IP Overview Directory
Interior
Gateway Router Protocol
Exterior
Gateway Routing Protocol
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”.
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. RIP、OSPF、BGP
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.
The
choice of routing protocol is a complicated process. When choosing a routing
protocol, the following factors shall be taken into account:
⒈
The size and complexity of the network
⒉
Whether the support for VLSM is needed
⒊
Network traffic
⒋
Security requirement
⒌
Reliability requirement
⒍
Policy
⒎
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.