Route Exchange Test Technology Study Notes

With the rapid development of China's routing industry, the application of Routing Switching technology is also very extensive, so I have studied the practical application of Routing Switching testing technology, here to share with you, I hope it will be useful to you. The rapid development of Internet technology puts forward higher requirements for infrastructure.

IPTV services, network videos, IP phones, and other services require that network bandwidth and QoS be guaranteed; p2P services and spam are constantly consuming bandwidth and affecting the QoE metrics of normal services. To meet users' increasing bandwidth and business needs. Operators and equipment manufacturers must strictly test the growing IP bearer network and the increasingly sophisticated routing and exchange testing technology equipment, to ensure high capacity, high performance and high speed IP bearer network development requirements. The integration of multiple services also puts forward higher requirements on network devices. For QoE (Quality of Experience) testing that users are concerned about, application layer traffic must be used, that is, the stateful 4 ~ Layer-7 traffic.

Separate 4 ~ Layer-7 Traffic testing tools are available on the market, including IXIA IxLoad. One of these tools is to directly connect to the sending and receiving ports of the devices under test, there is no complex and real route table. In order to fully verify the performance of the routing device with the deep packet detection function, the route table and 4 ~ Layer-7 stateful traffic integration testing.
The latest development of Route exchange Testing Technology, the traditional test content such as route table capacity test, exchange and forwarding capability test, and even oscillation test cannot meet the test requirements of Routing Switching devices with large capacity, high performance, and rich functions. For example:

(1) The combination of OSPF and LDP promotes the development of VPLS technology;
(2) The integration of ISIS + RSVP + BGP and other protocols promotes the rapid application of L3VPN technology;
(3) The combination of OSPF + LDP + PIM + BGP promotes the development and wide application of Multicast VPN technology;
(4) Ethernet, FR, ATM, PPP, MPLS, and other access methods, edge Routers become "Service Router" by integrating different encryption or encapsulation forms, packet classification and filtering, and QoS re-marking technologies ".

Testing instruments can achieve multi-protocol integration and high scalability, which is the basic prerequisite for coping with these problems. The integration of technology requires the scalability of the Test Instrument in multiple aspects: the generation and analysis of traffic bandwidth, the speed and quantity of interfaces, and the ability to establish concurrent connections and connection rates, number of Route exchange test techniques, number of established neighbors, and so on. Based on this, IXIA shares with you the latest test techniques and methods of routing and switching equipment. The test examples are examples of the customer's actual use, including the device manufacturer, operators and large enterprise users.

Latest route exchange Testing Technology

The existing L3VPN can transmit Unicast (Unicast) traffic, or use the Point-to-Point GRE tunnel to transmit very small-scale Multicast (Multicast) traffic. The extensive application of IPTV, network video conferencing, and other Multicast services has greatly promoted the development of Multicast technology. Multicast VPN is a technology launched to solve the problem that mpls vpn is not suitable for transmitting Multicast services.

In terms of IP network design, faults cannot be restored within less than 1 s. However, applications such as VoIP and IPTV are increasingly demanding for rapid Fault Detection and recovery. As a draft IETF standard, Bidirectional Forwarding Detection (BFD) provides a method for detecting the forwarding capability of links or systems, improving Fault Detection and recovery speeds.

Technically, BFD establishes a session on two routers to monitor two-way forwarding routes between the two routers and serve the upper-layer protocol. BFD does not discover the mechanism, but is notified of WHO to establish a session with by the upper-layer protocol of the service, after a session is established, if the peer BFD control packet is not received within the detection time, it is deemed that a fault has occurred, and the upper-layer protocol of the service is notified, and the upper-layer protocol is processed accordingly.