Cisco SVI Sequence Generator

If you ever need to generate a large number of sequential SVI configuration, try this Python script.
It can be easily tweaked for physical interfaces instead of SVIs.

Usage:
./CONFIG_GEN.py {First SVI Number} {Base IP Address/CIDR} {IP Address Octet Number to Rotate} {Last SVI Number} [Additional Config Lines devided by ‘+’]

Examples:
./CONFIG_GEN.py 100 192.168.100.254/24 3 113
./CONFIG_GEN.py 13 10.13.1.254/16 2 17
./CONFIG_GEN.py 13 10.13.1.254/16 2 17 ‘no ip unreachables’
./CONFIG_GEN.py 13 10.13.1.254/16 2 17 ‘no ip unreachables+ip router ospf 1 area 0+no shut’

Result:
interface Vlan13
ip address 10.13.1.254 255.255.0.0
no ip unreachables
ip router ospf 1 area 0
no shut

interface Vlan14
ip address 10.14.1.254 255.255.0.0
no ip unreachables
ip router ospf 1 area 0
no shut

interface Vlan15
ip address 10.15.1.254 255.255.0.0
no ip unreachables
ip router ospf 1 area 0
no shut

interface Vlan16
ip address 10.16.1.254 255.255.0.0
no ip unreachables
ip router ospf 1 area 0
no shut

interface Vlan17
ip address 10.17.1.254 255.255.0.0
no ip unreachables
ip router ospf 1 area 0
no shut

#!/usr/bin/python # csgen - Cisco SVI Sequence Configuration Generator # (CC0) No Rights Reserved # Artiom Lichtenstein # v1.2, 29/04/2013 import sys def fun_PRINT_INSTRUCTIONS(): print "\nUsage: ./csgen {First SVI Number} {Base IP Address/CIDR} {IP Address Octet Number to Rotate} {Last SVI Number} [Additional Config Lines devided by '+']" print "Examples:" print "./csgen 100 192.168.100.254/24 3 113" print "./csgen 13 10.13.1.254/16 2 17" print "./csgen 13 10.13.1.254/16 2 17 'no ip unreachables'" print "./csgen 13 10.13.1.254/16 2 17 'no ip unreachables+ip router ospf 1 area 0+no shut'\n" if (len(sys.argv) < 5) or (int(sys.argv[1])>int(sys.argv[4])) or (int(sys.argv[3])>4): fun_PRINT_INSTRUCTIONS() # Print usage instructions when there are not enough arguments or arguments are invalid sys.exit(1) int_FIRST_SVI = int(sys.argv[1]) str_IP_AND_MASK = sys.argv[2] int_ACTIVE_OCTET = int(sys.argv[3])-1 int_LAST_SVI = int(sys.argv[4]) lst_IP_AND_MASK = str_IP_AND_MASK.split("/") # IP Address and Mask separation lst_OCTETS = lst_IP_AND_MASK[0].split(".") # IP Octets separation str_MASK = lst_IP_AND_MASK[1] str_BINARY_MASK = "" for i in range (0,32): # Create a binary representation of the CIDR Mask if i < int(str_MASK): str_BINARY_MASK = str_BINARY_MASK + "1" else: str_BINARY_MASK = str_BINARY_MASK + "0" if (i==7) or (i==15) or (i==23): str_BINARY_MASK = str_BINARY_MASK + "." lst_MASK_OCTETS = str_BINARY_MASK.split(".") # Separate the Mask Octets for i in range (int_FIRST_SVI, int_LAST_SVI+1): print "\ninterface Vlan" + str(i) print " ip address " + lst_OCTETS[0] + "." + lst_OCTETS[1] + "." + lst_OCTETS[2] + "." + lst_OCTETS[3] + " " + str(int(lst_MASK_OCTETS[0],2)) + "." + str(int(lst_MASK_OCTETS[1],2)) + "." + str(int(lst_MASK_OCTETS[2],2)) + "." + str(int(lst_MASK_OCTETS[3],2)) lst_OCTETS[int_ACTIVE_OCTET] = str(int(lst_OCTETS[int_ACTIVE_OCTET])+1) if ( (int_ACTIVE_OCTET==3) and (int(lst_OCTETS[int_ACTIVE_OCTET])==255) or (int_ACTIVE_OCTET!=3) and (int(lst_OCTETS[int_ACTIVE_OCTET])==256) ): sys.exit("\nNo more addresses available for the Rotating IP Octet!\n") if len(sys.argv)==6: lst_STATIC_LINES = sys.argv[5].split("+") for j in range (0,len(lst_STATIC_LINES)): print " " + lst_STATIC_LINES[j] print

1 thought on “Cisco SVI Sequence Generator”

Great work man! Always love your work. Thanks.

SharonTools

1 thought on “Cisco SVI Sequence Generator”

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