Two HP 10500 Series Switches connect on a 10G fiber link. One of the two fibers in the link breaks, and a
broadcast storm occurs. How could a network administrator prevent a problem like this from happening again?
A.
Configure Device Link Detection Protocol (DLDP) on both sides of the link.
B.
Use Rapid Per VLAN Spanning Tree Plus (RPVST+) instead of Multiple Spanning Tree Protocol (MSTP).
C.
Implement sFlow or NetStream on both sides of the link, setting the collector to an Intelligent Management
Center (IMC) server.
D.
Add another 10G link and create a link aggregation group on each switch that includes both links.
Explanation:
* The Device Link Detection Protocol (DLDP) can detect the link status of a fiber cable or twisted pair. Upon
detecting a unidirectional link, DLDP shuts down the faulty port automatically or prompts the user to do so
manually depending on the configuration to avoid forwarding problems.
* As a link layer protocol, DLDP can identify remote devices, detect unidirectional links, and shut down
unreachable ports at the link layer.
/ If both ends of a link are operating normally at the physical layer, DLDP detects whether the link is correctly
connected at the link layer and whether the two ends can exchange packets properly. This is beyond the
capability of the auto-negotiation mechanism at the physical layer.
/ In conjunction with the physical layer auto-negotiation mechanism where physical signals and faults can be
detected, DLDP can detect and shut down physically/logically unidirectional links.
2 DLDP Implementation
DLDP Technology White Paper
http://www.h3c.com/portal/Products___Solutions/Technology/LAN/
Technology_White_Paper/200812/623012_57_0.htm