2001:db8::1 +----------+ | R1 | +----------+ | +----------+ | R2 | 2001:db8::2 +----------+ * | * * * | * * *link1| * * 2001:db8::4 * | *link2 * 2001:db8::5 +-----------+ | * +-----------+ | R4 | | * | R5 | +-----------+ | * +-----------+ * | * * + * | * * + * | * * + +-----------+ +-----------+ 2001:db8::3 | R3 | |R6 |2001:db8::6 +-----------+ +-----------+ | +-----------+ | R8 | 2001:db8::8 +-----------+