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add implement HSRP using ciscoconfparse example script
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‎create-hsrp-interface-configuration/cisco_ios_vlans.txt‎

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vlan 100
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name Data_100
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!
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vlan 201
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name Data_201
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!
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vlan 203
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name Data_203
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!
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vlan 204
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name Data_204
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!
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vlan 300
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name Server_300
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!
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vlan 301
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name Server_301
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!
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vlan 310
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name Server_310
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!
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vlan 320
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name Server_320
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!
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vlan 351
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name Server_351
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!
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vlan 352
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name Server_352
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!
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interface Vlan100
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ip address 10.0.100.1 255.255.255.0
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!
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interface Vlan201
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ip address 10.0.200.254 255.255.255.0
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!
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interface Vlan203
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ip address 10.0.203.1 255.255.255.0
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!
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interface Vlan204
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ip address 10.0.204.1 255.255.255.0
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!
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interface Vlan300
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ip address 10.10.0.128 255.255.255.0
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!
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interface Vlan301
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ip address 10.10.1.1 255.255.255.0
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!
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interface Vlan310
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ip address 10.10.10.1 255.255.255.0
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!
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interface Vlan320
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ip address 10.10.20.126 255.255.255.128
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!
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interface Vlan351
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ip address 10.10.51.126 255.255.255.128
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!
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interface Vlan352
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ip address 10.10.52.126 255.255.255.128
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!

‎create-hsrp-interface-configuration/create-hsrp-interface-configuration.py‎

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import os
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import sys
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from ipaddress import IPv4Network
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from ciscoconfparse import CiscoConfParse
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from ciscoconfparse.ccp_util import IPv4Obj
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output_directory = "_output"
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input_configuration_file = "cisco_ios_vlans.txt"
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primary_configuration_file = "primary_config.txt"
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secondary_configuration_file = "secondary_config.txt"
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if __name__ == "__main__":
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# just make sure that the output directory exists
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if not os.path.exists(output_directory):
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os.mkdir(output_directory)
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# load the input Cisco IOS configuration file
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print("load Cisco IOS configuration file...")
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try:
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parsed_config = CiscoConfParse(input_configuration_file)
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except Exception as ex:
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print(ex)
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sys.exit()
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# create objects for diff
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print("create primary and secondary configuration object...")
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primary_config = CiscoConfParse([
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"!",
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"! primary switch interface configuration",
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"!",
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])
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secondary_config = CiscoConfParse([
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"!",
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"! secondary switch interface configuration",
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"!",
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])
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# read all VLAN SVI's which has an ip address
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vlan_interfaces = parsed_config.find_objects_w_child("^interface Vlan", r"^ ip address.*")
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for vlan_interface in vlan_interfaces:
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# determine current ip address
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ipv4_addr = vlan_interface.re_match_iter_typed(r"ip\saddress\s(\S+\s+\S+)", result_type=IPv4Obj)
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# determine the current interface name and VLAN ID
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vlan_interface_string = vlan_interface.text.lstrip("interface ")
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vlan_id = vlan_interface_string.lstrip("Vlan")
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# the current SVI address is used as a HSRP virtual IP
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virtual_ip = ipv4_addr.ip_object
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# at this point we need to determine the next addresses which are used for the primary and secondary switch
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# we will try, if the next two addresses are part of the network, otherwise we will use the previous two
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# addresses
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ipv4_network = IPv4Network(ipv4_addr.network)
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if (ipv4_addr.ip_object + 1) in ipv4_network.hosts():
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primary_ip = ipv4_addr.ip_object + 1
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secondary_ip = ipv4_addr.ip_object + 2
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else:
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primary_ip = ipv4_addr.ip_object - 1
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secondary_ip = ipv4_addr.ip_object - 2
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# now add the configuration to the change scripts
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primary_config.append_line("interface %s" % vlan_interface_string)
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primary_config.append_line(" description *** VLAN SVI %s" % vlan_id)
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primary_config.append_line(" ip address %s %s" % (primary_ip, ipv4_addr.netmask))
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primary_config.append_line(" standby version 2")
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primary_config.append_line(" standby 1 ip %s" % virtual_ip)
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primary_config.append_line(" standby 1 priority 255")
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primary_config.append_line(" standby 1 authentication md5 key-string vl%s" % vlan_id)
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primary_config.append_line("!")
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secondary_config.append_line("interface %s" % vlan_interface_string)
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secondary_config.append_line(" description *** VLAN SVI %s" % vlan_id)
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secondary_config.append_line(" ip address %s %s" % (secondary_ip, ipv4_addr.netmask))
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secondary_config.append_line(" standby version 2")
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secondary_config.append_line(" standby 1 ip %s" % virtual_ip)
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secondary_config.append_line(" standby 1 priority 254")
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secondary_config.append_line(" standby 1 authentication md5 key-string vl%s" % vlan_id)
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secondary_config.append_line("!")
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# write results
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print("Write results...")
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primary_config.save_as(os.path.join(output_directory, primary_configuration_file))
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secondary_config.save_as(os.path.join(output_directory, secondary_configuration_file))

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