3com S7906E Instruccion De Instalación

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1-8 
Configuring Split Horizon and Poison Reverse 
 
 
If both split horizon and poison reverse are configured, only the poison reverse function takes effect. 
 
Configure split horizon 
The split horizon function disables a route learned from an interface from being advertised through the 
same interface to prevent routing loops between neighbors. 
Follow these steps to configure split horizon: 
To do… 
Use the command… 
Remarks 
Enter system view 
system-view 
–– 
Enter interface view 
interface interface-type 
interface-number 
–– 
Enable the split horizon 
function 
ripng split-horizon 
Optional 
Enabled by default  
 
 
Generally, you are recommended to enable split horizon to prevent routing loops. 
 
Configuring the poison reverse function 
The poison reverse function enables a route learned from an interface to be advertised through the 
interface. However, the metric of the route is set to 16. That is to say, the route is unreachable. 
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 the poison reverse 
function 
ripng poison-reverse 
Required 
Disabled by default 
 
Configuring Zero Field Check on RIPng Packets 
Some fields in the RIPng packet must be zero. These fields 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