如何使用自动化构造随机路由模型

为什么要仿真随机路由？

路由器测试中，为了最大程度还原现网路由情况，评估路由器在现网环境下稳定工作各项指标，需要对导入路由进行离散仿真，目前路由仿真可分为导入路由与生成路由两种方式，导入路由需要现网路由表导入，本文讨论重点为生成路由方式。

自动化生成路由能解决什么问题？

使用用户界面生成路由时，可根据离散模型生成路由，但生成路由与现网路由相比，只注重路由段离散，未体现AsPath、Community等BGP路由参数离散，使用自动化生成路由可根据定义规则进行生成。

如何使用自动化生成随机路由

信而泰Renix平台提供了python API接口,可使用python API进行路由灵活定义。假设路由需求如下：配置Port口1个，包含20个IBGP，个IBGP通告10个路由段、共10wIPv4+10wIPv6路由，要求路由掩码随机选择，AsPath随机选择、Connmity随机选择。

本文选择基础API使用信而泰API（renix_py_api、MiscLibrary），不另做定义，使用时需安装相关环境。代码解析如下：

导入相关库

#!/usr/bin/python

-- coding: UTF-8 -

import time

from renix_py_api.renix import *

from MiscLibrary.base import *

import logging

import random

import re

初始化Python环境及定义参数

if name == 'main ':

初始化环境

print('######################初始化环境######################')

print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

###############################################################

api = MiscAPI()

initialize(log=True, log_level=logging.INFO, log_handle=LogHandle.LOG_FILE)

###############################################################

占用测试仪端口

chassis_DY = "10.1.1.7"

port_DY_1 = "//10.1.1.7/3/1"

路由起始地址

start_ip1 = "20.0.0.0"

start_ipv61 = "2023::"

#bgp路由参数

RgpSessionCount = 20

BgpRouteBlock = 10

BgpRouteBlockv6 = 10

ipv4routecount = 100000

ipv6routecount = 100000

#ipv4路由掩码

MaskMin = 20

MaskMax = 30

ipv6路由掩码

PrefixMin = 80

PrefixMax = 120

bgp as_path&community限制

AsPathMaxLength = 8

CommunityMaxLength = 8

###############################################################

#其它参数

Ipv4RoutePerSession = int(ipv4routecount / RgpSessionCount)

ipv6PrefixPerSession = int(ipv6routecount / RgpSessionCount)

Ipv4CountRandonMax = int(Ipv4RoutePerSession / BgpRouteBlock)

Ipv4CountRandonMin = int(Ipv4CountRandonMax * 0.5)

Ipv6CountRandonMax = int(ipv6PrefixPerSession / BgpRouteBlockv6)

Ipv6CountRandonMin = int(Ipv6CountRandonMax * 0.5)

print('######################初始化完成######################')

print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

创建端口及映射机箱

print('#######################连接机箱#######################')

print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

sys_entry = get_sys_entry()

sys_entry.edit(ProductType=1)

chassis = ConnectChassisCommand(chassis_DY)

chassis.execute()

占用端口、端口上线

port_1 = Port(upper=sys_entry, Location=port_DY_1, name='port_1')

BringPortsOnlineCommand(PortList=[port_1.handle,port_2.handle]).execute()

print('######################连接成功！######################')

print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

print('#######################创建IBGP#######################')

print(time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(time.time())))

参数生成器定义

GeneratorRouteridv4 = api.address_modifier(Start=r'192.168.0.1', Step=1, Count=1000, Offset=0)

GeneratorRouteridv6 = api.address_modifier(Start=r'192:168::1', Step=1, Count=1000, Offset=0)

GeneratorMacAddress = api.address_modifier(Start=r'00:10:94:00:00:01', Step=1, Count=1000, Offset=0)

GeneratorIPv4Address = api.address_modifier(Start=r'10.0.0.2', Step=1, Count=1000, Offset=8)

GeneratorIPv6Address = api.address_modifier(Start=r'2000::2', Step=1, Count=1000, Offset=80)

#接口生成interface

for x in range(RgpSessionCount):

#接口参数定义

Routeridv4 = api.generator_next(GeneratorRouteridv4)

Routeridv6 = api.generator_next(GeneratorRouteridv6)

MacAddr = api.generator_next(GeneratorMacAddress)

IPv4Addr = api.generator_next(GeneratorIPv4Address)

IPv6Addr = api.generator_next(GeneratorIPv6Address)

IPv4GWAddr = api.ipv4_address_hopping(IPv4Addr, Mask=32, Type='decrement', Step=1)

IPv6GWAddr = api.ipv6_address_hopping(IPv6Addr, Mask=128, Type='decrement', Step=1)

创建IPv4接口

interface = Interface(upper=port_1, RouterId = Routeridv4, Ipv6RouterId = Routeridv6)

Interface_temp = "Interface_" + str(x+1)

build_Dual = BuildInterfaceCommand(InterfaceList=Interface_temp, NetworkLayers=['eth', 'vlan'], TopLayers=['ipv4', 'ipv6'])

build_Dual.execute()

eth_layer = interface.get_children('EthIILayer')[0]

eth_layer.edit(Address = MacAddr)

vlan_layer = interface.get_children('VlanLayer')[0]

vlan_layer.edit(VlanId = x+1 )

ipv4_layer = interface.get_children('Ipv4Layer')[0]

ipv4_layer.edit(Address = IPv4Addr , Gateway=IPv4GWAddr)

ipv6_layer = interface.get_children('Ipv6Layer')[0]

ipv6_layer.edit(Address = IPv6Addr , Gateway=IPv6GWAddr)

创建BGP协议及路由

创建BGP协议

    BgpSession = BgpProtocolConfig(upper=port_1)
    BgpSession.edit(AsNumber=65000)
    BgpSession.edit(DutAsNumber=65000)
    BgpSession.edit(UseGatewayAsDutIp=False)
    BgpSession.edit(DutIpv4Address=IPv4GWAddr)
    BgpSession.edit(DutIpv6Address=IPv6GWAddr)
    # 绑定Dual接口和协议
    select_interface = SelectInterfaceCommand(ProtocolList=[BgpSession.handle], InterfaceList=[interface.handle])
    select_interface.execute()
    # IPv4路由block创建
    FirstRoute = start_ip1
    Ipv4RouteCount = 0
    for y in range(BgpRouteBlock):
        mask = random.randint(MaskMin, MaskMax)
        if y == BgpRouteBlock-1:
            RouteCount = Ipv4RoutePerSession - Ipv4RouteCount
        else:
            RouteCount = random.randint(Ipv4CountRandonMin, Ipv4CountRandonMax)
        Ipv4RouteCount = Ipv4RouteCount+RouteCount
        offset = 32 - mask
        if x == 0 and y == 0:
            # bgp参数修改
            BgpRoute = BgpIpv4RoutepoolConfig(upper=BgpSession)
            BgpRoute.get()
            BgpRoute.edit(FirstRoute=FirstRoute)
            BgpRoute.edit(PrefixLength=mask)
            BgpRoute.edit(RouteCount=RouteCount)
            GeneratorIPv4Route = api.address_modifier(Start=FirstRoute, Step=RouteCount, Offset=offset, Count=1000)
            IPv4Route = api.generator_next(GeneratorIPv4Route)
            IPv4Route = api.generator_next(GeneratorIPv4Route)
        else:
            BgpRoute = BgpIpv4RoutepoolConfig(upper=BgpSession)

BgpRoute.get()

BgpRoute.edit(FirstRoute=IPv4Route)

BgpRoute.edit(PrefixLength=mask)

BgpRoute.edit(RouteCount=RouteCount)

Start = IPv4Route

GeneratorIPv4Route = api.address_modifier(Start=Start, Step=RouteCount, Offset=offset, Count=1000)

IPv4Route = api.generator_next(GeneratorIPv4Route)

IPv4Route = api.generator_next(GeneratorIPv4Route)

bgp参数修改

as_path_length = random.randint(2, AsPathMaxLength)

community_length = random.randint(2, CommunityMaxLength)

as_path_list = list()

community_list = list()

AsPathIncrement_list = list()

as_path_tem = str()

community_tem = str()

communityIncrement_list = list()

for z in range(as_path_length):

as_path = random.randint(300, 64000)

as_path_list.append(as_path)

for z in range(community_length):

community1 = random.randint(1, 65535)

community2 = random.randint(1, 65535)

community = str(community1) + ':' + str(community2)

community_list.append(community)

for i in range(len(community_list) - 1):

community = community_list[i]

community_tem += community

community_tem += ','

community_tem += str(community_list[-1])

AsPathPerBlockCount = int(RouteCount / 6.5)

for z in range(len(as_path_list)):

AsPathIncrement_list.append(1)

for z in range(len(community_list)):

Temp = str(1) + ':' + str(1)

communityIncrement_list.append(Temp)

BgpRoute.edit(AsPath=as_path_list)

BgpRoute.edit(AsPathIncrement=AsPathIncrement_list)

BgpRoute.edit(AsPathPerBlockCount=AsPathPerBlockCount)

BgpRoute.edit(Community=community_tem)

BgpRoute.edit(CommunityIncrement=communityIncrement_list)

BgpRoute.edit(CommunityPerBlockCount=AsPathPerBlockCount)

IPv6路由block创建

FirstPrefix = start_ipv61

Ipv6PrefixCount = 0

for y in range(BgpRouteBlockv6):

mask = random.randint(PrefixMin, PrefixMax)

        if y == BgpRouteBlockv6 - 1:
            RouteCount = ipv6PrefixPerSession - Ipv6PrefixCount
        else:
            RouteCount = random.randint(Ipv6CountRandonMin, Ipv6CountRandonMax)
        Ipv6PrefixCount = Ipv6PrefixCount + RouteCount
        offset = 128 - mask
        if x == 0 and y == 0:
            # bgp参数修改
            BgpRoute = BgpIpv6RoutepoolConfig(upper=BgpSession)
            BgpRoute.get()
            BgpRoute.edit(FirstIpv6Route=FirstPrefix)
            BgpRoute.edit(PrefixLength=mask)
            BgpRoute.edit(RouteCount=RouteCount)
            GeneratorIPv6Route = api.address_modifier(Start=FirstPrefix, Step=RouteCount, Offset=offset, Count=1000)
            IPv6Prefix = api.generator_next(GeneratorIPv6Route)
            IPv6Prefix = api.generator_next(GeneratorIPv6Route)
              else:
            BgpRoute = BgpIpv6RoutepoolConfig(upper=BgpSession)
            BgpRoute.get()
            BgpRoute.edit(FirstIpv6Route=IPv6Prefix)
            BgpRoute.edit(PrefixLength=mask)
            BgpRoute.edit(RouteCount=RouteCount)
            Start = IPv6Prefix
            GeneratorIPv6Route = api.address_modifier(Start=Start, Step=RouteCount, Offset=offset, Count=1000)
            IPv6Prefix = api.generator_next(GeneratorIPv6Route)
            IPv6Prefix = api.generator_next(GeneratorIPv6Route)
            # bgp参数修改
        as_path_length = random.randint(2, AsPathMaxLength)
        community_length = random.randint(2, CommunityMaxLength)
        as_path_list = list()
        community_list = list()
        AsPathIncrement_list = list()
        as_path_tem = str()
        community_tem = str()
        communityIncrement_list = list()
        for z in range(as_path_length):
            as_path = random.randint(300, 64000)
            as_path_list.append(as_path)
        for z in range(community_length):
            community1 = random.randint(1, 65535)
            community2 = random.randint(1, 65535)
            community = str(community1) + ':' + str(community2)
            community_list.append(community)
        for i in range(len(community_list) - 1):
            community = community_list[i]
            community_tem += community
            community_tem += ','
        community_tem += str(community_list[-1])
        AsPathPerBlockCount = int(RouteCount / 6.5)
         for z in range(len(as_path_list)):
            AsPathIncrement_list.append(1)
        for z in range(len(community_list)):
            Temp = str(1) + ':' + str(1)
            communityIncrement_list.append(Temp)
        BgpRoute.edit(AsPath=as_path_list)
        BgpRoute.edit(AsPathIncrement=AsPathIncrement_list)
        BgpRoute.edit(AsPathPerBlockCount=AsPathPerBlockCount)
        BgpRoute.edit(Community=community_tem)
        BgpRoute.edit(CommunityIncrement=communityIncrement_list)
        BgpRoute.edit(CommunityPerBlockCount=AsPathPerBlockCount)
# Save the test case to D:\ as the name of bgp_random.xcfg
save_case = SaveTestCaseCommand(TestCase='D/：bgp_random.xcfg', ProductType=1)

随机路由生成测试

执行代码后，生成配置如下：

• 接口参数：
  
  
• BGP Session
  
• IPv4路由
  随机变化点：路由数量、路由前缀长度、AsPath、AsPath跳变步长、AsPath数量、Community、Community跳变步长、Community数量
  
  
• IPv6路由
  随机变化点：路由数量、路由前缀长度、AsPath、AsPath跳变步长、AsPath数量、Community、Community跳变步长、Community数量
  
  

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