Routing Concepts

Routing Concepts

What’s Border Gateway Protocol (BGP)
What’s Classless Interdomain Routing (CIDR)
What’s Enhanced Interior Gateway Routing Protocol (EIGRP)
What's Interior Gateway Routing Protocol (IGRP)
What's Routing Information Protocol (RIP)

What’s Border Gateway Protocol (BGP)

The Border Gateway Protocol (BGP) is the core routing protocol of the Internet. BGP is an exterior gateway protocol (EGP) and performs interdomain routing in TCP/IP networks. BGP. BGP does not use traditional IGP metrics. It makes routing decisions based on path, network policies and/or rulesets.

What’s Classless Interdomain Routing (CIDR)

CIDR is a new addressing scheme for the Internet which allows for more efficient allocation of IP addresses than the old Class A, B, and C address scheme. It allowed increased flexibility when dividing ranges of IP addresses into separate networks.

What’s Enhanced Interior Gateway Routing Protocol (EIGRP)

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary routing protocol based on their original IGRP. EIGRP minimize both the routing instability incurred after topology changes, as well as the use of bandwidth and processing power in the router.

What's Interior Gateway Routing Protocol (IGRP)
IGRP is a distance-vector interior gateway protocol (IGP). Distance-vector routing protocols call for each router to send all or a portion of its routing table in a routing-update message at regular intervals to each of its neighboring routers.

What's Routing Information Protocol (RIP)
The Routing Information Protocol (RIP) is a distance-vector protocol that uses hop count as its metric. RIP is widely used for routing traffic in the global Internet and is an interior gateway protocol (IGP), which means that it performs routing within a single autonomous system.