Dry goods!How to Construct SRv6-TE Performance Test Environment Using Instrumentation

 一、什么是SRv6？

SRv6（Segment Routing IPv6,基于IPv6转发平面的段路由）是基于源路由理念而设计的在网络上转发IPv6数据包的一种协议.SRv6通过在IPv6报文中插入一个路由扩展头SRH（Segment Routing Header）,在SRH中压入一个显式的IPv6地址栈,The intermediate node continuously updates the destination address and offset address stack to complete the hop-by-hop forwarding.

二、SRv6产生的原因

SRv6的发展,主要有如下原因：

●未来的网络是面向5G时代的网络.面对5G,承载网也需要做出相应的调整.化繁为简,低时延,SDN/NFV化是后续的主要发展方向.

●为了5G网络的进一步发展,用户希望能够借用IPv6The address is simpler to implementVPN.SRv6技术就是采用现有的IPv6转发技术,通过扩展IPv6报文的头域,实现类似标签转发的处理.SRv6将一些IPv6地址定义成实例化的SID（Segment ID）,每个SID有着自己显式的作用和功能,通过不同的SID操作,实现简化的VPN,以及灵活的路径规划.

三、SRv6的意义

简化: 基于IPv6Reachability works,无需MPLSextra signaling .

◆行业接受度: MPLS无法进DC,基于IPv6可达的SRv6称为SRoption to enter the data center.

◆End-to-end unification: End-to-end unified routing/转发技术;E2E业务和SFCIncremental deployment is easy.

◆可延伸性: 按需PNF & VNF连接, Seamlessly realize cloud-network integration and linkage,Expand from the web to the business/APP.

四、SRv6-TESignificance of testing for device performance evaluation

Under the big wave of new metropolitan area network construction,SRv6The technology has achieved breakthrough large-scale applications.在实现E2E业务和SFC部署时,SRv6-TEas the main application model,Higher requirements are placed on the selection of network equipment,How to choose a more reliable one、More stable business router,SRv6-TEPerformance becomes one of the main evaluation performances.

五、How to use the tester definitionSRv6-TE测试模型

信而泰Daryu系列L2~3Layer high-end meter definitionSRv6-TE的构建,按SRv6-TEFrom the point of view of the drainage location,主要有两种方式：

1 .  仪表模拟PE+P,Use when streamingraw流模拟SRv6-TE流量,设备作为PThe device forwards traffic,从效果上看,This method cannot verify the authenticity of the deviceSRv6性能,This article does not introduce.

应用场景：SRv6测试场景

2 .  仪表模拟PE,The device performs a drain on the meter flow,In this way, the device can be simulated realisticallySRv6-TE模型的测试,You can refer to the following methods when building：

目标：构造L3VPN over SRv6-TE模型,Adapt to the device under testSRv6-Policy color引流模型

应用场景：SRv6-TE 性能测试场景

Construct the model step：The following describes how to create a single port,Modify as needed when creating multiple portsBGP下一跳地址、END.DT4、color,Automatic modification or generation can be used when modifying,本文不展开介绍.

1）仪表模拟PE时,It needs to be established with the device under testVPNv4与VPNv6邻居,Neighborhood needs to be usedIGPIntra-domain routing is established,Under normal circumstances, the first route is reachableloopback接口地址建立.isis通告loopback地址与srv6 locatorreachable route（用于bgp custom attribute中构建END.DT4）,如下所示：

192:2:50::1为BGP下一跳地址,用于通告BGP Updata报文

aaaa:1:1:1::1为END.DT4地址,bgp custom attribute中构建的bgp ipv6 prefixThis prefix is ​​required

2）Create a single stackIPv6的interface,bgp使用ipv6address to create a public network dual-stack neighbor,and check EnableSR

3）Bgp IPv4/IPv6Route next hop address type selectionIPv6,并填写ipv6地址

IPv4Route next-hop address type：选择IPv6Can be filled laterIPv6Next hop option,Fill in the meter analogloopback地址192:2:50::1

IPv6The route fills in the next hop,Fill in the meter analogloopback地址192:2:50::1

4）IPv4与IPv6构建colorDrain messages,如下所示：

Color值为3001

 5）IPv4与IPv6路由构建bgp custom attribute：

其中:

Route attribute type：40

Optional位：optional

Transitive位：transitive

Partial位：complete

The value of the route attribute：0500220001001E00AAAA000100010001000000000000000100001300010006301014000000

Analysis of each value：

路由属性类型：40代表BGP Prefix-SID

Flags位：分别配置optional、transitive、complete

The value of the route attribute：

05002200代表SRv6 L3 Service,长度为34

01001E00AAAA000100010001000000000000000100001300代表如下所示：

其中需要注意的是AAAA000100010001代表SRv6 SID Value,Each instrument is simulatedPE对应不同的值

  010006301014000000代表如下所示：