The development status and future directions of man routing in China

Man routing also plays a vital role in the development of routing. According to the current development of man routing in China, it is still very stable. There are three typical man routes in China, one is China Mobile's CMnet, the other is China Telecom's IP Man, and the other is China Netcom's IP Man. As the final position for access, the man routing service is the most complex. Includes IPTV, voice, Internet, leased line, VPN and other services.

However, China's man network is not only complicated in terms of business, but also extremely prosperous in terms of topology. For example, China Netcom is currently building a cube architecture in the metropolitan area network route for the Beijing Olympics, the four nodes in the upper layer are Huawei's NE5000E, and the four points in the lower layer are CISCO's 12816 CRS, which is not very stable, so we did not dare to use it). This gorgeous structure is called the "nest" in the network "! However, among the man networks in China, China Telecom's man routes are the most perfect, because China Telecom started from data and is the most powerful ISP in China, therefore, the construction of man routing is also a typical example in the world.

China Telecom's IP Man routing is an extension of the carrier's telecom-level IP bearer network backbone network (CN2) and its Internet backbone network (ChinaNet) within the region), directly accessing customers and providing services, is the carrier's full-service access network. IP Man provides integrated service access and bearer services, including Internet, IP leased line, VoIP, and video communication. It is responsible for transmitting services to two backbone networks. The following describes the routing policies for man networks of China Telecom:

After the CN2 construction is complete, the man routing becomes the topology connected to two different ISPs. In addition to the traffic destined for CN2, other traffic is routed to ChinaNet by default. therefore, the man must know the man route of CN2. The CN2 Access Router can use BGPv4 to inform the man router Of the man route of CN2, And the ChinaNet access router uses BGPv4 to generate a default route for the man. The AS numbers of man networks can be transferred to CN2 and ChinaNet, but CN2 and ChinaNet cannot be transferred to other ISPs because the AS numbers of man networks use private.

The man egress router participates in the IGP routing protocol in the man, generates a default route, and publishes it to the IGP so that the man devices can know that all traffic from the man egress router should be sent to the man egress router. Therefore, each man has two default routes pointing to the egress of the man respectively. Because OSPF delivers default routes only when it receives default routes from other protocols, the default routes in the man are actually obtained by ChinaNet! Types of man routes in man:

1. Internal Management and Internet man routing. To ensure the accessibility of man routers, We Need To summarize and spread these man routes to two backbone networks.

2. Internet service address space routing, that is, normal Internet address, but most of the addresses are routed through NAT at the egress, with only a few public addresses. These addresses need to be aggregated and spread to the Internet business backbone network.

3. IP Telecom Service address space routing, such as IPTV and VOIP services, is summarized and spread to two backbone networks.

4. the routing of the leased line customers who are switching from the Internet backbone network to the network but still using the original address space. These customers need to know the routing of the Internet man and the Business routing of CN2, therefore, these routes are not aggregated and directly spread to the IP Telecom Business backbone network.

5. The man route of the IP Telecom Business backbone network customers with global AS and independent address space-directly spread to the IP Telecom Business backbone network without summary.

6. Man VIP user man routing-Summary spread to the IP Telecom Business backbone network.

7. NGN/3G and other business private network routes-If mpls vpn is used, only PE and private network devices exist. Otherwise, the routes are summarized and then spread to the IP Telecom Business backbone network.

8. Two Backbone Network Man routes-internal spread to the core, the convergence layer deployment IBGP ).

9. Default man route pointing to the Internet backbone network-spread across the entire network using IGP.