RIP Configuration
157
Software Configuration Guide Release 2.10, Revision 1.00
Command
Purpose
Step 1
node
(if-ip)[
name
]#rip split-
horizon
Enables RIP split-horizon processing on interface
name
Example: Enabling RIP Split-Horizon Processing
The following example shows how to enable split horizon on IP interface
wan
on a SmartNode.
SN(cfg)#
context ip router
SN(ctx-ip)[router]#
interface wan
SN(if-ip)[wan]#
rip split-horizon
18.14 Enabling The Poison Reverse Algorithm
Normally, RIP uses a technique called split horizon to avoid routing loops and allow smaller update
packets. This technique specifies that when the router sends a RIP update out a particular network
interface, it should never include routing information acquired over that same interface.
There is a variation of the split horizon technique called "poison reverse" which specifies that all
routes should be included in an update out a particular interface, but that the metric should be set to
infinity for those routes acquired over that interface. Poison reverse updates are then sent to remove
the route and place it in hold-down. One drawback is that routing update packet sizes will be
increased when using poison reverse.
Procedure
To enable the poison reverse algorithm on an interface
Mode
Interface
Command
Purpose
Step 1
node
(if-ip)[
name
]#rip poison-
reverse
Enables the poison reverse algorithm on interface
name
Example: Enabling The Poison Reverse Algorithm
The following example shows how to enable the poison reverse algorithm on IP interface wan on a
SmartNode.
SN(cfg)#
context ip router
SN(ctx-ip)[router]#
interface wan
SN(if-ip)[wan]#
rip poison-reverse
18.15 Enabling Holding Down Aged Routes
Holding down or locking aged routes learned from RIP packets on the specified interface helps, if an
aged route cannot be refreshed to a non-aged status but must be deleted and then relearned.
Enabling this function enhances the stability of the RIP topology in the presence of transients.
Procedure
To enable holding down of aged routes on an interface
Mode
Interface
Summary of Contents for SmartWare Release 2.10
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