IBGP is Preferred for ADVPN
✅ Single AS Environment – ADVPN deployments typically involve spokes and hubs within a single organization, meaning they usually belong to the same Autonomous System (AS).
✅ Route Reflectors (RR) Support – IBGP allows the hub to act as a route reflector, reducing the need for full mesh IBGP sessions among spokes.
✅ Consistent Policies – Easier to manage and apply consistent routing policies across all spokes.
✅ Better Control Over Path Selection – IBGP allows finer control of routes via local preference, which is useful for SD-WAN path selection.
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