 ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

 ssh.connect('192.168.221.235', username='nuts', password='cisco', timeout = 30)

 stdin, stdout, stderr = ssh.exec_command(cisco_cmd)

 print stdout.read()

 ssh.close()

 if cisco_cmd == 'exit': break
</code></pre>

I can run multiple commands but for every commands a new ssh session is created.
The above program does not work when I need to configuration mode because ssh session 
is not reused.Any assistance in resolving this matter is greatly appreciated.

Persistent ssh session to Cisco router

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我已经在这个站点和多个其他位置进行了搜索，但我无法解决在执行一条命令后连接和维护ssh会话的问题。下面是我当前的代码：#!/opt/local/bin/pythonimport os  import pexpectimport paramikoimport hashlibimport StringIOwhile Tru...

问到Cisco路由器的持久ssh会话
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