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36
DLDP configuration
This chapter includes these topics:
• Overview
•
DLDP configuration task list
•
Displaying and maintaining DLDP
• DLDP configuration examples
• Troubleshooting DLDP
Overview
Background
Unidirectional links occur when one end of a link can receive packets from the other end, but the other
end cannot receive packets sent by the first end. Unidirectional links result in problems such as loops in
an STP-enabled network.
For example, the link between two switches, Switch A and Switch B, is a bidirectional link when they are
connected via a fiber pair, with one fiber used for sending packets from A to B and the other for sending
packets from B to A. This link is a two-way link. If one of the fibers gets broken, the link becomes a
unidirectional link (one-way link).
Unidirectional fiber links fall into the following types.
•
One type occurs when fibers are cross-connected.
• The other type occurs when a fiber is not connected at one end, or when one fiber of a fiber pair
gets broken.
Figure
9 shows a correct fiber connection and the two types of unidirectional fiber connection.