Network Protocol basics: Resource Reservation Protocol

The RSVP Resource Reservation Protocol may seem vague to many people. Therefore, this is a type of communication rule on the Internet. Its working mode mainly protects link sharing. Now let's take a detailed look at its basic situation.

Resource Reservation Protocol, RSVP) is a set of communication rules that allow one source to play multiple receivers for videos and other high-bandwidth information) the channel or path that is transmitted on the Internet. Resource Reservation Protocol is part of the Internet Integrated Service (IIS) model, which ensures the best effort of services, real-time services, and controlled link sharing.

The basic philosophy of choice on the Internet is "Do your best". This philosophy is enough to serve most users, but still cannot meet the continuous stream transmission required for transmitting audio and video programs over the Internet. Users who want to receive a network program, such as a TV program played over the network, can retain the Internet bandwidth before the program is played, it can receive programs with a higher data transmission rate and a more reliable data stream than before. From the very beginning, the program will broadcast to the specified users with a pre-set priority. Resource Reservation Protocol (RSVP) also supports single-source and multi-source transmission.

Resource Reservation Protocol (RSVP) How does it work?

Assume that a video program is to be broadcast in a group at a time on Monday night. To receive the program, you will need a dedicated client program or your browser may contain this program) to assign sufficient bandwidth and package scheduling priority to the program, you need to send an RSVP request.

This request will be sent to the Internet gateway with the Resource Reservation Protocol Service closest to you. It will determine whether you are eligible to establish this reservation. If you are eligible, whether there is sufficient bandwidth reserved for you without affecting the reservation you have made. If you can make this reservation, the gateway will forward your reservation to the next gateway or Multicast Source in the direction of the destination ). In this way, your reservation will be guaranteed throughout the entire journey to the destination. If not all the reservations can be implemented, all the reservations will be canceled .)

At the beginning of multicast, with a high priority, the information package of the source point will be quickly transmitted over the Internet. When a package arrives at a gateway host, the host uses a group of queues. In some cases, there are also timers to classify and schedule them. A Resource Reservation Protocol package is flexible. It can change the size, data type, and number of objects. When a package needs to pass through a gateway that does not support resource reservation protocols, it can also "dig a tunnel" like a normal package. Both IPv4 and IPv6 include Resource Reservation Protocol (RSVP ).

The RSVP Resource Reservation Protocol provides two types of reservation

◆ Dedicated reservation (distinct reservation): the required reserved resources are only used by one sender. That is, different senders in the same session occupy different reserved resources.

◆ Shared reservation: the required reserved resources are used by one or more senders. That is, multiple senders in the same session share the reserved resources.

The RSVP Resource Reservation Protocol provides two sender selection methods.

◆ Wildcard method (wildcard): By default, all senders are allowed, and the wildcard filter is restricted by the source address list carried in the reserved message.

◆ Explicit mode (explicit): the filter explicitly specifies one or more senders for reservation.