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Topology
Summary:
To implement Flex VPN or IPSEC VPN the topology shown above. The motive is to make the reachability between LAN to LAN network i.e from 20.20.20.0 to 30.30.30.0 & vice versa.
Currently we have configure simple connectivity in which R1 and R2 is reachable to each other via internet cloud.
The basic requirement of any VPN is the rechability between source and destination end point of tunnel.
Topology
Objective:
To implement BGP over GRE , the topology shown above. In topology R1 & R3 running BGP 100 whereas R2 running only IGP.R1-R4 & R3-R5 running ebgp and advertising prefix 4.4.4.4 and 5.5.5.5 respectively.
R1-R2-R3 running ospf under area 0.
Bgp over GRE can be configured in scenario where end to end BGP is not running or where we want to bypass non bgp peer to peering with BGP peer.