自己搭建自动化巡检系统（三） 通过telnet实现远程创建loopback

我们在上一章完成了用代码操作telnet，实现了远程控制，分析前面的代码会发现健壮性太低，需要进行优化，后续会通过开发一个交互式界面来完成人工介入操作网络的过程。本次实验目的：实现自动化创建环回口

首先更新拓扑，拉出新的路由器和一台交换机

import telnetlib
import time
def main():
	Host="192.168.10.100"
	username="yerik"
	password="1111"
	commends=['enable','2222','conf t']#相关指令
	
	tn = telnetlib.Telnet(Host,port=23,timeout=10)
	tn.set_debuglevel(2)

	# login input username
	
	tn.read_until('Username: ') # 期待回复
	tn.write(username+'\n')

	# input password
	tn.read_until('Password: ') # 期待回复
	tn.write(password+'\n')

	tn.read_until('R1>')
	for commend in commends:
		tn.write("%s\n" % commend)
	'''
	tn.read_until('R1#')
	tn.write('configure')
	time.sleep(1)
	tn.write('t')'''

	tn.read_until('R1(config)#')
	loopback = 'int lo'
	ipaddr = ' 255.255.255.255'
	exit = 'exit'
	for i in range(1,5):
		loopbackn=loopback+str(i)
		time.sleep(1)
		tn.write("%s\n" % loopbackn)
		ipaddrn='ip add '+str(i)+'.'+str(i)+'.'+str(i)+'.'+str(i)+ipaddr
		time.sleep(1)
		tn.write("%s\n" % ipaddrn)
		time.sleep(1)
		tn.write("%s\n" % exit)
	tn.close()

if __name__=='__main__':
	main()

发现已经创建成功了

由于此时还没有运行路由协议，请问有什么办法可以ping到这些环回口？使用ping中的严格源站路由技术，通过R2pingR1 在特权界面中，输入ping

ping
Protocol [ip]:
Target IP address: 2.2.2.2
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 192.168.10.102
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:Strict
Source route: 192.168.10.101
Loose, Strict, Record, Timestamp,Verbose[SV]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2,timeout is 2 seconds:
Packet sent with a source address of192.168.10.102
Packet has IP options:  Total option bytes= 7, padded length=8
 Strict source route: <*>
  (192.168.10.101)
 
Reply to request 0 (20 ms).  Received packet has options
 Total option bytes= 8, padded length=8
 Strict source route:
  (192.168.10.101)
  <*>
 Endof list
 
Reply to request 1 (28 ms).  Received packet has options
 Total option bytes= 8, padded length=8
 Strict source route:
  (192.168.10.101)
  <*>
 Endof list
 
Reply to request 2 (24 ms).  Received packet has options
 Total option bytes= 8, padded length=8
 Strict source route:
  (192.168.10.101)
  <*>
 Endof list
 
Reply to request 3 (16 ms).  Received packet has options
 Total option bytes= 8, padded length=8
 Strict source route:
  (192.168.10.101)
  <*>
 End oflist
 
Reply to request 4 (28 ms).  Received packet has options
 Total option bytes= 8, padded length=8
 Strict source route:
  (192.168.10.101)
  <*>
 Endof list
 
Success rate is 100 percent (5/5),round-trip min/avg/max = 16/23/28 ms

现实可以ping通