-IPv4 and IPv6 routes must be whitelisted in separate routing policies. An InterLink must therefore have a **minimum of one** and a **maximum of two** attached routing policies, one for each IP traffic type to be routed (IPv4 and/or IPv6). When [route propagation](#route-propagation) is activated, the route ranges defined in the attached routing polic(ies) are whitelisted, and traffic can flow across the InterLink along these routes. [Learn more about routing across an InterLink](/interlink/reference-content/overview/#routing-across-an-interLink).
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