Avaya Configuring IP Services Manuel d'utilisateur Page 165

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Customizing RIP Services
117356-A Rev. A 6-11
Specifying the Update Mode
RIP can issue routing updates in the following modes:
Poisoned reverse mode (the default)
Split horizon mode
Actual cost mode
Poisoned reverse mode and split horizon mode are schemes for controlling the
way a router advertises a route to the neighbor from which it learned the route.
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.
In split horizon updating, a router that sends updates to a neighbor omits routes
that it learned from that neighbor.
On certain interfaces -- for example, on a frame relay interface that has virtual
connections (VCs) to different routers that are part of the same logical IP subnet --
you may need to advertise all learned routes with the learned cost.
By default, RIP sends poisoned reverse updates. You can use the BCC or Site
Manager to specify a different update mode.
Using the BCC
Navigate to a RIP interface-specific prompt and enter
mode
mode
mode is
poisoned
actual
split
For example, the following command causes RIP to send split-horizon updates on
IP interface 2.2.2.2.
rip/2.2.2.2# mode split
rip/2.2.2.2#
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