Conectivity question -End to End
In the lab, we are typcally asked to provide end to end connectivity between the remote vpn sites. Take this simple scenario as an example:
assume that you are running any IGP other then OSPF as the ce to pe protocol. On CE1 (or CE2), you advertise your loopback 0 and the interface connected to the PE. On the PE, you do mutual redistribution between bgp and igp to gain end to end connectivity.
Taking on board the above scenario, if we ping from CE1 to CE2, it will fail unless we source it from the loopback 0 interface on the CEs. Unless we do redistribute connected or use the network statments (on the PEs) to advertise links between the PEs and the CEs, CEs will only be able to ping each other via the loopback interfaces.
The question is this, pinging from loopback addresses only from the CEs, does it actually satisfy the question's requirement of end to end connectivity or should we also redistribute connected or use the network statments to advertise link info as well so when we ping from the CEs, we do not need to use loopback 0 as our source address?