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19 UNICAST ROUTING
This chapter describes how to configure the following unicast routing
protocols:
RIP – Configures Routing Information Protocol.
OVERVIEW
This switch can route unicast traffic to different subnetworks using the
Routing Information Protocol (RIP). It supports RIP and RIP-2 dynamic
routing. These protocols exchange routing information, calculate routing
tables, and can respond to changes in the status or loading of the network.
RIP and RIP-2 Dynamic Routing Protocols
The RIP protocol is the most widely used routing protocol. RIP uses a
distance-vector-based approach to routing. Routes are determined on the
basis of minimizing the distance vector, or hop count, which serves as a
rough estimate of transmission cost. Each router broadcasts its
advertisement every 30 seconds, together with any updates to its routing
table. This allows all routers on the network to learn consistent tables of
next hop links which lead to relevant subnets.
Non-IP Protocol Routing
The switch supports IP routing only. Non-IP protocols such as IPX and
Appletalk cannot be routed by this switch, and will be confined within their
local VLAN group unless bridged by an external router.
To coexist with a network built on multilayer switches, the subnetworks for
non-IP protocols must follow the same logical boundary as that of the IP
subnetworks. A separate multi-protocol router can then be used to link the
subnetworks by connecting to one port from each available VLAN on the
network.
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