HI Jigar,
I suspect this is way too late to be of use to you but thought I would toss it out in any case. I would urge you to look at the Netmiko module for python. Its a module by Kirk Byers based on the paramiko module with many "efficiencies" built it which makes it ideal for just what you are trying to do.
https://pynet.twb-tech.com/blog/automation/netmiko.html
The code excerpt below shows trying to log in, then trying to go into enable mode, then sending a command set which could very easily be your interface config snippet.
Hope this helps! Lots more good info on Kirk's Pynet site.
from netmiko import ConnectHandler
from netmiko import NetMikoAuthenticationException
from netmiko.ssh_exception import NetMikoTimeoutException
from paramiko.ssh_exception import SSHException
import sys
import getpass
try:
dev_conn = ConnectHandler(device_type=device_cls, ip=ip_addr, username=uname, password=upwd, secret=epwd)
login_success = True
except NetMikoAuthenticationException:
print "NetMikoAuthenticationException: Device failed to enter enable mode."
login_success = False
except (EOFError, SSHException, NetMikoTimeoutException):
print('SSH is not enabled for this device.')
login_success = False
except Exception, e:
print "General Exception: ERROR!:" + str(sys.exc_info()[0]) + "==>" + str(sys.exc_info()[1])
print str(e)
login_success = False
if login_success:
try:
dev_conn.enable()
enable_success = True
except Exception, e:
print str(e)
print "Cannot enter enter enable mode on device!"
enable_success = False
if enable_success:
output = dev_conn.send_config_set(commands)
dev_conn.exit_config_mode()
dev_conn.disconnect()
