ECS4660-28F_Management Guide-R03

C HAPTER 51 | IP Routing Commands
Routing Information Protocol (RIP)
– 1740 –
◆ It is advisable to use a low metric when redistributing routes from
another protocol into RIP. Using a high metric limits the usefulness of
external routes redistributed into RIP. For example, if a metric of 10 is
defined for redistributed routes, these routes can only be advertised to
routers up to 5 hops away, at which point the metric exceeds the
maximum hop count of 15. By defining a low metric of 1, traffic can
follow a imported route the maximum number of hops allowed within a
RIP domain. However, using a low metric can increase the possibility of
routing loops For example, this can occur if there are multiple
redistribution points and the router learns about the same external
network with a better metric from a redistribution point other than that
derived from the original source.
EXAMPLE
This example redistributes routes learned from OSPF and sets the metric
for all external routes imported from OSPF to a value of 3.
Console(config-router)#redistribute ospf metric 3
Console(config-router)#
This example redistributes static routes and sets the metric for all of these
routes to a value of 3.
Console(config-router)#redistribute static metric 3
Console(config-router)#
RELATED COMMANDS
default-metric (1735)
timers basic This command configures the RIP update timer, timeout timer, and
garbage- collection timer. Use the no form to restore the defaults.
SYNTAX
timers basic update timeout garbage
no timers basic
update – Sets the update timer to the specified value.
(Range: 5-2147483647 seconds)
timeout – Sets the timeout timer to the specified value.
(Range: 90-360 seconds)
garbage – Sets the garbage collection timer to the specified value.
(Range: 60-240 seconds)
DEFAULT SETTING
Update: 30 seconds
Timeout: 180 seconds
Garbage collection: 120 seconds