查找IP连接在交换机的哪个端口

import  telnetlib

def get_mac():
coreip='三层交换机IP'
#    try:
tel = telnetlib.Telnet(coreip)
tel.read_until('Username:')
tel.write('三层交换机账号'+'\n')
tel.read_until('Password:')
tel.write('三层交换机密码'+'\n')
tel.read_until('>')
tel.write('ping ' + s_ip +'\n')
#        data = tel.read_until('>')
tel.read_until('>')
tel.write('dis arp | in ' + s_ip +'\n')
data = tel.read_until('>')
data = data.split()
print data[16]
mac = data[16]
return mac

#    except: print 'bad'

def get_port():
#    try:
tel = telnetlib.Telnet(ip)
tel.read_until('Username:')
tel.write('账号'+'\n')
tel.read_until('Password:')
tel.write('密码'+'\n')
tel.read_until('>')
tel.write('dis mac-add ' + mac +'\n')
raw_data = tel.read_until('>')
print '*************** connect to ========>>',ip
if 'XGE' not in raw_data :
#            print raw_data
data = raw_data.split()
#            print data
if 'GE' in data[12] :
print raw_data
#    except:print 'can not connect to %s\n' %ip

while True:
ipfile = open('swiplist.txt')
ipall  = [ ip.strip('\n') for ip in ipfile.readlines() ]
s_ip = raw_input('input ip add ,such as => 192.168.0.1 \n >')

mac = get_mac()
for ip in ipall:
get_port()
words = raw_input("input 'yes' to run again, input any key to exit:")
if words !='yes':break