bgp routing protocol pdf

routing is based on whether in an autonomous system and can be divided into internal Gateway Protocol (IGP) and External Gateway Protocol (BGP), the common internal Gateway Protocol has RIPOSPF and other external gateway protocol

database, and then produces a routing table based on the database. Moreover, the transmission of OSPF link state information is not based on UDP or TCP, but rather as a separate protocol that has a specific value in the Protocol field in the header of the IP data.In an OSPF-based routing table, there is only one optim

IP address of an external route must be continuous. Route reduction is completed through the sub-commands under "router ospf", and this command is only valid on the VBR of the autonomous domain:Summary-address ip-address mask For example, router B injects an external route into the OSPF domain, and the injected subnet range is 126.1.96-127. To perform route reduction, you must perform the following operations on vrob B:RouterB #Router ospf 102Summary-address 126.1.96.0 255.%224.0Redistribute

, such as BGP (Border Gateway Protocol) to exchange routing information. The second is that the summary route is good and is added to the static route of the new network in this router. Any data packet that uses this route to reach this router will be sent to the new network, but OSPF does not know its existence. To this end, although we "re-allocate" These

used to learn and maintain route tables. It obtains route update packets from other participants on the network. The dynamic routing protocol can be divided into the following two categories based on the operating region: 1. IGP (Internal Gateway Protocol): Used to exchange routing information within the autonomous sy

(config)# Exit Dynamic Routing can be divided into internal gateway protocol (IGP) and external Gateway Protocol (BGP) based on whether it is used in an autonomous system ), common internal gateway protocols include RIPOSPF and other external gateway protocols have BGPBGP-4 here mainly talk about the internal gateway

The common dynamic routing protocols are:1 . Rip:routing Information Protocol, routing Information Protocol. 2. Ospf:open Shortest Path First, open Shortest path preferred. 3. Isis:intermediate system to intermediate system, intermediate systems to intermediate systems. 4. Bgp:border Gateway

DCN's hello Route 90 Berkeley's RIP Route 100 Route 110 for point-to-point interface Aggregation Down interface route 120 Clustering default route priority 130 OSPF extended Route 140 BGP Route 170 EGP route 200 The concept of the routing priority is that a new route with a higher priority can replace a route with a lower priority for the same-sink routing. Othe

redirection packets (corresponding to the above d, m mark) For example, if an IP data packet is sent to the default route option B in host a, and then B checks the route table to know that the correct route is C, B forwards it to C. At the same time, also, send an ICMP redirection packet to a, indicating that the correct part is C. (Note: These are only the route tables of hosts on the LAN) 5. Dynamic Routing Pro