Operation Manual – Routing Protocol
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 3
RIP Configuration
3-1
Chapter 3 RIP Configuration
Note:
When running a routing protocol, the Ethernet switch also functions as a router. The
word “router” and the router icons covered in the following text represent routers in
common sense and Ethernet switches running a routing protocol.
3.1 RIP Overview
Routing information protocol (RIP) is a simple interior gateway protocol (IGP) suitable
for small-sized networks.
3.1.1 Basic Concepts
I. RIP
RIP is a distance-vector (D-V) algorithm-based protocol. It exchanges routing
information through UDP packets.
RIP uses hop count (also called routing cost) to measure the distance to a destination
address. In RIP, the hop count from a router to its directly connected network is 0, and
that to a network which can be reached through another router is 1, and so on. To
restrict the time to converge, RIP prescribes that the cost is an integer ranging from 0
and 15. The hop count equal to or exceeding 16 is defined as infinite; that is, the
destination network or host is unreachable.
To improve performance and avoid routing loop, RIP supports split horizon. Besides,
RIP can import routes from other routing protocols.
II. RIP routing database
Each router running RIP manages a routing database, which contains routing entries
to all the reachable destinations in the internetwork. Each routing entry contains the
following information:
z Destination address: IP address of a host or network.
z Next hop address: IP address of an interface on the adjacent router that IP
packets should pass through to reach the destination.
z Interface: Interface on this router, through which IP packets should be forwarded
to reach the destination.
z Cost: Cost for the router to reach the destination.
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