HP FlexNetwork MSR2003 Configuration Manual page 347

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Hub-spoke—In a hub-spoke ADVPN, spokes communicate with each other through the hub.
The hub acts as both the route exchange center and data forwarding center.
As shown in Figure
communicate with each other through the hub.
Figure 141 Hub-spoke ADVPN
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Hub-group—A hub-group ADVPN can accommodate more ADVPN clients. This allows one
hub to manage all clients. As shown in
groups. Each hub group has one or multiple hubs and spokes.
Follow these guidelines to classify hub groups:
All hubs must belong to the backbone hub group. This hub group forms the full-mesh
backbone area. All hubs obtain information about other hubs from the VAM server and
establish permanent ADVPN tunnels to each other.
Spokes must belong to non-backbone hub groups. Each non-backbone hub group includes
at least one hub and uses either the full-mesh or hub-spoke structure. Spokes obtain hub
information in the ADVPN domain from the VAM server, and establish permanent tunnels to
the hub. Spokes can establish tunnels only to the hubs in the hub group.
Tunnel establishment and data forwarding in a hub group depend on the network structure.
Inter-group communications between spokes need to pass the hubs of the groups. To reduce
the pressure on hubs during inter-group communications, you can allow spokes in different hub
groups to establish a dynamic tunnel. The dynamic tunnel is deleted if no data exists during the
idle timeout time.
141, each spoke establishes a permanent tunnel to the hub. Spokes
Figure
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142, a hub-group ADVPN contains multiple hub