3Com S7902E, Configuration Manual

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Based on network performance, you need to make RIP timers of RIP routers identical to each other to
avoid unnecessary traffic or route oscillation.
Configuring Split Horizon and Poison Reverse
If both split horizon and poison reverse are configured, only the poison reverse function takes effect.
The split horizon and poison reverse functions can avoid routing loops.
Enabling split horizon
The split horizon function disables an interface from sending routes received from the interface to
prevent routing loops between adjacent routers.
Follow these steps to enable split horizon:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
—
Enable split horizon rip split-horizon
Optional
Enabled by default
Disabling the split horizon function on a point-to-point link does not take effect.
Enabling poison reverse
The poison reverse function allows an interface to advertise the routes received from it, but the metric of
these routes is set to 16, making them unreachable.
Follow these steps to enable poison reverse:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—