PLANET XGS3-24042 - Manual (Page 678)

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Figure 81-5 Hub&Spoke Networking Resolution
In the above figure, Spoke sites communicate with each other via Hub sites (the arrow in the figure is the
route advertisement process from site2 to site1):
 Hub-PE can receive VPN-IPv4 routes advertised by all Spoke-PE
 The VPN-IPv4 routes advertised by Hub-PE can be received by all Spoke-PE;
 Since Hub-PE can advertise routes it learns from Spoke-PE to other Spoke-PE, the spoke sites can
intercommunicate with each other via the Hub site.
 The Import Target attribute of any Spoke-PE is different from the Export Target attribute of other
Spoke-PE. So, any pair of Spoke-PE cannot advertise VPN-IPv4 routes to each other or
intercommunicate directly.
Extranet VPN
Figure 81-6 Extranet Networking Resolution
site2
VPN1
site3
CE-Spoke
CE-Hub
Hub-PE
VPN1
CE
VPN1
site1
CE
Spoke-PE
VPN1:
Import: Hub
Export: Spoke
Spoke-PE
VPN1:
Import: Hub
Export: Spoke
VPN1-Spoke:
Import: Spoke
VPN1-Hub:
Export: Hub
site2
VPN1
PE3
VPN2
CE
site1
CE
PE1
VPN1:
Import: 1:1
Export: 1:1
PE2
VPN2:
Import: 2:1
Export: 2:1
VPN1:
Import: 1:1, 2:1
Export: 1:1, 2;1
VPN1
site3
CE