BGP Prefix Limit Configuration in Cisco, Juniper and Nokia - Interop

BGP Prefix Limit

Maximum Prefix-limit is used to control the BGP peer not to overload your BGP routing table and it helps to avoid the situation. let's explore how to configure in Cisco, Juniper, and Nokia router

Cisco Configuration

 !

router bgp 300

 neighbor 192.168.1.1

  address-family ipv4 unicast

   maximum-prefix <max-limit> <percentage> <Actions>

  !

 !

Juniper  Configuration

edit protocol
bgp {
        group nokia {
            neighbor 192.168.0.1 {
                family inet {
                    unicast {
                        prefix-limit {
                            maximum 1000;
                            teardown;
                        }
                    }

Nokia Configuration

/configure router bgp

            group "juniper"

                type external

                local-as 100

                neighbor 192.168.0.2

                    prefix-limit <family> <prefix-limit>

                    peer-as 200

                exit

   

How to add Cisco IOU Image on Eve-ng Up and Running

Step 1#

Download Linux L2/L3 adventerprise Image 

Step 2#

Upload the downloaded image to the EVE path /opt/unetlab/addons/iol/bin/ using WinSCP or Filezilla

Step 3#

Fix the permission for the added image using the below command

/opt/unetlab/wrappers/unl_wrapper -a fixpermissions

Step 4#

Create an iou keygen file Copy the Cisco IOU Image Script provided below and add to the script

vim /opt/unetlab/addons/iol/bin/ioukeygen.py

Esc:wq

Step 5#

Fix the permission for the Python script

chmod –x vim /opt/unetlab/addons/iol/bin/ioukeygen.py

Step 6#

Run the license generator script 

/opt/unetlab/addons/iol/bin/ioukeygen.py

copy the license generated by the script

Step 7#

Create iourc license file for your EVE

vim /opt/unetlab/addons/iol/bin/iourc

Paste the output captured in Step 6

Step 8#

Fix the permission and start practicing your lab by adding the image on eve-ng web

/opt/unetlab/wrappers/unl_wrapper -a fixpermissions

Cisco IOU Image Script#

#! /usr/bin/python3

print("*********************************************************************")

print("Cisco IOU License Generator - Kal 2011, python port of 2006 C version")

import os

import socket

import hashlib

import struct

# get the host id and host name to calculate the hostkey

hostid=os.popen("hostid").read().strip()

hostname = socket.gethostname()

ioukey=int(hostid,16)

for x in hostname:

 ioukey = ioukey + ord(x)

print("hostid=" + hostid +", hostname="+ hostname + ", ioukey=" + hex(ioukey)[2:])

# create the license using md5sum

iouPad1 = b'\x4B\x58\x21\x81\x56\x7B\x0D\xF3\x21\x43\x9B\x7E\xAC\x1D\xE6\x8A'

iouPad2 = b'\x80' + 39*b'\0'

md5input=iouPad1 + iouPad2 + struct.pack('!i', ioukey) + iouPad1

iouLicense=hashlib.md5(md5input).hexdigest()[:16]

print("\nAdd the following text to ~/.iourc:")

print("[license]\n" + hostname + " = " + iouLicense + ";\n")

with open("iourc.txt", "wt") as out_file:

   out_file.write("[license]\n" + hostname + " = " + iouLicense + ";\n")

print("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAlready copy to the file iourc.txt\n ")

print("You can disable the phone home feature with something like:")

print(" echo '127.0.0.127 xml.cisco.com' >> /etc/hosts\n")

# end of the script

Final output on eve-ng

Refer to the video with the steps