Split-Horizon

Split-Horizon is a feature used in routing and L2 VPN for avoiding loops. When a router in a network with only one data path receives a data packet, it does not send routing information back along the path on which the packet traveled (i.e., to an adjacent router); it only sends the information forward so that there is no possibility of the packet being routed back along the path it originally traveled.The Split-Horizon allows creating two types of port roles:

Uplink Ports
User Ports / Downlink ports

To access Split-Horizon screens, go to Layer 2 Management > Split-Horizon.

Split-Horizon Configuration Settings

Figure 1. Split-Horizon Configuration Settings

Screen Objective	This screen allows the user to configure the Split-Horizon settings.
Navigation	Layer 2 Management > Split-Horizon
Fields	Select—choose system control for which the configuration will be applied. System Control—select the administrative system control status of the split horizon feature. The default option is Shutdown. The list contains: Start—starts Split-Horizon and indicates that memory is allocated for all ports and Split-Horizon should be supported on all ports. Shutdown—shuts down the Split-Horizon feature in the system; all allocated memory must be released. Module Status—select the administrative status of the Split-Horizon feature. The default option is Disable. The list contains: Enable—enables the split horizon feature in the system. Disable—disables the split horizon feature in the system
Buttons	Apply—modifies attributes for the selected entry and saves the changes.