For each VRF table, have a goal of routing and routing the two distinguishing character attributes. VPN in the IP address of the plan is developed by the customer, so there may be customer choice in the private addresses defined in RFC1918 as their VPN site address or a different domain using the same address, the address is the so-called overlap. One consequence of overlapping address BGP VPN can not be distinguished from the overlapping of different routes, leading to a site unreachable. To solve this problem, BGP / MPLS VPN PE router, in addition to using the VRF table on the use of multiple methods, but also introduces the concept of RD. RD has a globally unique, by 8 bytes of the RD as the extension of IPv4 address prefix, so that not only IPv4 addresses into unique VPN-IPv4 addresses. VPN-IPv4 address of the client device is not visible from the road only for the backbone network of information distribution.
style = "COLOR: blue; FONT-FAMILY: Verdana; mso-ascii-font-family: Times islunardate =" False "isrocdate =" False "w: st =" on "month =" 6 "year =" 2009 "> June 29 Although Microsoft will be on time in the holiday shopping season, this years launch of Windows 7, in September of this years school shopping season, consumers probably still have to give way to Vista. Therefore, Microsoft has been studying in recent months, announced last week a free upgrade program. Under this program, buy a new PC with Windows Vista Home Premium, Business or Ultimate users, can in Windows 7 in October after the listing, get a free upgrade. Microsoft hopes this will boost PC sales.