3com S7906E 설치 설명서

 

1-7 

Figure 1-5 Network diagram for hub and spoke networking scheme 

 

 

In 

, the spoke sites communicate with each other through the hub site. The arrows in the 

figure indicate the advertising path of routes from Site 2 to Site 1: 

z 

The hub PE can receive all the VPN-IPv4 routes advertised by spoke PEs. 

z 

All spoke PEs can receive the VPN-IPv4 routes advertised by the hub PE. 

z 

The hub PE advertises the routes learnt from a spoke PE to the other spoke PEs. Thus, the spoke 

sites can communicate with each other through the hub site. 

z 

The import target attribute of any spoke PE is distinct from the export VPN targets of the other 

spoke PEs. Therefore, any two spoke PEs can neither directly advertise VPN-IPv4 routes to each 

other nor directly access each other. 

The extranet networking scheme can be used when some resources in a VPN are to be accessed by 

users that are not in the VPN.  

In this kind of networking scheme, if a VPN needs to access a shared site, the export target attribute 

and the import target attribute of the VPN must be contained respectively in the import target attribute 

and the export target attribute of the VPN instance of the shared site.