VPN is huge and many of the original VPN users do not want to change their IPv4 addresses, it is necessary to allow different VPN clients use the same IPv4 address, the same for different VPN address, IPv4 addresses can be achieved by RD reuse. PE router protocol through MP-iBGP routes site notice will also carry the routing of the RD, will IPv4 addresses into VPN-IPv4 addresses, PE router receives the notice of MP-iBGP route, will see the route RD , then the VPN-IPv4 addresses into IPv4 addresses, the address of the RD be removed, import it into the appropriate VRF. VRF VPN is isolated due to the different, so different from the same VPN IPv4 addresses will be imported in to a different VRF. In the same VPN, the address must be unique; when the need for mutual communication between multiple VPN, then the required address must be unique in a number of VPN, and then only use the same number of VPN RD. RT to control the VRF import and export strategies in order to form complex VPN topologies. There may be more than a VPN using a RT, RT VPN specific use is closely related to the topology, for the full-mesh VPN can use a phase of the RT, for non-connected full-mesh VPN, a VPN often requires multiple RT . When exported from the PE VPN routing, the use of VPN routing tag RT, in the import route to the VRF, you can use multiple RT, as long as a VPN routes into the routing with the RT and RT in any of the same, are will be imported into the VRF in the.
In the industry view, not so much Netease Annaibuzhu, as it is a must. Sina has released a high-profile Olympic strategy, public disclosure of the Sina Sina Olympic Games coverage plans and marketing strategies. So the industry believes that the major sites of their advertisers have a perfect time to sell rhetoric, NetEase launched the Olympic Games has become a strategic necessity. Olympic news channel in the NetEase manufacturers have not seen ads. In fact, compared with Sina and Sohu, Netease online advertising business in the flat. Close to the Olympic Games, Sohu and Sina in the latest earnings report, the performance of a good advertising growth, and Netease reported a second quarter of this year, advertising service revenue was $ 8,600,000, compared with $ 9,000,000 last year.