I cut and pasted out of a Cisco doc and added it below. Maybe different VPNS was the wrong wording.
Actually, I'm trying to find out for a client connected via a VPN, which routers act as Hubs and Spokes. The doc actually says that the Hubs and Spokes have different VRFs (an upstream and a downstream), not VPNs.
I want to look at the MIBs for the VRfs to see
if I can figure out whether the path is actually going to be full-mesh or hub and spoke. I then want to be able to see for a given VPN, the Hub/Spoke relationships.
I.E. Find which are the hubs and which spokes go through which hubs. Thus if a Hub goes down, I'll know certain Spokes are now unreachable.
Here is output from the doc:
Table 1 Feature Information for Configuring Scalable Hub-and-Spoke MPLS VPNs
Feature Name Releases Feature Configuration Information
MPLS VPN: Half Duplex VRF Support 12.3(6)
12.3(11)T
This feature ensures that VPN clients that connect to the
same PE router at the edge of the MPLS VPN use the hub
site to communicate.
The following sections provide information about this
feature:
• Overview, page 2
• Upstream and Downstream VRFs, page 3
• Reverse Path Forwarding Check, page 3
• How to Ensure that MPLS VPN Clients Use the Hub PE
Router, page 4
CCSP,
