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Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 1 Overview
Summary of Layer 3 Unicast Routing Features
EIGRP
The EIGRP protocol is a unicast routing protocol that has the characteristics of both distance vector and
link-state routing protocols. It is an improved version of IGRP, which is a Cisco proprietary routing
protocol. EIGRP relies on its neighbors to provide the routes, typical to a distance vector routing
protocol. It constructs the network topology from the routes advertised by its neighbors, similar to a
link-state protocol, and uses this information to select loop-free paths to destinations. For more
information, see Chapter 8, “Configuring EIGRP.”
IS-IS
The Intermediate System-to-Intermediate System (IS-IS) protocol is an intradomain Open System
Interconnection (OSI) dynamic routing protocol specified in International Organization for
Standardization (ISO) 10589. The IS-IS routing protocol is a link-state protocol. Features of IS-IS are
as follows:
• Hierarchical routing
• Classless behavior
• Rapid flooding of new information
• Fast Convergence
• Very scalable
For more information, see the Chapter 9, “Configuring IS-IS.”
BGP
The Border Gateway Protocol (BGP) is an inter-autonomous system routing protocol. A BGP router
advertises network reachability information to other BGP routers using Transmission Control Protocol
(TCP) as its reliable transport mechanism. The network reachability information includes the destination
network prefix, a list of autonomous systems that needs to be traversed to reach the destination, and the
next-hop router. Reachability information contains additional path attributes such as preference to a
route, origin of the route, community and others. For more information, see Chapter 10, “Configuring
Basic BGP” and Chapter 11, “Configuring Advanced BGP.”
RIP
The Routing Information Protocol (RIP) is a distance-vector protocol that uses a 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. For more information, see
Chapter 12, “Configuring RIP.”
Static Routing
Static routing allows you to enter a fixed route to a destination. This feature is useful for small networks
where the topology is simple. Static routing is also used with other routing protocols to control default
routes and route distribution. For more information, see Chapter 13, “Configuring Static Routing.”
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