IP Overview Directory

 

IP

IP Routing Protocol

Choosing Routing Protocol

Interior Gateway Router Protocol

Exterior Gateway Routing Protocol

IP

Internet protocol (IP) is a kind of protocol exchanging data on computer network in the form of packet. It has the function of addressing, fragmentation, reassembly and protocol multiplexing. It is the basis of all the other IP Protocols (called IP protocol family). As network layer protocol, IP includes the addressing used for router and control information.

Transmission control protocol (TCP) is established on IP. TCP is connection-oriented protocol. So it defines the format of data and confirming information in data transmission. TCP also defines the method of confirming the right delivery of data. TCP allows the multiple application programs in a system to communicate each other simultaneously because it can transmit the received data to application programs respectively.

The function IP addressing, such as address resolution protocol (ARP) and network address translation, will be introduced in “IP Addressing”. IP services like ICMP, hot backup of router protocol, IP statistic and performance parameter, etc will be introduced in “Configuring IP Services”.

IP Routing Protocol

 The router of the Company implements multiple IP dynamic routing protocol. They will be introduced in the description of each potocol in this Chapter.

IP routing protocols are classified into two categories: interior gateway router protocol (IGP) and exterior gateway router protocol (EGP). The routers of our Company support RIP, OSPF, BGP and BEIGRP.  RIPOSPFBGP and BEIGRP can be configured separately on real needs. The router of our company supports simultaneous configuration of multiple routing protocol, including unlimited OSPF ( if memory is sufficient) processes, a BGP process, a RIP progress and unlimited BEIGRP processes. Command “redistribute” can be used to inject other router protocols into the database of current routing protocol so that the multiple routing protocols can be associated.

In order to configure IP dynamic routing protocol, the corresponding process shall be started and the corresponding network interfaces and the specific dynamic routing process should be associated, to indicate on which interfaces where the routing process run. To this end, the relevant steps for configuration shall be referred to in the corresponding document of configuration commands.

Choosing Routing Protocol

The choice of routing protocol is a complicated process. When choosing a routing protocol, the following factors shall be taken into account:

The size and complexity of the network

Whether the support for VLSM is needed

Network traffic

Security requirement 

Reliability requirement 

Policy

Others

The subject will not be detailed here. It is noted that the chosen routing protocol shall meet the real condition of network and comply with your requirements.

Interior Gateway Router Protocol

Interior Gateway Routing Protocol is used for the network in a single autonomous system. All the IP interior gateway routing protocol shall be associated with some specific networks (such as configuring: network) when it is launched. Each routing process listens to update messages from other routers on the network and broadcasts its own routing information on the network at the same time. The inside gateway router protocol supported by the router of the Company includes:

RIP

OSPF

BEIGRP

Exterior Gateway Routing Protocol

Exterior gateway routing protocol is used for exchange routing information between different autonomous systems. It is usually required to configure the corresponding neighbors for exchanging routes, the reachable networks and local autonomous system number. The exterior gateway routing protocol supported by the router of our company is BGP.