R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

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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
NOTE:
• In Frame Relay, X.25 and other non-broadcast multi-access (NBMA) networks, split horizon should be
disabled if multiple VCs are configured on the primary and secondary interfaces to ensure route
advertisement.
• Disabling the split horizon function on a point-to-point link does not take effect.
2. 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. This can avoid routing loops between neighbors.
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 —
Enable poison reverse rip poison-reverse
Required
Disabled by default
Configuring the maximum number of load balanced routes
This task allows you to implement load balancing over multiple equal-cost RIP routes.
Follow these steps to configure the maximum number of load balanced routes:
To do… Use the command…
Remarks
Enter system view system-view ––
Enter RIP view
rip [ process-id ] [ vpn-instance
vpn-instance-name ]
––
Configure the maximum number of
load balanced routes
maximum load-balancing number
Optional
Eight by default
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 that all messages are trusty, disable zero field check to save CPU
resources.
This feature does not apply to RIPv2 packets that have no zero fields.