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Routing Protocols

  • Redistribution of IPv4 routes with IPv6 next hop into BGP (QFX Series)—Starting in Junos OS Evolved Release 21.2R1, devices running Junos OS can forward IPv4 traffic over an IPv6-only network, which generally cannot forward IPv4 traffic. As described in RFC 5549, IPv4 traffic is tunneled from CPE devices to IPv4-over-IPv6gateways. These gateways are announced to CPE devices through anycast addresses. The gateway devices then create dynamic IPv4-over-IPv6 tunnels to remote CPE devices and advertise IPv4 aggregate routes to steer traffic. Route reflectors with programmable interfaces inject the tunnel information into the network. The route reflectors are connected through IBGP to gateway routers, which advertise the IPv4 addresses of host routes with IPv6 addresses as the next hop.

    To configure a dynamic IPv4-over-IPv6 tunnel, include the dynamic-tunnels statement at the [edit

    routing-options] hierarchy level.

    [See Understanding Redistribution of IPv4 Routes with IPv6 Next Hop into BGP.]