H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 183)

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Configuring split horizon and poison reverse
If both split horizon and poison reverse are configured, only the poison reverse function takes effect.
Enabling split horizon
Split horizon disables RIPng from sending routes through the interface where the routes were learned to
prevent routing loops between adjacent routers. Do not disable it unless you make sure that it is
necessary.
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 ripng split-horizon
Optional
Enabled by default
Enabling poison reverse
Poison reverse allows RIPng to send routes through the interface where the routes were learned, but the
metric of these routes is always set to 16 (unreachable) to avoid routing loops between neighbors.
Follow these steps to configure poison reverse:
To do… Use the command… Remarks
Enter system view system-view ––
Enter interface view
interface interface-type
interface-number
––
Enable poison reverse ripng poison-reverse
Required
Disabled by default
Configuring zero field check on RIPng packets
Some fields in the RIPng packet must be zero, which are called “zero fields”. With zero field check on
RIPng packets enabled, if such a field contains a non-zero value, the entire RIPng packet will be
discarded. If you are sure that all packets are reliable, disable the zero field check to reduce the CPU
processing time.
Follow these steps to configure RIPng zero field check:
To do… Use the command… Remarks
Enter system view system-view ––
Enter RIPng view ripng [ process-id ] ––
Enable the zero field check checkzero
Optional
Enabled by default