Dell FCX624-E Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide 907
53-1002266-01
Chapter
28
Configuring RIP (IPv4)
Table 170 lists the individual Dell PowerConnect switches and the RIP features they support.
RIP overview
Routing Information Protocol (RIP) is an IP route exchange protocol that uses a distance vector (a
number representing a distance) to measure the cost of a given route. The cost is a distance
vector because the cost often is equivalent to the number of router hops between the Layer 3
Switch and the destination network.
A Layer 3 Switch can receive multiple paths to a destination. The software evaluates the paths,
selects the best path, and saves the path in the IP route table as the route to the destination.
Typically, the best path is the path with the fewest hops. A hop is another router through which
packets must travel to reach the destination. If the Layer 3 Switch receives a RIP update from
another router that contains a path with fewer hops than the path stored in the Layer 3 Switch
route table, the Layer 3 Switch replaces the older route with the newer one. The Layer 3 Switch
then includes the new path in the updates it sends to other RIP routers, including Layer 3 Switches.
RIP routers, including the Layer 3 Switch, also can modify a route cost, generally by adding to it, to
bias the selection of a route for a given destination. In this case, the actual number of router hops
may be the same, but the route has an administratively higher cost and is thus less likely to be
used than other, lower-cost routes.
A RIP route can have a maximum cost of 15. Any destination with a higher cost is considered
unreachable. Although limiting to larger networks, the low maximum hop count prevents endless
loops in the network.
Layer 3 Switches support the following RIP versions:
TABLE 170 Supported RIP features
Feature PowerConnect B-Series FCX
RIP V1 and V2 Yes
Route learning and advertising Yes
Route redistribution into RIP Yes
Route metrics Yes
Route loop prevention:
Poison reverse
Split horizon
Yes
RIP route advertisement suppression on
a VRRP or VRRPE backup interface
Yes
Route filters Yes
CPU utilization statistics for RIP Yes