3Com Switch 4800G 24-Port Configuration Manual page 267

Configuring Split
Horizon and Poison
Reverse
Configuring the
Maximum Number of
Load Balanced Routes
Enabling Zero Field
Check on Incoming RIPv1
Messages
n
Based on network performance, you need to make RIP timers of RIP routers
identical to each other to avoid unnecessary traffic or route oscillation.
n
If both split horizon and poison reverse are configured, only the poison reverse
function takes effect.
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...
Enter system view
Enter interface view
Enable split horizon
n
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...
Enter system view
Enter interface view
Enable poison reverse
Follow these steps to configure the maximum number of load balanced routes:
To do...
Enter system view
Enter RIP view
Configure the maximum
number of load balanced
routes
Some fields in the RIPv1 message must be zero. These fields are called zero fields.
You can enable zero field check on received RIPv1 messages. If such a field
contains a non-zero value, the RIPv1 message will not be processed. If you are sure
Configuring RIP Network Optimization
Use the command...
system-view
interface interface-type interface-number
rip split-horizon
Use the command...
system-view
interface interface-type interface-number
rip poison-reverse
Use the command...
system-view
rip [ process-id ]
maximum load-balancing
number
267
Remarks
-
-
Optional
Enabled by default
Remarks
-
-
Required
Disabled by default
Remarks
--
--
Optional
The default maximum number
is 4.