What are the BGP types in the vrobgp?

What are the BGP types in the vrobgp, the BGP types are common problems, how to understand the BGP types, and what related passwords are there, all of them will be fully resolved in this article.

What is an autonomous system?

An autonomous system is a vro and network group under the control of a management organization. It can be a vro that is directly connected to a LAN and connected to the Internet. It can be a LAN that is interconnected by an enterprise backbone network. All routers in an autonomous system must connect to each other, run the same routing protocol, and assign the same autonomous system number. Links between autonomous systems use external routing protocols, such as B G P.

What is a BGP type?

Border Protocol (BGP) is a routing protocol that dynamically exchanges route information between autonomous systems. A classic definition of an autonomous system is a group of routers under the control of a management organization. It uses IGP and common measurement values to forward packets to other autonomous systems.

The term autonomous systems are used in BGP to emphasize the fact that the management of an autonomous system provides a unified internal routing plan for other autonomous systems, it provides a consistent description for networks that can be reached through it.

What session types does BGP support?

The session between neighboring vrouters of the BGP type is based on the TCP protocol. TCP provides a reliable transmission mechanism that supports two types of sessions: External BGP type EBGP): A session between two vrouters belonging to two different Autonomous Systems. These routers are adjacent and share the same media and subnet.

Internal BGP type IBGP): refers to the session between routers in an autonomous system. It is used to coordinate and synchronize routing processes in autonomous systems. BGP routers can be separated by several routers at any location in the autonomous system.

Note: "The content of the initial data stream is the entire BGP Route table. However, when the route table changes later, the router only transmits the changed part. The BGP type does not need to update the entire route table periodically. Therefore, when a connection has been established, a BGP sender must save the entire BGP Route table that is currently common to all vrouters at the same level.

The BGP router periodically sends the Keep Alive message to confirm that the connection is activated. When an error or special situation occurs, the router sends a Notification message. When a connection error occurs, a notification message is generated and the connection is disconnected. "-From rfc000054 and BGP type.

Does BGP allow route redistribution?

Yes. Because BGP is mainly used to select routes between autonomous systems, it must support the synthesis of routes selection tables for RIP, OSPF, and IGRP, so that their route tables can be transferred to an autonomous system. BGP is an external routing protocol, so its * operation is different from an internal routing protocol. In BGP, only when a route already exists in the IP route table can you use the NETWORK command to create a route in the BGP Route table.