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_ip1Ipv4RouteCount = 0for y in range(BgpRouteBlock):mask = random.randint(MaskMin, MaskMax)if y == BgpRouteBlock-1:RouteCount = Ipv4RoutePerSession - Ipv4RouteCountelse:RouteCount = random.randint(Ipv4CountRandonMin, Ipv4CountRandonMax)Ipv4RouteCount = Ipv4RouteCount+RouteCountoffset = 32 - maskif 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 - Ipv6PrefixCountelse:RouteCount = random.randint(Ipv6CountRandonMin, Ipv6CountRandonMax)Ipv6PrefixCount = Ipv6PrefixCount + RouteCountoffset = 128 - maskif 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 = IPv6PrefixGeneratorIPv6Route = 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 += communitycommunity_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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