BGP (Border Gateway Protocol)
08.05.2020 23:11
#CISCO #PACKETTRACER #BGP #BORDERGATEWAYPROTOCOL #BILGISAYARAGLARI
BGP (Border Gateway Protocol)
What is BGP (Border Gateway Protocol)?
Border Gateway Protocol enables decisions to be directed to the core on the Internet. Although BGP is indeed a reliable and healthy routing protocol, it is a slow routing protocol. This protocol protects an IP network table or shows the network's availability between autonomous systems. It is described as the path vector protocol.
Working system
BGP neighbors are an opportunity for the configuration to be set up manually on the port 179 of TCP generation between routers. A BGP announcer periodically sends 19-byte live messages to the main link (every 60 seconds). Among these routing protocols, BGP is unique as the protocol for relaying TCP.
When BGP passes through the autonomous system (AS), it is called internal BGP (IBGP or Interior Border Gateway Protocol). When it passes through autonomous systems, it is called external BGP (EBGP or Exterior Border Gateway Protocol). Another AS is the border or end routers that are on the border of the AS that exchanges information. In the operating system, the IBGP directions are less than 200 administrative distances than the external BGP or any internal router protocol. Other router applications also prefer EBGP over IGP. In addition, BGP provides authorization of access with "MD5" to ensure connection security.
Tables
A router holds 3 tables to communicate with BGP.
- Neighbor Table: Neighbor routers are written manually in this table. Also, what information to send to which router can be kept in this table.
- BGP Table: Every minute, it keeps if it receives the information of standing-trying from neighboring routers.
- IP Routing Table: It keeps the best routes in BGP table.