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Configuring RIP Services
3-3
Sending Split Horizon and Poisoned Reverse Updates
Split horizon and poisoned reverse updating are schemes for controlling the way a
router advertises a route to the neighbor from which it learned the route.
In split horizon updating, a router that sends updates to a neighbor omits routes
that it learned from that neighbor.
In poisoned reverse updating, a router that sends updates to a neighbor includes
routes learned from that neighbor but sets the route metric to infinity.
Sending Triggered Updates
A triggered update is caused by the occurrence of a particular event — in contrast
to an update that occurs at regular intervals.
A RIP router configured to issue triggered updates sends an update for a route
whenever RIP changes the route’s metric. The triggered update contains only the
routes that have changed.
A RIP router that issues triggered updates also sends full updates at regular
intervals.
Site Manager allows you to configure RIP to generate split horizon or poisoned reverse
updates on an interface. For instructions, see the Poisoned Reverse parameter on page
3-12.
Note: Split horizon and poisoned reverse apply to routes learned from any
protocol. For example, with split horizon enabled, RIP will not advertise an
OSPF-learned route over the interface that OSPF determined to be the next
hop for that route. In Router Software Version 5, split horizon applied to routes
learned from RIP only.
Site Manager allows you to configure RIP to generate triggered updates. For instructions,
see the Triggered Updates parameter on page 3-15.
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