In other words, RIP is a soft state protocol. Every route has a property called a metric, which indicates the distance to the route's destination. Every time a router receives a route advertisement, it increments the metric.
Venous reflux disease, also known as venous insufficiency, is a medical condition affecting the circulation of blood in the lower extremities. Normally, one-way valves in the veins keep blood flowing toward the heart against the force of gravity. When the valves become weak and do not close properly, they allow blood to flow backward and this is a condition called reflux.
Figure 4 Superficial and deep venous reflux. Notes: Reflux is measured while imaging the vein in the transverse orientation. The proximal end of the vein is on the left side of the image. In the examination of the great saphenous vein, the vein is imaged in the transverse section with color-Doppler ultrasound.