3Com 4800G Series, Configuration Manual

Page: 267 / 1246

Configuring RIP Network Optimization 267
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.
Configuring Split
Horizon and Poison
Reverse
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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:
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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:
Configuring the
Maximum Number of
Load Balanced Routes
Follow these steps to configure the maximum number of load balanced routes:
Enabling Zero Field
Check on Incoming RIPv1
Messages
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
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
To do… Use the command… Remarks
Enter system view system-view -
Enter interface view interface interface-type interface-number -
Enable poison reverse rip poison-reverse Required
Disabled by default
To do… Use the command… Remarks
Enter system view system-view --
Enter RIP view rip [ process-id ] --
Configure the maximum
number of load balanced
routes maximum load-balancing
number
Optional
The default maximum number
is 4.