3Com Switch 4800G 24-Port Configuration Manual page 437

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Configuring Split
Horizon and Poison
Reverse
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To do... Use the command...
Configure RIPng timers timers { garbage-collect
garbage-collect-value |
suppress suppress-value |
timeout timeout-value |
update update-value } *
When adjusting RIPng timers, you should consider the network performance and
perform unified configurations on routers running RIPng to avoid unnecessary
network traffic increase or route oscillation.
If both the split horizon and poison reverse are configured, only the poison reverse
function takes effect.
Configure the split horizon
The split horizon function disables a route learned from an interface from being
advertised via the interface to prevent routing loops between neighbors.
Follow these steps to configure the split horizon:
To do...
Enter system view
Enter interface view
Enable the split horizon
function
Generally, you are recommended to enable the split horizon to prevent routing
loops.
Configuring the poison reverse function
The poison reverse function enables a route learned from an interface to be
advertised via the interface. However, the metric of the route is set to 16. That is to
say, the route is unreachable.
Follow these steps to configure poison reverse:
To do...
Enter system view
Enter interface view
Tuning and Optimizing the RIPng Network
Remarks
Optional.
The RIPng timers have the following
defaults:
30 seconds for the update timer
■
180 seconds for the timeout timer
■
120 seconds for the suppress timer
■
120 seconds for the garbage-collect
■
timer
Use the command...
system-view
interface interface-type
interface-number
ripng split-horizon
Use the command...
system-view
interface interface-type
interface-number
437
Remarks
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Optional
Enabled by default
Remarks
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